151 results on '"Freire, Alexandre"'
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2. Chronic exposure to lead acetate promotes changes in the alveolar bone of rats: microstructural and physical–chemical characterization
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Davis, Lodinikki Lemoy, Aragão, Walessa Alana Bragança, de Oliveira Lopes, Géssica, Eiró, Luciana Guimaraes, Freire, Alexandre Rodrigues, Prado, Felippe Bevilacqua, Rossi, Ana Cláudia, da Silva Cruz, Allan, das Graças Fernandes Dantas, Kelly, Albuquerque, Alan Rodrigo Leal, Paz, Simone Patricia Aranha, Angélica, Rômulo Simões, and Lima, Rafael Rodrigues
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- 2022
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3. Effects of premature contact in maxillary alveolar bone in rats: relationship between experimental analyses and a micro scale FEA computational simulation study
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Rossi, Ana Cláudia, Freire, Alexandre Rodrigues, Ferreira, Beatriz Carmona, Faverani, Leonardo Perez, Okamoto, Roberta, and Prado, Felippe Bevilacqua
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- 2021
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4. Finite element analysis dynamic simulation of projectile impact caliber.40 S&W in temporal bone with neural tissue.
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Teixeira Costa, Sárah, Rodrigues Freire, Alexandre, Ferreira-Pileggi, Beatriz Carmona, Daruge Júnior, Eduardo, Bevilacqua Prado, Felippe, and Rossi, Ana Cláudia
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NERVE tissue , *FINITE element method , *DYNAMIC simulation , *GUNSHOT wounds , *STRESS concentration - Abstract
Temporal bone is often hit by projectiles. Temporal gunshot wounds must be deeply evaluated to establish wound morphology and stress distribution. Finite element analysis (FEA) is a promising tool that can support forensic aspects. A three-dimensional finite element model of a dry skull filled with neural soft tissue and a projectile.40 calibre S&W were obtained. Two situations were simulated: shot angle fired at 90° with and without neural soft tissue. The results exhibit different morphologies in bony entrance wounds as well as the strong influence of soft tissue. There was good reproducibility between bone and neural tissue real behaviour, and the finite element model that was built. In conclusion, the presence of neural soft tissue cannot be neglected in gunshot wounds, since it does alter results. [ABSTRACT FROM AUTHOR]
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- 2024
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5. Craniofacial injuries by firearms projectiles: An analysis of 868 deaths in the five regions of Brazil
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Castro-Espicalsky, Talita Lima, Costa, Sarah Teixeira, Santiago, Bianca Marques, Freire, Alexandre Rodrigues, Daruge Júnior, Eduardo, Prado, Felippe Bevilacqua, and Rossi, Ana Cláudia
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- 2020
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6. Resorptive potential of impacted mandibular third molars: 3D simulation by finite element analysis
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Oenning, Anne Caroline, Freire, Alexandre Rodrigues, Rossi, Ana Cláudia, Prado, Felippe Bevilacqua, Caria, Paulo Henrique Ferreira, Correr-Sobrinho, Lourenço, and Haiter-Neto, Francisco
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- 2018
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7. A branch-and-bound algorithm for the maximum capture problem with random utilities
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Freire, Alexandre S., Moreno, Eduardo, and Yushimito, Wilfredo F.
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- 2016
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8. Raloxifene but not alendronate can compensate the impaired osseointegration in osteoporotic rats
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Faverani, Leonardo Perez, Polo, Tárik Ocon Braga, Ramalho-Ferreira, Gabriel, Momesso, Gustavo Antonio Correa, Hassumi, Jaqueline Suemi, Rossi, Ana Cláudia, Freire, Alexandre Rodrigues, Prado, Felippe Bevilacqua, Luvizuto, Eloá Rodrigues, Gruber, Reinhard, and Okamoto, Roberta
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- 2017
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9. Morphometric and histologic characterization of alveolar bone from hypertensive patients
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Fabris, André Luís da Silva, Mulinari‐Santos, Gabriel, Hassumi, Jaqueline Suemi, Freire, Alexandre Rodrigues, Faverani, Leonardo Perez, Gruber, Reinhard, and Okamoto, Roberta
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- 2017
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10. The convex recoloring problem: polyhedra, facets and computational experiments
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Campêlo, Manoel, Freire, Alexandre S., Lima, Karla R., Moura, Phablo F. S., and Wakabayashi, Yoshiko
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- 2016
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11. The Role of Family in Vocational Education and Training Choices: A Case Study in Vietnam
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Dormeier Freire, Alexandre and Giang, Hong Trinh
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This article examines the role of family in vocational education and training (VET) choices, using primary qualitative data collected in the commune of Hung An, Vietnam. The authors demonstrate that, next to issues relating to income, it is family characteristics that are the predominant influence on an individual's choice of the VET track, usually portrayed as the "choice of the poor". The article seeks to investigate family educational roles in an Asian Confucian context in transition, such as Vietnam. To understand the role of family in VET choices, the analytical framework looks at the interactions between children and family by combining the level of familial control over children's choices with the family's degree of "openness", that is, their ability to mobilise external social resources. Findings on control and "openness" show that choosing VET is primarily related to the aspirations of children to become emancipated more rapidly, and to familial educational history and background. Families also see investment in VET as a minor risk and a reinforcement of their social status. The data interpretation shows that VET students are more autonomous in their educational decisions and rely more on peers, in part because their parents and family struggle to mobilise the social resources needed to make the "right" educational choice for their children. (Contains 3 tables and 1 note.)
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- 2012
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12. Compact buried pipes system analysis for indoor air conditioning
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de Jesus Freire, Alexandre, Coelho Alexandre, José Luís, Bruno Silva, Valter, Dinis Couto, Nuno, and Rouboa, Abel
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- 2013
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13. Computational Approach to Identify Different Injuries by Firearms†
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Costa, Sarah Teixeira, Freire, Alexandre Rodrigues, Matoso, Rodrigo Ivo, Daruge Júnior, Eduardo, Rossi, Ana Cláudia, and Prado, Felippe Bevilacqua
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- 2017
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14. Orbital aperture morphometry in Brazilian population by postero-anterior Caldwell radiographs
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Rossi, Ana Cláudia, de Souza Azevedo, Flávio Humberto, Freire, Alexandre Rodrigues, Groppo, Francisco Carlos, Júnior, Eduardo Daruge, Ferreira Caria, Paulo Henrique, and Prado, Felippe Bevilacqua
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- 2012
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15. Morphological Variation of the Left Lung: Presence of an Accessory Lobe.
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Gualberto Junqueira, José Ari, Oguma Watanabe, Luciane Naomi, Carmona Ferreira-Pileggi, Beatriz, Cláudia Rossi, Ana, Roberto Botacin, Paulo, Bevilacqua Prado, Felippe, and Rodrigues Freire, Alexandre
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HUMAN dissection ,TRANSPLANTATION of organs, tissues, etc. ,HUMAN body ,LUNG transplantation ,LUNGS ,ANATOMICAL variation - Abstract
Introduction: the lungs are organs that supply gas exchange, existing in both sides of the human body. The left lung has an oblique fissure separating the superior lobe from the inferior lobe, whereas the right lung has horizontal and oblique fissures separating it into superior, middle and inferior lobes. Anatomical variations may occur in the lungs and the left lung can have three lobes and the right lung can have four or only two lobes. The aim of this study was to report a case of a cadaver with an anatomic variation of the left lung with an accessory lobe. Case report: during a routine Anatomy dissection of a female adult cadaver, a three-lobed left lung was found. The left lung had an upper lobe, a middle lobe and a lower lobe. The upper and middle lobes were separated by a complete horizontal fissure. The middle and lower lobes were separated by a complete fissure with an oblique appearance (inferior to superior direction). Conclusion: pneumatologists and surgeons must be aware of the lung anatomical variations. This knowledge can make the surgeon more prepared for adverse situations and may decrease the occurrence of intraoperative difficulties and post-surgery complications when performing lung transplantation or surgical management of lung pathology, lobectomies and segmental resection and for interpreting computed tomography scans. [ABSTRACT FROM AUTHOR]
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- 2023
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16. The hypoglossus nerve (XII cranial nerve pair): anatomical considerations and complications after injuries - a literature review.
