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Tooth whitening can be considered as one of the simplest, quickest and minimally invasive treatments for the aesthetic improvement of darkened teeth, in addition to presenting a low cost when compared to other restorative aesthetic alternatives...

Made available in DSpace on 2021-06-25T11:06:20Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-05-01 Objectives The aim of this study was to evaluate the frequency of foramen cecum and dens in dente, and to verify the association of these structures in the maxillary lateral incisor (MLI). Materials and Methods The presence of foramen cecum in the lingual surface of 110 MLI was verified, and the teeth were radiographed to observe the presence of dens in dente, being classified according to the literature. An association study between the presence of foramen cecum and dens in dente was performed using the Cramer's V and chi-square statistical tests. Results The association was statistically significant between the foramen cecum and the dens in dente. Concomitant presence was observed in 17.27%, being a high rate when compared with the presence of foramen cecum alone (9.09%) or dens in dente alone (8.18%). In addition, type I (minimal invagination, confined to the crown of the tooth and not extending beyond the level of the cementum-enamel junction) was the most frequent (82.14%). Conclusions We emphasize the importance of alerting the dentist to the presence of a foramen cecum on the lingual surface of the MLI, as it is likely that dens in dente is usually of type I. Thus, the foramen cecum is a sign that can assist the dental surgeon in the discovery of dens in dente and clinical conduct to be taken. Department of Morphology Genetics Orthodontic and Pediatric Dentistry School of Dentistry São Paulo State University (UNESP), Rua Humaitá, 1680 Department of Diagnosis and Surgery School of Dentistry São Paulo State University Department of Morphology Genetics Orthodontic and Pediatric Dentistry School of Dentistry São Paulo State University (UNESP), Rua Humaitá, 1680 Department of Diagnosis and Surgery School of Dentistry São Paulo State University

Made available in DSpace on 2020-12-12T02:15:54Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-07-01 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Resin-modified glass ionomer cement (RMGIC) has important properties. However, like other restorative materials, it has limitations such as decreased biocompatibility. The incorporation of nanoparticles (NP) in the RMGIC resulted in improvements in some of its properties. The aim of this study was to evaluate the physical-biological properties of RMGIC with the addition of nanohydroxyapatite (HANP). Material and Methods: Vitremer RMGIC was used, incorporating HANP by amalgamator, vortex and manual techniques, totaling ten experimental groups. The distribution and dispersion of the HANP were evaluated qualitatively by field emission scanning electron microscope (SEM-FEG). The evaluation of image porosity (SEM-FEG) with the help of imageJ. Cell viability 3-(4,5-dimethylthiazol-2yl)-2,5-diphenyl tetrazoline bromide (MTT) and cell morphology analyses were performed on MDPC-23 odontoblastoid cells at 24 and 72 h. Results: It was possible to observe good dispersion and distribution of HANP in the samples in all experimental groups. The incorporation of 5% HANP into the vortex stirred RMGIC resulted in fewer pores. The increase in the concentration of HANP was directly proportional to the decrease in cytotoxicity. Conclusions: It is concluded that the use of a vortex with the incorporation of 5% HANP is the most appropriate mixing technique when considering the smallest number of pores inside the material. A higher concentration of HANP resulted in better cell viability, suggesting that this association is promising for future studies of new restorative materials. Department of Morphology Genetics Orthodontic and Pediatric Dentistry Araraquara School of Dentistry São Paulo State University (UNESP) Department of Morphology Genetics Orthodontic and Pediatric Dentistry Araraquara School of Dentistry São Paulo State University (UNESP) FAPESP: 2018/02010-7 FAPESP: 2020/06919-0