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592 results on '"Loguercio AD"'

1. The Effect of Viscosity and Application Mode of Phosphoric Acid on Bond Strength of GlassFiber Post

Author

Costa Scholz MF, Aboud Matos de Almeida R, Scholz N, Gomes GM, Masson-P MJ, Loguercio AD, Reis A, and Bandéca MC

Subjects
fiberglass reinforced polymer, acid etching, post and core technique, Dentistry, RK1-715
Abstract

Maria Fernanda Costa Scholz,1 Rossana Aboud Matos de Almeida,2 Nelson Scholz,1 Giovana M Gomes,1 María José Masson-P,1 Alessandro D Loguercio,1,3 Alessandra Reis,1 Matheus C Bandéca2 1Department of Restorative Dentistry, State University of Ponta Grossa, Paraná, Brazil; 2The Post-Graduation Program in Dentistry, CEUMA University, São Luis, Maranhão, Brazil; 3Faculdad de Ciencias de la Salud Eugenio Espejo, Universidad UTE, Quito, EquadorCorrespondence: Matheus C BandécaPost-Graduation Program in Dentistry, CEUMA University, Josue Montello, São Luis, Maranhão 65075-120, BrazilTel +55 98 982232998Email matheus.bandeca@gmail.comBackground: When a phosphoric acid is used, before applying an adhesive system, it is known that obtaining an effective adhesion to the root canal walls is a challenge. The aim of the present study was to evaluate the influence of phosphoric acid viscosity and application mode on the push-out bond strength (BS) values of fiberglass post to root dentin. The conditioning pattern on the root dentin was also evaluated.Materials and Methods: The roots of 44 endodontically treated premolars were divided into 4 groups, of eleven teeth each, according to the combination of the main factors: phosphoric acid viscosity (liquid or gel) and application mode (passive or sonic). After application of the two-step etch-and-rinse adhesive system, the fiberglass posts were cemented with a dual-cure resin-cement. Roots were sectioned transversely into six 1-mm slices for push-out BS test at 0.5 mm/min. Some roots of each group were selected for evaluation of the conditioning pattern by scanning electron microscopy. BS results (three-way ANOVA and Tukey’s test) and the conditioning pattern (Kruskal–Wallis test and Mann–Whitney test) were statistically evaluated (α= 0.05).Results: The highest BS value was observed with a liquid phosphoric acid under sonic application mode (p < 0.05), being all other groups similar to one another (p < 0.05). Also, the highest BS value was observed in the cervical third, followed by the medium and the apical thirds (p < 0.05). The sonic application produced better smear layer removal and opening of dentinal tubules for both viscosities (p = 0.015).Conclusion: A better bonding of fiberglass posts to root canals can be achieved when the post spaces are conditioned with a liquid phosphoric acid under sonic application.Keywords: fiberglass reinforced polymer, acid etching, post and core technique

Published
2020

2. Effects of Exposure to Cola-Based Soft Drink on Bleaching Effectiveness and Tooth Sensitivity of In-Office Bleaching: A Blind Clinical Trial

Author

Hass V, Carvalhal ST, Lima SNL, Viteri-Garcia AA, Maia Filho EM, Bandeca MC, Reis A, Loguercio AD, and Tavarez RRDJ

Subjects
dentin sensitivity, dental bleaching, hydrogen peroxide, cola-based soft drink, carbonated beverages, cola, soda., Dentistry, RK1-715
Abstract

Viviane Hass,1 Stephanye Tavares Carvalhal,2 Suellen Nogueira Linares Lima,2 Andrés Alejandro Viteri-Garcia,3 Etevaldo Matos Maia Filho,2 Matheus Coelho Bandeca,2 Alessandra Reis,4 Alessandro Dourado Loguercio,4 Rudys Rodolfo De Jesus Tavarez2 1Postgraduate Program in Dentistry, UNOPAR-University Northern Parana, Londrina, PR, Brazil; 2Postgraduate Program in Dentistry, University Ceuma, São Luis, Brazil; 3Escuela de la Salud Eugenio Espejo, Universidad UTE, Quito, Ecuador; 4Department of Restorative Dentistry, School of Dentistry, State University of Ponta Grossa, Ponta Grossa, BrazilCorrespondence: Alessandro Dourado LoguercioUniversidade Estadual de Ponta Grossa. Departamento de Odontologia Restauradora, Avenida Carlos Cavalcanti 4748 – Uvaranas, Ponta Grossa 84030-900, PR, BrazilEmail aloguercio@hotmail.comObjective: The purpose of this single-blind (evaluators) and parallel design study was to evaluate whether exposure to a cola-based soft drink during bleaching treatment with 35% hydrogen peroxide (HP) affects color change and bleaching-induced tooth sensitivity.Material and methods: Forty-four patients with central incisors darker than A2 were selected. Participants who did not drink cola-based soft drinks were assigned to the control group (CG), while participants who drank a cola-based soft drink at least twice a day were assigned to the experimental group (EG). For the CG, foods with staining dyes were restricted. For the EG, there was no restriction on food and patients were asked to rinse their mouths with a cola-based soft drink for 30 s, 4 times daily. For both groups, 2 sessions with three 15 min applications of 35% HP were performed. Shade evaluation was assessed via subjective (VITA classical and VITA bleacheguide shade guides) and objective methods (Easyshade spectrophotometer) at baseline, during bleaching (first, second, and third weeks), and post bleaching (1 week and 1 month). Patients recorded their sensitivity perceptions using a numerical rating scale and 0–10 visual analog scales. Variation in shade guide units and the 2 colors (DE) were evaluated with a Student’s t-test (α = 0.05) and Mann–Whitney test (α = 0.05). Absolute risk of tooth sensitivity and intensity of tooth sensitivity were evaluated by a Chi-square test (α=0.05).Results: Effective bleaching was observed for both groups after 30 days, without statistical difference (p > 0.08). There was no significant difference in absolute risk of bleaching-induced tooth sensitivity between the 2 groups (p = 0.74). Higher and significant scores in pain scales were detected for the EG in comparison to the CG (p < 0.05).Conclusion: Even that the cola-based soft drink exposure during in-office bleaching treatments did not affect the bleaching’s effectiveness; patients reported a higher intensity in bleaching-induced tooth sensitivity.Keywords: dentin sensitivity, dental bleaching, hydrogen peroxide, cola-based soft drink, carbonated beverages, cola, soda

Published
2019

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