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Celestrin de Toledo, Felipe, Carmona Ferreira-Pileggi, Beatriz, Rodrigues Freire, Alexandre, Bevilacqua Prado, Felippe, and Cláudia Rossi, Ana
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LITERATURE reviews ,INJURY complications ,CRANIAL nerves ,HYPOGLOSSAL nerve ,NEUROANATOMY ,CRANIAL nerve diseases - Abstract
Introduction: The hypoglossal nerve (XII cranial nerve) is the tongue's motor supply. The hypoglossal nerve trajectory can be separated into two main parts: intracranial and extracranial. Objective: Considering the rarity of hypoglossus nerve injury, and that when it occurs it results in clinical implications that should be known by the Medical and Dentistry professionals, the aim of this study was to carry out a literature review on the anatomy of the hypoglossal nerve and possible causes of injuries and ways to treat this type of complication. Material and methods: A literature review was carried out in the international Pubmed database. The literature review included 19 articles from 1965 to 2021. The keywords used were: "hypoglossus nerve", "injury". Of the 19 articles, 10 were used for this literature review. Among the 9 articles that were discarded, 5 did not address the objective of this work and 4 did not present the available text. All types of articles were considered (1 literature review, 6 case reports and 3 original articles). Conclusion: The knowledge of the hypoglossal nerve anatomy is for surgical interventions, partial resections, and tongue reconstructions. The causes listed in the present literature review are intubation, the covid-19, procedures performed in the carotid area and occipital condyle fracture. In relation to treatment approaches, no specific protocol has been invented until now. [ABSTRACT FROM AUTHOR]
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- 2023
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17. Case report of an anatomic variation of the buccal nerve (branch of Trigeminal Nerve - V3)
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Ferreira, Beatriz C., Freire, Alexandre R., Junqueira, José A.G. [UNESP], Botacin, Paulo R. [UNESP], Prado, Felippe B., Rossi, Ana C., Universidade Estadual de Campinas (UNICAMP), and Universidade Estadual Paulista (UNESP)
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Clinical Anatomy ,Anatomic variation ,Macroscopic human anatomy ,Buccal nerve - Abstract
Made available in DSpace on 2022-04-29T08:31:16Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-07-01 One of the branches of the mandibular nerve is the buccal nerve. It is responsible for sensory innervating of the buccal gingiva of the lower teeth and the buccal mucosa of the cheek. The aim of this study was to report a case of a cadaver with an anatomic variation of the buccal nerve (branch of Trigeminal Nerve - V3). During a routine Anatomy class, from the observation of a 43-year-old female cadaver head, a unilateral (left side) communicating branch between the buccal branch of the trigeminal nerve and the inferior alveolar nerve was found. The knowledge of anatomical variations is essential to avoid errors and to give the patient adequate clinical management during specific dental and surgical procedures in each case. Department of Biosciences Anatomy Division Piracicaba Dental School University of Campinas Department Basic Sciences Araçatuba Dental School Paulista State University Department Basic Sciences Araçatuba Dental School Paulista State University
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- 2021
18. Similarity Analysis between Contour Lines by Remotely Piloted Aircraft and Topography Using Hausdorff Distance: Application on Contour Planting.
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Freire, Alexandre Araujo Ribeiro, Antunes, Mauro Antonio Homem, de Barros, Murilo Machado, de Souza, Wagner Dias, de Sousa da Silva, Wesley, and de Souza, Thaís Machado
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DRONE aircraft , *DIGITAL elevation models , *SOIL degradation , *TOPOGRAPHY , *PLANTING - Abstract
Contour planting minimizes soil degradation, making agricultural production more sustainable. Currently, geotechnologies can provide more precise and fast data from relief than rudimentary data acquisition for agricultural management. Thus, the objective of this work was to analyze the similarities between contour lines from topography and Remotely Piloted Aircraft, using the Hausdorff distance algorithm. This study was carried out in the period between January 2020 and November 2021 in four localities in the State of Rio de Janeiro, Brazil: two areas located in the municipality of Bom Jardim and two areas in the municipality of Seropédica. Data were acquired through a conventional topographic survey and an aerial photogrammetric survey by Remotely Piloted Aircraft. From the acquired field data for the studied areas, the Digital Elevation Models were generated with a spatial resolution of 0.20 m and the contour lines with an equidistance of one meter. The contour lines obtained by both techniques were superimposed and their similarity was verified using the Hausdorff distance. The results show that there was a better similarity among the contour lines in areas with a very rugged relief than in a smooth relief. Also, the lowest altimetric differences observed in the Digital Elevation Models were associated with the smallest Hausdorff distance. These adjustments correspond, respectively, to the segments between the contour lines with the best and the worst individual similarity for each area. We observed that the similarity between the contour lines from topography and RPA yielded slope differences lower than 6.1% for at least 95% of all studied areas. The Hausdorff distance analysis allowed us to conclude that contour planting can be performed from data obtained via Remotely Piloted Aircraft, provided that vertical accuracy analysis controls the quality of the Digital Elevation Models. [ABSTRACT FROM AUTHOR]
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- 2022
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19. Promises and pitfalls of artificial intelligence for democratic participation: workshop proceedings CCDSEE, GSI, University of Geneva, December 10 – 11, 2020, Virtual Event
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Duberry, Jérôme, Büchi, Moritz, Berryhill, Jamie, Dormeier Freire, Alexandre, Garzia, Diego, et al, and University of Zurich
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digital technologies ,Europe ,Artificial intelligence ,10240 Department of Communication and Media Research ,democracy ,AI ,citizen participation ,political participation ,070 News media, journalism & publishing - Published
- 2020
20. The Existence Problem for Steiner Networks in Strictly Convex Domains
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Freire, Alexandre
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- 2011
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21. Editorial - Revista Thesis Juris.
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Siqueira Freire, Alexandre Reis and Gontijo Vieira, Thiago
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ARTIFICIAL intelligence - Abstract
The given document is an editorial from the Revista Thesis Juris, a legal journal published in São Paulo. The editorial introduces the January to June 2024 edition of the journal, highlighting the diverse perspectives and relevant topics covered in the articles. The edition includes articles on explainable artificial intelligence, freedom of expression on social media, the principle of difference in John Rawls' theory of justice, urban areas and access to public services, the precarization of domestic work in Brazil, and the evolution of plea bargaining in the Brazilian penal system. The editorial expresses gratitude to the authors and readers and hopes that the edition will stimulate enriching reflections and debates in the legal field. [Extracted from the article]
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- 2024
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22. TcArf1: a Trypanosoma cruzi ADP-ribosylation factor
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de Sá-Freire, Alexandre, Nepomuceno-Silva, José Luciano, da Paixão, Júlio César, de Mendonça, Sérgio Maurício, de Melo, Luiz Dione Barbosa, and Lopes, Ulisses Gazos
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- 2003
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23. Validation of anthropological measures of the human femur for sex estimation in Brazilians.
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Cuzzullin, Maria Cláudia, Curate, Francisco, Freire, Alexandre Rodrigues, Costa, Sarah Teixeira, Prado, Felippe Bevilacqua, Daruge Junior, Eduardo, Cunha, Eugénia, and Rossi, Ana Cláudia
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SEXUAL dimorphism ,FEMUR ,ANTHROPOMETRY ,ARCHAEOLOGICAL human remains ,SEX (Biology) ,BRAZILIANS ,PELVIS - Abstract
The femur has been commonly employed for sex determination of human skeletal remains, and it is a suitable alternative to the more sexually dimorphic pelvis when this skeletal region is incomplete or fragmented. The purposes of this study include the evaluation of femoral sexual dimorphism and the generation of specific metric standards for the estimation of sex with the femur in skeletal Brazilian populations. Two hundred femora (130 males and 70 females) of known age at death, sex, and ancestry were used to generate the models for sex prediction. The best estimators of sex were univariable models, including the biomechanical neck length (BNLF, accuracy under cross-validation: 82.5%), the vertical head diameter (VHDL, accuracy under cross-validation: 81.5%), the transverse head diameter (THDF, accuracy under cross-validation: 84.5%), and the epicondylar breadth (EBF, accuracy under cross-validation: 84.5%). In conclusion, a comprehensive anatomical study of the femur in a reference skeletal sample from Brazil was provided, and the value of univariable sex estimators (BNLF, VHDL, THDF and EBF) was established. [ABSTRACT FROM AUTHOR]
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- 2022
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24. Bilateral Double Renal Arteries Variation: a Case Report.
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Ferreira-Pileggi, Beatriz Carmona, de Godoy, Luana Soares, Cruz, Vitoria Daolio, Rossi, Ana Cláudia, Prado, Felippe Bevilacqua, and Freire, Alexandre Rodrigues
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RENAL artery ,VENA cava inferior ,RENOVASCULAR hypertension ,RENAL veins ,TAKAYASU arteritis ,ANATOMICAL variation ,AORTA - Abstract
Introduction: the vascularization of the kidney is given by the renal arteries, a pair of lateral branches from the aorta artery, and each kidney receives blood supply by a single renal artery. The study aimed to report an anatomical variation of the renal arteries. Case report: during a routine Anatomy class, double renal arteries were found bilaterally in a Brazilian adult male cadaver. On the right side, both arteries entered the renal hilum, and the renal vein passed superficially to the inferior branch of the renal artery. On the left side, before entering the renal hilum, the arteries crossed, and the superior branch passed superficially to the inferior branch. Moreover, the renal vein passed superficially to the superior branch before the artery entered the renal hilum and passed posteriorly to the inferior branch before joining the inferior vena cava. Conclusion: the presence of multiple arteries increases the difficulty of surgery procedures. Knowledge of anatomic variations of vessels in the renal hilar is especially important to contribute to the success of surgical invasive and radiological procedures of this area, for adequate surgical planning and to avoid vascular complications. [ABSTRACT FROM AUTHOR]
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- 2022
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25. Symmetry and Correlation Analysis of Mandibular Condyles and Mandibular Rami Landmarks: a Morphometric Study in Dry Human Mandibles.
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da Silva, Matheus Corrêa, Weigel-Gomes, Marcus Vinícius Silva, de Oliveira Neto, Olavo Barbosa, Manoel, Cristiano, Freire, Alexandre Rodrigues, and de Lima, Fernando José Camello
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STATISTICAL correlation ,MANDIBLE ,SYMMETRY ,MANDIBULAR condyle ,MANDIBULAR ramus ,DYNAMOMETER - Abstract
Introduction: the aim os the study was to compare and correlate measures of angles and axes of homolateral and contralateral mandibular condyles and mandibular rami landmarks. Methods and Methods: Linear measures and angles from sixty dry human mandibles of individuals from both sexes, with no distinction regarding ethnicity, were obtained using the software Image J and statistically processed for comparison and correlation analysis. Results: three hundred sixty-four correlations were processed considering all homolateral and contralateral variables and the following was found: 76 (20,88%) correlations presented significant results, none of which with perfect correlation or with absence of correlation; 23 (6,32%) weak correlations (12 positive and 11 negative); 25 (6,87%) moderate correlations (16 positive and 9 negative); 20 (5,49%) strong correlations (10 positive and10 negative); and 08 (2,20%) very strong correlations (04 positive and 04 negative). Significant differences were not found between the right and left sides for measures regarding contralateral mandibular variables. Conclusion: tnalyzed structures presented symmetry and exhibited a positive correlation when there was a plausible synergistical muscle action and a negative correlation when there was a plausible antagonistic action. Future clinical studies with a long follow-up should be considered to assess the role of this muscles on mandibular morphology and on TMDs. [ABSTRACT FROM AUTHOR]
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- 2022
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26. Weak convergence of wave maps from (1+2)-dimensional Minkowski space to Riemannian manifolds
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Freire, Alexandre, Müller, Stefan, and Struwe, Michael
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- 1997
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27. Uniqueness for the harmonic map flow from surfaces to general targets
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Freire, Alexandre
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- 1995
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28. Uniqueness for the harmonic map flow in two dimensions
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Freire, Alexandre
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- 1995
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29. Biomechanical and morphological analysis of Pierre Robin sequence mandible: Finite element and morphometric study.
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Humphries, Laura S., Reid, Russell R., Ross, Callum F., Taylor, Andrea B., Collins, John M., Freire, Alexandre R., Rossi, Ana Cláudia, and Prado, Felippe B.
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- 2021
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30. Incidence of the Anatomical Variations of Mental Foramen in Human Mandibles of a Brazilian Sample.
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Watanabe, Luciane Naomi Oguma, Rodrigues Freire, Alexandre, Haddad, Juliana, Roberto Botacin, Paulo, Bevilacqua Prado, Felippe, and Cláudia Rossi, Ana
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MENTAL foramen , *MANDIBLE , *ANATOMICAL variation , *CHI-squared test , *DESCRIPTIVE statistics , *OPERATIVE surgery , *ANATOMY - Abstract
Introduction: to evaluate the incidence of accessory and double mental foramina in human mandibles from a Brazilian sample. Material and Methods: 100 dried human mandibles (29 females and 71 males) were analyzed, aged 18 to 60 years. The mandibles were evaluated on their right and left sides. The foramens were evaluated being accessory mental foramen or double mental foramen. All data were analyzed using the GraphPAD Prism v.8 software (San Diego, CA, USA). Descriptive statistics (in %) and the chi-square test (X2) were performed to compare the incidence of each foramen between the sexes and the sides. The probability value = 0.05 was defined as the level of significance. Results: of the 71 male mandibles, the incidence was 16.9% for the accessory mental foramen, and 22.53% for the double mental foramen. Of the 29 female mandibles, the incidence was 10.34% for the accessory mental foramen, and 24.13% for the double mental foramen. There were 12% of the accessory mental foramen on the right side and 3% on the left side. And 11% of the double mental foramen on the right side and 12% on the left side. The chi-square test revealed that there was no statistically significant difference for both sex (P value: 0.7066) and for the side (P value: 0.0818). Conclusion: the incidence of accessory and double mental foramen in the studied sample must be considered given the importance of knowledge of the anatomy of these foramina during the execution of anaesthetic and surgical procedures in Dentistry. [ABSTRACT FROM AUTHOR]
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- 2021
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31. Study of the Mandibular Canal as an Indicator for Sexual Dimorphism.
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Carreira Ribeiro, Talita Maximo, Rodrigues Freire, Alexandre, Araujo, Rafael, Teixeira Costa, Sárah, Carmona Ferreira, Beatriz, Daruge Júnior, Eduardo, Bevilacqua Prado, Felippe, and Cláudia Rossi, Ana
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SEXUAL dimorphism , *IMAGE segmentation , *COMPUTED tomography , *SEX differentiation (Embryology) , *REGRESSION analysis - Abstract
Introduction: this study aimed to evaluate the volume of the mandibular canal in computerized tomography and to investigate if this anatomical structure presents sexual dimorphism and the probability to determine the sex from the mandibular canal volume by regression analysis. Methods: Were used 125 computed tomography from adults dried human mandibles selected at random ranging in age from 19 to 100 years (48 females and 77 males). Software Mimics 18.0 was used to image segmentation and to create 3D reconstruction to obtain the volume of the mandibular canal. Statistical tests used were unpaired Wilcoxon-Mann-Whitney comparative test, considering the right and left mandibular canals separately. Regression analysis test was performed to verify the probability to determine the sex. Results showed no significant difference between the sides, p>0,05. Results: The male distribution of the mandibular canal data was not parametric, considering the right canal separately. Mandibular canal volume presented statistical significance for sexual differentiation. Conclusion: Our study presented the accuracy over 85% of the regression analysis show a great result to determined sex using the MC volume, should apply the formula in a different sample for best results. It is useful in forensic scenarios for systematic reassessment of cases and improvement of anthropologic methods used secularly. [ABSTRACT FROM AUTHOR]
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- 2021
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32. Micro-computed Tomography Study of Root Canal Anatomy of Permanent Mandibular Canines.
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Moura Antonialli, Fernanda, Rodrigues Freire, Alexandre, Araujo, Rafael, Teixeira Costa, Sarah, Bevilacqua Prado, Felippe, and Claudia Rossi, Ana
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DENTAL pulp cavities , *CUSPIDS , *HUMAN anatomy , *DECIDUOUS teeth , *TOMOGRAPHY - Abstract
Introduction: root canals morphology knowledge is important in order to achieve success in endodontics treatments. Accessory roots have been reported in mandibular anterior teeth, and it is necessary to improve better and new diagnostic methods, such as micro-CT. The aim of this study was to investigate the internal and external anatomy of human permanent mandibular canine teeth using micro-CT. It was used 50 permanent mandibular canine teeth with complete rhyzogenesis. Deciduous teeth, teeth with deep caries, fractures, incomplete rhyzogenesis and those that presented with obturated root canal were excluded. The samples were scanned in a microtomography (SkyScan 1174, Belgium) by using 50 kV, 800 mA. The thickness of the slices was 6 µm. After three-dimensional reconstruction, the images were transferred to Mimics v. 18 (Materialise, Belgium) for analysis of the internal anatomy of the roots of the mandibular canines. Canines were classified in types I to VIII. The external anatomy of the root was analysed and classified regarding according to the existence or not of the mesial radicular grooves. The R CRAN (WU Wien, TU Dortmund, U Oxford, AT&T Research) software was used for statistical analysis. Descriptive analysis was performed by percentage to verify the most frequent root canal type in the lower canines. The descriptive analysis was performed in the form of a decision tree. The level of significance was <0.05. Three-dimensional reconstruction of the internal anatomy revealed that the most frequent canal was type I (92%), followed by type III (8%). [ABSTRACT FROM AUTHOR]
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- 2021
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33. Alignment of the Facial Foramina in Relation to Midline: 3D-Morphometric Study in a Brazilian Sample.
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Casella Poiani, José Arthur, Haddad, Juliana, de Oliveira Neto, Olavo Barbosa, Carmona Ferreira, Beatriz, Cláudia Rossi, Ana, Bevilacqua Prado, Felippe, and Rodrigues Freire, Alexandre
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MENTAL foramen ,ANATOMICAL planes ,SURFACE plates ,ONE-way analysis of variance ,KRUSKAL-Wallis Test - Abstract
Introduction: the aim of this study was to evaluate the alignment of the supraorbital, infraorbital and mental foramina in relation to the midline according to the sex, the side and the dentition in a sample of CT skulls of a Brazilian sample by 3D morphometric analysis. Methods: A total of 116 CT scans from adults dried human skulls and mandibles were selected at random ranging in age from 19 to 100 years (±57.31), both sexes. Measurements were performed in Rhinoceros 5 software from the median sagittal plane referenced. Continuous outcomes underwent the Shapiro-Wilk's normality test followed by Student's paired t test or Wilcoxon's test to check for differences. To correct the p-value for multiple comparisons, the Tukey's or Dunn's multiple comparisons post-hoc tests were also performed for One-Way ANOVA and Kruskal-Wallis test, respectively. The significance and confidence levels were set, respectively, at 5% and 95%. Results: when the supraorbital, infraorbital, and mental foramina of the same side were compared, a statistically significant result occurred for all comparisons for both sides regarding male and female individuals (p<0.0001). Conclusion: the present work showed in 3-D morphometric analysis that we did not find foramina alignment in any of those studied. [ABSTRACT FROM AUTHOR]
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- 2021
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34. A Novel Classification of the Internal Morphology of Mastoid Emissary Canals and st's Importance for Surgical Practice: an in Silico Anatomical Study.
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de Oliveira-Neto, Olavo Barbosa, Haddad, Juliana, Bevilacqua Prado, Felippe, Cláudia Rossi, Ana, and Rodrigues Freire, Alexandre
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MASTOIDECTOMY ,COMPUTED tomography ,MORPHOLOGY ,OPERATIVE surgery ,CLASSIFICATION - Abstract
Introduction: The aim of the present study was to determine the internal morphology of mastoid emissary canals and to classify them according to the number of external openings and the complexity of its morphology. In addition, we discussed the importance of the findings for surgical procedures performed in the retroauricular region. Materials and Methods: An in silico anatomical study was performed using ninety-six dry human skulls, which were processed by computed tomography (CT) and underwent a segmentation process and construction of three-dimensional surfaces. The criteria used for classification of mastoid emissary canals was based on its morphological complexity and on the number of external openings. Results: Canals were identified and initially classified into 4 groups. Groups were named after the number of external openings using numbers 1, 2, 3, and 4, which refer, respectively, to 1, 2, 3, or 4 foramens. Then, groups were divided into subgroups using up to the first three letters of the alphabet (a, b, and c) according to the morphological complexity of mastoid emissary canals. Finally, 10 types of mastoid emissary canals were established, as follows: 1a, 1b; 2a, 2b, 2c; 3a, 3b, 3c; 4a, 4b. We proposed a decreasing order of canals with potential to cause intracranial intercurrences and a decreasing order of canals with potential to cause moderate to severe hemorrhage. Conclusion: A novel classification regarding the morphology of mastoid emissary canals was presented. In addition to the contributions in anatomical literature, it mainly represents new data to aid surgeons of various areas in the proper knowledge of important anatomical structures and planning of surgical procedures to reduce the occurrence of accidents and complications. [ABSTRACT FROM AUTHOR]
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- 2021
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35. Buccal Fat Pad Anatomy and its Importance for Safe Clinical Procedures: a Review.
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Carmona Ferreira, Beatriz, Oguma Watanabe, Luciane Naomi, Rodrigues Freire, Alexandre, Roberto Botacin, Paulo, Bevilacqua Prado, Felippe, and Cláudia Rossi, Ana
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FAT ,ANATOMY ,WORK structure ,ADIPOSE tissues ,DENTISTRY - Abstract
Introduction: clinical applications of the buccal fat pad have been reported more frequently in recent years, mainly in Dentistry area. The aim of this study was to review the literature identifying the anatomy of the buccal fat pad, including its development, functional importance and some of its applications in different clinical procedures. Review: one electronic research database, PubMed, was investigated using the following restricted keywords: "buccal fat pad", "anatomy" and "clinical procedures". Forty-nine articles were found. The final review included thirty-three of them. Publications identified were considered between February 1989 and December 2020. Conclusion: this review showed that the buccal fat pad is a complex anatomical structure that has essential functions and can be applied to different clinical approaches. It is indispensable for the professionals who work with this structure to know it in detail so to obtain success on the procedures involving the buccal fat pad. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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36. β-catenin and Its Relation to Alveolar Bone Mechanical Deformation – A Study Conducted in Rats With Tooth Extraction.
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Ferreira, Beatriz Carmona, Freire, Alexandre Rodrigues, Araujo, Rafael, Amaral-Silva, Gleyson Kleber do, Okamoto, Roberta, Prado, Felippe Bevilacqua, and Rossi, Ana Cláudia
- Subjects
DEFORMATIONS (Mechanics) ,BONES ,HYOID bone ,TOOTH socket ,DENTAL extraction ,RATTUS norvegicus - Abstract
The aim of this study was to analyze the relationship between alveolar bone deformation and β-catenin expression levels in response to the mechanical load changed by dental extraction in adult rats. Twenty-four male rats (Rattus norvegicus albinus), Wistar linage, at 2 months of age, were used. The right upper incisor tooth was extracted, and euthanasia occurred in periods 5 (n = 6), 7 (n = 6), and 14 (n = 6) days after Day 0. In the control group (n = 6), the dentition was maintained. The euthanasia occurred within 14 days after day 0. After euthanasia, the rats of all groups had their left jaw with tooth removed and separated in the middle. The pieces were undergone routine histological processing and then the immunohistochemical marking were performed to label expression of the primary β-catenin antibody, which was evaluated by qualitative and quantitative analysis. One head by each group (control and experimental) was submitted to computerized microtomography. After the three-dimensional reconstruction of the skull of the rat in each group, the computational simulation for finite elements analysis were performed to simulate a bite in the incisors. In finite element analysis, the strain patterns were evaluated after the application of bite force. The results were analyzed considering the areas in which changes in the amount of deformations were detected. The action of the bite force in the experimental condition, resulted in a uniform distribution of the amount of deformations, in addition to lower amount of deformation areas, differentiating from the control group. Comparing with the control group, the levels of β-catenin signaled in the lingual bone of the middle third of the alveolar bone were raised in the periods of 5 and 14 days. The increased β-catenin positive staining intensity was concentrated on osteocytes and gaps of osteocytes. The findings of the present study were in accordance with our hypothesis that the condition of dental extraction can cause the expression of β-catenin and alter the regimes of bone deformation. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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37. Analysis of the Frontal Sinus Morphology and the Titanium Plates Shape in Skull Fracture for Human Identification
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Prado, Felippe Bevilacqua, Freire, Alexandre Rodrigues, Rondon, Bruna Carolina Santos, Costa, Sarah Teixeira, Rossi, Ana Cláudia, and Daruge Júnior, Eduardo
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forensic anthropology ,radiografía ,antropología forense ,frontal sinus ,radiography ,seno frontal - Abstract
Human identification can be performed by several methods, as anatomical structures of the facial skeletal and individuals signals. The aim of this study was to report a case of human identification from the morphological evaluation of the frontal sinus and the presence of titanium plates in skull after examination of Postero Anterior (PA) radiographs ante and postmortem. In 2008 a skull was found on a highway. Later, an alleged victim was found , who disappeared in late 2007. The skull showed postmortem teeth lost, presence of round hole in the right supra-orbital region, consistent with lesion caused by gunshot. It was also noted the presence of a miniplate of bone fixation in the form of inverted "T" in several locations of the nasal bones and bone remodeling signals in the face. PA radiograph of the skull was performed for the purpose of comparison with the X-rays provided by antemortem family. By overlapping radiographic images, there was similarity between the characteristics presented by the skull and found the alleged victim, as the frontal sinus, shape and height of the orbits, and miniplate fixation of bone with the same shape and size, not leaving no doubt that the radiographs belong to the same individual. La identificación humana puede realizarse por varios métodos, entre ellos a partir de estructuras anatómicas del esqueleto facial y del reconocimiento de señales individuales. El objetivo de este estudio fue reportar un caso de identificación humana mediante la evaluación morfológica del seno frontal y la presencia de placas de titanio en el cráneo después del examen con radiografías posteroanteriores (PA) ante y post mortem. En 2008, se encontró un cráneo en una carretera. Más tarde, se encontró una presunta víctima, que desapareció a finales de 2007. El cráneo mostró dientes perdidos post mortem, la presencia de un orificio redondeado en la región supraorbital derecha, en consonancia con lesiones causadas por arma de fuego. También se observó la presencia de una miniplaca de fijación ósea en forma de "T" invertida en varios lugares de los huesos nasales y señales de remodelación ósea en la cara. La radiografía posteroanterior del cráneo se realizó con el propósito de comparación con los rayos X antemortem proporcionados por la familia. Por superposición de imágenes radiográficas, hubo similitud entre las características que presentó el cráneo y las de la presunta víctima, ya que el seno frontal, la forma y la altura de las órbitas, y la fijación de la miniplaca de hueso presentaron la misma forma y tamaño, no dejando ninguna duda de que las radiografías pertenecían a la misma persona.
- Published
- 2016
38. Methodology to establish mixing zones for outfall discharges in coastal waters
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Ferreira de Lima Freire, Alexandre Augusto, García Gómez, Andrés, Revilla Cortezón, José Antonio, and Universidad de Cantabria
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Aguas costeras ,Zona de mezcla ,Descarga de aguas residuales urbanas ,Water Framework Directive (WFD) ,Mixing zone ,Coastal waters ,Jets and plumes ,Directiva Marco del Agua (DMA) ,Submarine outfall ,Emisario submarino ,Urban wastewater discharge ,Chorros y plumas - Abstract
Wastewaters are often discharged into coastal waters through submarine outfalls. The Water Framework Directive (WFD) establishes a “combined approach”, based on adopting both environmental quality standards (EQS) and emission limit values (ELV), but doesn’t specify where the EQS must be applied, blocking the implementation of this approach. New Directives were adopted to establish the EQS values for the priority substances and the possibility of designing mixing zones (MZ) around the discharge points. Inside these zones noncompliance of one or more EQS is acceptable for any of these substances, if this doesn’t imply a noncompliance of these EQS outside these zones. It is necessary to establish a methodology to quantify and delimitate MZ. A new methodology to establish MZ for outfall discharges into coastal waters is proposed, considering several issues, in an innovative approach, and validated in different outfalls, showing suitability of the MZ and compliance with the EQS values. RESUMEN: Las aguas residuales son a menudo vertidas en la costa a través de emisarios submarinos. La Directiva Marco del Agua (DMA) establece un "enfoque combinado", basado en la adopción de normas de calidad ambiental (NCA) y valores límite de emisión (VLE), pero no especifica dónde se debe aplicar las NCA, impidiendo su implementación. Las directivas que fijan las NCA para las sustancias prioritarias contemplan la posibilidad de establecer zonas de mezcla (ZM) en torno a los puntos de vertido, aceptándose únicamente el incumplimiento de las NCA dentro de dichas zonas. Por ello, se desarrolla una metodología que permite delimitar las ZM para los vertidos de emisarios en aguas costeras, teniendo en cuenta tanto aspectos hidrodinámicos como ambientales de la zona receptora, en un enfoque innovador. La metodología propuesta se valida en diferentes emisarios con vertido en aguas costeras ibéricas, demostrando su idoneidad y sencillez a la hora de su implementación. This research was funded by a “Fundação para a Ciência e a Tecnologia” (Portuguese Ministry of Science, Technology and High Education) PhD Fellowship (SFRH/BD/32452/2006).
- Published
- 2016
39. Computational simulation of projectile injuries to human parietal bone using finite element analysis.
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Rodrigues, Larissa Lopes, Costa, Sarah Teixeira, Rossi, Ana Cláudia, Daruge Júnior, Eduardo, Prado, Felippe Bevilacqua, and Freire, Alexandre Rodrigues
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COMPUTER simulation ,SKULL injuries ,PROJECTILES ,GUNSHOT wounds ,FINITE element method ,BONE mechanics ,SKULL morphology ,ENERGY dissipation - Abstract
The aim of this study was to evaluate the morphological and biomechanical characteristics of a wound entrance on the parietal bone from the impact of projectiles presenting three different calibres. Three-dimensional finite element models of dry human skull and of three projectiles with calibres.380 Auto,.40 S&W and 9 × 19 mm Luger were obtained. These geometries were used to perform a simulation of projectile impact on the parietal bone by the finite element method. We calculated the morphological aspect of the wounds on the external bone surface, the equivalent von Mises stress and the kinetic energy loss. The wounds from the 9 × 19 mm and.380 calibres presented a circular aspect, while the wound from the.40 calibre presented an oval aspect. The 9 × 19 mm caused a major wound area compared with the other calibres. The maximum von Mises stress in the bone was higher from the.40 calibre penetration, and the.380 had the major kinetic energy loss. In conclusion, the 9 × 19 mm and.380 presented similarity in the shape of the entrance hole. The projectile with 9 × 19 mm calibre seems to have greater penetration power and the.40 S&W projectile greater power of destruction and dissipation of energy. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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40. Computer Graphics Applied to Anatomy: A Study of two Bio-CAD Modeling Methods on Finite Element Analysis of Human Edentulous Hemi-Mandible
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Rossi, Ana Cláudia, Freire, Alexandre Rodrigues, Botacin, Paulo Roberto, Caria, Paulo HenriqueFerreira, and Prado, Felippe Bevilacqua
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Mandíbula ,Finite element analysis ,Computational modeling ,Biomechanics ,Análisis de elementos finitos ,Mandible ,Modelización computacional ,Biomecánica - Abstract
Modeling is a step to perform a finite element analysis. Different methods of model construction are reported in literature, as the Bio-CAD modeling. The purpose of this study was to perform a model evaluation and application using two methods of Bio-CAD modeling from human edentulous hemi-mandible on the finite element analysis. From CT scans of dried human skull was reconstructed a stereolithographic model. Two methods of modeling were performed: STL conversion approach (Model 1) associated to STL simplification and reverse engineering approach (Model 2). For finite element analysis was used the action of lateral pterygoid muscle as loading condition to assess total displacement (D), equivalent von-Mises stress (VM) and maximum principal stress (MP). Two models presented differences on the geometry regarding surface number (1834 (model 1); 282 (model 2)). Were observed differences in finite element mesh regarding element number (30428 nodes/16683 elements (model 1); 15801 nodes/8410 elements (model 2). D, VM and MP stress areas presented similar distribution in two models. The values were different regarding maximum and minimum values of D (ranging 00.511 mm (model 1) and 00.544 mm (model 2), VM stress (6.36E-0411.4 MPa (model 1) and 2.15E-0414.7 MPa (model 2) and MP stress (-1.439.14 MPa (model 1) and -1.211.6 MPa (model 2). From two methods of Bio-CAD modeling, the reverse engineering presented better anatomical representation compared to the STL conversion approach. The models presented differences in the finite element mesh, total displacement and stress distribution. El modelado es un paso para llevar a cabo un análisis de elementos finitos. Entre los diferentes métodos de construcción del modelo que se presentan en la literatura, está el modelado Bio-CAD. El propósito de este estudio fue realizar una evaluación del modelo y aplicación utilizando dos métodos de modelado de Bio-CAD desde la hemimandíbula humana edéntula en el análisis de elementos finitos. Desde tomografías computarizadas de cráneos humanos secos, fue reconstruido un modelo de estereolitografía. Se realizaron dos métodos de modelización: enfoque conversión STL (Modelo 1) asociado a simplificación STL y enfoque de ingeniería inversa (Modelo 2). Para el análisis de elementos finitos se utilizó la acción del músculo pterigoideo lateral como condición de carga para evaluar desplazamiento total (D), lo que equivale tensión de von Mises (VM) y la tensión principal máxima (MP). Los dos modelos presentan diferencias en la geometría de la superficie en relación con el número (1834 (modelo 1), 282 (modelo 2)). Se observaron diferencias en la malla de elementos finitos con respecto a número de elemento (30428 nodos/16683 elementos (modelo 1) y 15.801 nodos/8410 elementos (modelo 2)). La D, VM y áreas de tensión MP presentan distribución similar en ambos modelos. Los valores fueron diferentes respecto a los valores máximo y mínimo de D (desde 0 hasta 0,511 mm (modelo 1) y 0 a 0,544 mm (modelo 2), tensión VM (6,36E-04 - 11,4 MPa (modelo 1) y 2,15e-04 - 14,7 MPa (modelo 2) y tensiones MP (-1,43 a 9,14 MPa (modelo 1) y -1,2 a 11,6 MPa (modelo 2)) a partir de dos métodos de modelado de Bio-CAD. La ingeniería inversa presenta una mejor representación anatómica en comparación con el enfoque de conversión STL. Los modelos presentan diferencias en la malla de elementos finitos, el desplazamiento total y la distribución de la tensión.
- Published
- 2014
41. Tooth Loss Related to Root Perforation: Legal Approach in Endodontic Practice
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Caputo, Isamara Geandra Cavalcanti, Rossi, Ana Cláudia, Freire, Alexandre Rodrigues, Bastos, Débora Campanella, Sevillano, Manuel Gustavo Chavez, Júnior, Eduardo Daruge, and Prado, Felippe Bevilacqua
- Subjects
perforación radicular ,accidentes ,tratamiento de endodoncia ,radicular perforation ,accident ,legal odontology ,odontología legal ,endodontic treatment - Abstract
Most of the techniques used in endodontic treatment are limited to the internal space to the tooth, avoiding reaching the periapical region. However, some accidents can happen, such as fracture of endodontic instruments, perforation, leakage of material, tooth fracture among others, depending on the complexityof each case. The aim of this study was to report a case involving a tooth loss caused by root perforation. In this case, the patient filed a lawsuit against the former professional who had performed endodontic treatment requiring compensation for moral and material damages. In conclusion, the practice endodontic the clarification of the risks is crucial, considering the particularities of each case. Thus, it is suggested that the verbal and written information should be offered to patients. La mayoría de las técnicas usadas en el tratamiento de endodoncia son limitadas hacia la cavidad dentinaria pulpar coronal y el canal radicular, evitándose alcanzar la región periapical alveolar. Sin embargo, algunos accidentes pueden ocurrir, tales como: fracturas de instrumentos de endodoncia, perforaciones radiculares, extravasación del material de obturación y fracturas dentarias entre otros. Cada uno involucra una respectiva complejidad. El objetivo de esta publicación fue reportar un caso donde ocurrió la pérdida de un diente permanente causado por una perforación radicular. En este caso la paciente presentó una demanda contra el profesional quién realizó el tratamiento de endodoncia, solicitando una compensación por daños morales y materiales. Se concluye que en la práctica de endodoncia, la especificación de los riesgos es crucial, considerándose las particularidades de cada caso. Así, se sugiere que una buena información verbal y escrita deberá ser proporcionada al paciente.
- Published
- 2014
42. Bone Substitutes used in Dentistry
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Rossi, Ana Cláudia, Freire, Alexandre Rodrigues, Prado, Felippe Bevilacqua, and Caria, Paulo Henrique Ferreira
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odontología ,dentistry ,tissue engineering ,reparación ósea ,ingeniería de tejidos ,bone repair ,biomaterials ,Biomateriales - Abstract
Repair of bone defects resulting from trauma, tumor resections and infections is a medical and dental problem that needs a practical and low cost solution. To facilitate the repair several grafts or bone substitutes may be applied inside the defects. Biomaterials allow treatment, increase or replacement of any tissue, organ or function of the body. The aim of this study was to approach the advantages, disadvantages and main applications of bone substitutes used in reconstruction searched in dental practice. The manuscripts used in this literature review were searched in Medline (PubMed) and Scopus databases and based on manuscripts published from 1991 to 2012. After reading the titles and abstracts of the manuscripts, studies were selected because of their correlations with the aim of the current study. Bone tissue engineering has emerged as a new area of regenerative medicine and biomaterials and has an essential function concerning osteoconductive scaffold, osteogenic growth factors, and osteogenic cells. Based on literature available, a combination of advantageous properties of natural resorbable polymers and bioactive material in nanoscale appears to be more relevant for use in bone defects. La reparación de defectos óseos que resultan de traumas, resección de tumores e infecciones son un problema médico y dental que necesitan una solución práctica y de bajo costo. Para facilitar la reparación, diversos injertos o sustitutos óseos pueden ser aplicados en el interior de los defectos. Los biomateriales permiten tratar, aumentar o sustituir algún tejido, órgano o función del cuerpo. El objetivo de este estudio fue acercarse a las ventajas, desventajas y principales aplicaciones de los sustitutos óseos utilizados para la reconstrucción en la práctica dental. Los manuscritos utilizados en esta revisión sistemática de la literatura se realizaron mediante la búsquedas en Medline (PubMed) y bases de datos Scopus, basada en manuscritos aparecidas entre 1991 y 2012. Después de leer los títulos y resúmenes de los manuscritos, los estudios fueron seleccionados debido a su correlación con el objetivo del presente estudio. Ingeniería de tejido óseo se ha convertido en una nueva área de la medicina regenerativa y biomateriales y tiene una función esencial en relación osteoconductivo andamio, factores de crecimiento osteogénicos, y las células osteogénicas. Basado en la literatura disponible, una combinación de propiedades ventajosas de polímeros reabsorbibles naturales y el material bioactivo en nanoescala que parece ser más relevante para su uso en defectos óseos.
- Published
- 2014
43. iSERVcmb final report – July 2014: The inspection of building services through continuous monitoring and benchmarking – the iSERVcmb project
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Knight, Ian, Konidari, Afroditi, Knight, Andrew, Blatch, Steve, Alexandre, Jose-Luis, Freire, Alexandre, Masoero, Marco, Toniolo, Jacopo, Assimakopoulos, Margarita-Niki, Argyriou, Maria, Wright, Dave, Sheldon, Mark, Butala, Vincenc, Prek, Matjaz, Mandelj, Janez, Andre, Philippe, Lemort, Vincent, Magyar, Zoltan, Davies, Hywel, Mylona, Anastasia, Seppanen, Olli, Derjanecz, Anita, Mair, Oskar, Gruber, Christoph, Hitchin, Roger, and Knight, Ian
- Subjects
TA - Abstract
This is the final overview report for the Intelligent Energy Europe 'iSERVcmb Project' funded by the European Commission between May 2011 and May 2014.
- Published
- 2014
44. Relaciones entre el Canal Mandibular y Clases I, II y III de Angle en Radiografías Panorámicas
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Falkine, Raisa Zago, Rossi, Ana Cláudia, Freire, Alexandre Rodrigues, Figueroba, Sidney Raimundo, Groppo, Francisco Carlos, Caria, Paulo Henrique Ferreira, and Prado, Felippe Bevilacqua
- Subjects
stomatognathic diseases ,stomatognathic system ,Canal mandibular ,Panoramic radiograph ,Radiografía panorámica ,Mandible ,Molars ,Molares ,Mandibula ,Maloclusión ,Mandibular canal ,Malocclusion - Abstract
To prevent injury to the inferior alveolar nerve during dental procedures, knowledge of its anatomical location and course of the mandibular canal is imperative. The aim of this study was evaluate the location on panoramic radiographs of the mandibular canal in relation to the apices of the permanent mandibular molars and base mandible, and relate the type of mandibular canal with Angle classes I, II and III. We evaluated 748 panoramic radiographs distributed according to sex and occlusal class (Angle I, II and III) of fully dentate individuals, 1851 age group. The radiographs were divided according to Angle classes based on cephalometric tracing, clinical data from the medical records of each individual and the analysis of of the maxillar and mandibular dental arches models. The same individuals had the mandibular canal bilaterally assessed, and classified according to their location relative to the root apices of the mandibular molars and mandible base. Measurements of the distance from the mandibular canal to the apices of the teeth and mandible base were made on the Software ImageLab2000®. The intra-observer reproducibility of measurements on radiographs was assessed using the coefficient of variation (p
- Published
- 2014
45. Biomechanics of the Human Canine Pillar Based on its Geometry Using Finite Element Analysis
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Freire, Alexandre Rodrigues, Prado, Felippe Bevilacqua, Rossi, Ana Cláudia, Noritomi, Pedro Yoshito, Neto, Francisco Haiter, and Caria, Paulo Henrique Ferreira
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Cráneo ,Skull ,Finite element analysis ,Biomechanics ,Análisis de elementos finitos ,Biomecánica - Abstract
This study evaluated the stress distribution based on the canine pillar geometry in human skull, using a finite element analysis. Computed tomography of human skull was used to build a finite element model, which was composed by all bony structures of canine pillar: canine eminence, canine fossa, frontal process of maxilla, glabellum and superciliary arch. A support on the bite contact of maxillary canine tooth and a resultant force of the masticatory muscles was applied in the simulation. Equivalent Von-mises and maximum principal stresses were analyzed along the structures that compose the canine pillar geometry. Von-mises stress presented high stress concentrated at the canine fossa and frontal process of maxilla. Maximum principal stress showed compression areas at the canine fossa and part of frontal process and tensile stress at canine eminence and part of the frontal process. In conclusion, the different stress areas means different force concentrations transmitted along the canine pillar geometry during a peak canine bite. Este estudio evaluó la distribución de la tensión sobre la geometría del pilar canino en el cráneo humano, utilizando análisis de elementos finitos. Se usó la tomografía computarizada de cráneo humano para construir un modelo de elementos finitos compuesto por todas las estructuras óseas del pilar canino: eminencia canina, fosa canina, proceso frontal del maxilar, glabela y arco superciliar. Se aplicó en la simulación un soporte ubicado sobre el contacto de mordida del diente canino maxilar y una fuerza resultante de los músculos de la masticación. Tensiones Equivalentes de Von-Mises y tensiones principales máximas fueron analizadas a lo largo de las estructuras que componen la geometría de pilar canino. La tensión de Von-Mises fue alta y concentrada en la fosa canina y proceso frontal del maxilar. La tensión principal máxima mostró áreas de compresión en la fosa canina y parte del proceso frontal y la tensión de tracción en la eminencia canina y parte del proceso frontal. Las diferentes áreas de tensión significan diferentes concentraciones de tensiones transmitida a lo largo de la geometría del pilar canino durante una mordedura canina máxima.
- Published
- 2014
46. Stress Distribution in Human Zygomatic Pillar Using Three-Dimensional Finite Element Analysis
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Prado, Felippe Bevilacqua, Noritomi, Pedro Yoshito, Freire, Alexandre Rodrigues, Rossi, Ana Cláudia, Neto, Francisco Haiter, and Caria, Paulo Henrique Ferreira
- Subjects
Cráneo ,Skull ,Finite element analysis ,Biomechanics ,Análisis de elementos finitos ,Biomecánica - Abstract
This paper aimed to analyze stress distribution in human zygomatic pillar during masseter muscle contraction using three-dimensional finite element analysis. A three-dimensional model and hemi facial skull were produced based on CT-scan data. An adult male skull with structural anatomy integrity was used as model. Muscles forces were applied at origin of elevator muscles and supports was applied at the occlusal surfaces at first and second molars to simulate a masticatory load and stimulate the zygomatic pillar. Supports were applied to the occlusal contacts. Symmetry conditions were placed at the mid-sagittal plane. For the top and back cutting plane, constraints were used. Equivalent Von-Mises Stress and Maximum Principal Stress analysis were performed from the stress fields along the zygomatic pillar. It was represented by stress concentration at the alveolar process, zygomatic bone, frontal and temporal process of zygomatic bone and superciliary arch. Stress line indicates distribution of stress from maxilla toward the frontal and temporal bone. The stresses occurred due to resultant occlusal forces is mainly supported by the zygomatic bone, non-uniformly distributed and predominantly through the zygomatic pillar. This study contributed to better understanding of stress distribution in zygomatic pillar to understand the influence of chewing on zygomatic pillar morphology and also be useful for clinical practice. El objetivo de este artículo fue analizar la distribución de la tensión en el pilar cigomático humano durante la contracción del músculo masetero utilizando análisis de elementos finitos tridimensionales. Un modelo de tres dimensiones de dientes del hemicráneo facial fueron producidos sobre la base de datos de CT-scan. Se utilizó como modelo un cráneo adulto de sexo masculino con la integridad de la anatomía estructural. Fuerzas musculares se aplicaron en el origen de los ascensores de los músculos de la mandíbula y soportes se aplicaron a la superficie oclusal del primer y segundo molar para simular una carga masticatoria y estimular el pilar cigomático. Condiciones de simetría se colocaron en el plano mediano. Se utilizaron restricciones en los planos superior y posterior. El análisis de las tensiones equivalentes von-Mises y máximo director se realizó a través del campo de esfuerzos a lo largo del pilar cigomático. Fue representada la concentración de esfuerzos en el proceso alveolar, hueso cigomático, proceso frontal y temporal del hueso cigomático y el arco superciliar. La línea de tensión indica la distribución de la tensión del maxilar hacia el hueso frontal y temporal. Las tensiones se produjeron debido a las fuerzas oclusales resultantes, que se apoyan principalmente por el hueso cigomático, distribuidas de manera no uniforme y sobre todo a través del pilar cigomático. Este estudio ha contribuido a una mejor comprensión de la distribución de la tensión en el pilar cigomático para entender la influencia de la masticación sobre la morfología de este pilar y ser de utilidad en la práctica clínica.
- Published
- 2013
47. Application and validation of Diagnose Sexuelle Probabiliste V2 tool in a miscegenated population
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Machado, Marcos Paulo Salles, Costa, Sarah Teixeira, Freire, Alexandre Rodrigues, Navega, David, Cunha, Eugénia, Daruge Júnior, Eduardo, Prado, Felippe Bevilacqua, and Rossi, Ana Cláudia
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- 2018
- Full Text
- View/download PDF
48. Extrusión Ortodóncica del Incisivo Central Superior: un Caso Raro de Momificación Pulpar
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Pupo, José Artur Cunha, Rossi, Ana Cláudia, Freire, Alexandre Rodrigues, Caria, Paulo Henrique Ferreira, and Prado, Felippe Bevilacqua
- Subjects
stomatognathic diseases ,stomatognathic system ,ortodoncia extrusión ,movimiento dental ,pulp calcification ,calcificación pulpar ,orthodontic extrusion ,tooth movement ,tooth avulsion ,avulsión dental - Abstract
Due to its anatomical positioning, the central upper incisors are the most affected teeth when related to trauma injuries in the craniofacial region, among with nose traumas. In childhood, traumatic injury is most often caused by bicycle accidents, sports, recreational activities or falls. The aim of this report is to describe a treatment for intrusion of the left maxillary central incisor and the subsequent complications in an 8-year-old boy. Also, the report emphasizes the importance of careful long-term follow-up monitoring intruded permanent teeth. Pulp tissue, as other tissues in the human body, tends to change with traumas. Some of those changes are natural while others occur as result of injuries to the dentin-pulp complex such as caries lesions, periodontal disease, calcifications, as in the present report, or restorative dental procedures. Normally conducted endodontic treatment must take place to obtain maximal results, but only after the re-stabilization of the tooth. Debido a su localización anatómica, los incisivos centrales superiores son los dientes más afectados cuando se refieren a las lesiones traumáticas de la región craneofacial, entre los traumas nasales. En la infancia, lesión traumática suele ser ocasionado por accidentes de bicicleta, deportes, actividades recreativas o caídas. El objetivo de este artículo es describir un tratamiento para la intrusión del incisivo central superior izquierdo y las complicaciones posteriores en un niño de 8 años de edad. Asimismo, el informe hace hincapié en la importancia de cuidado a largo plazo con un seguimiento intrusión dientes permanentes. Tejido de la pulpa, como otros tejidos en el cuerpo humano, tiende a cambiar con traumas. Algunos de estos cambios son naturales, mientras que otros se producen como consecuencia de las lesiones del complejo dentina-pulpa, como las lesiones de caries, enfermedad periodontal, calcificaciones, como en el presente informe, restauración o intervención dental. Tratamiento endodóntico a cabo normalmente deben tener lugar para obtener los máximos resultados, pero sólo después de la re-estabilización del diente.
- Published
- 2013
49. An invariant measure for rational maps
- Author
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Freire, Alexandre, Lopes, Artur, and Mañé, Ricardo
- Published
- 1983
- Full Text
- View/download PDF
50. Emissary Foramens of the Human Skull: Anatomical Characteristics and its Relations with Clinical Neurosurgery
- Author
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Freire, Alexandre Rodrigues, Rossi, Ana Cláudia, de Oliveira, Viviane Cristina Souza, Prado, Felippe Bevilacqua, Caria, Paulo Henrique Ferreira, Botacin, Paulo Roberto, Universidade Estadual de Campinas (UNICAMP), Camilo Castelo Branco University, and Universidade Estadual Paulista (Unesp)
- Subjects
Foramen ,Venas emisarias ,Neurosurgery ,Dura mater ,Emissary foramens ,Neurocirugía ,Duramadre ,Veins - Abstract
The recognition of emissary foramens is important not only for understanding the regional neurovascular anatomy, but also to distinguish normal from potentially abnormal structures. Thus, the aim of this study was to review the literature on anatomical and clinical aspects of the mastoid, parietal and sphenoid emissary foramens. It was found that the emissary foramen presents importance in clinical practice because it acts as a route of spread of extracranial infection to the intracranial structures and also possible complications in neurosurgery, due to its influence in the performance of techniques such as radiofrequency rhizotomy for treatment of trigeminal neuralgia. The anatomical knowledge of the emissary foramens is important due to variability in their incidence in the human skull and its relation to the dura mater sinuses. El reconocimiento de forámenes emisarios es importante no sólo para la comprensión de la anatomía neurovascular regional, sino también para distinguir lo normal a partir de estructuras potencialmente anormales. El objetivo de este estudio fue revisar la literatura sobre los aspectos anatómicos y clínicos del proceso mastoide, huesos parietal y esfenoides y forámenes emisarios. El foramen emisario adquiere importancia en la práctica clínica debido a que actúa como una vía de propagación de la infección extracraneal a las estructuras intracraneales, y también con las posibles complicaciones en neurocirugía, debido a su influencia en el desarrollo de técnicas como rizotomía por radiofrecuencia en el tratamiento de neuralgia del trigémino. El conocimiento anatómico de los forámenes emisarios es importante debido a la variabilidad en su incidencia en el cráneo humano y su relación con los senos de la duramadre.
- Published
- 2013
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