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Efeito do bicarbonato de sódio na resistência adesiva ao esmalte branqueado
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Advisor(s)
Abstract(s)
Objetivos: Avaliar in vitro o efeito de 10% bicarbonato de sódio na resistência adesiva de resina composta a esmalte branqueado.
Materiais e Métodos: 30 molares hígidos foram divididos em 5 grupos (n=6): controlo, gel placebo e restauração imediata (GC); branqueamento e restauração imediata (G1); branqueamento e restauração após 14 dias (G2); branqueamento e uma aplicação de 10% bicarbonato de sódio de 5 minutos (G3); branqueamento e duas aplicações de 10% bicarbonato de sódio de 5 minutos (G4). O grupos G1, G2, G3 e G4 foram sujeitos a branqueamento com Opalescense PF Regular 16% (Ultradent Products), durante 6 horas por dia, ao longo de 7 dias. Após o branqueamento, as amostras de G1 foram restauradas imediatamente com o sistema adesivo Scotchbond™ Universal (3M ESPE) e a resina composta Filtek™ Z250 (3M ESPE); as amostras G2 foram restauradas após 14 dias; às amostras G3 e G4 foram aplicadas uma solução de 10% bicarbonato de sódio durante 5 minutos e duas aplicações com o mesmo tempo, respetivamente. Após as 24 horas, as amostras foram seccionadas em palitos com secção de 1±0,3mm² de área, segundo os eixos x e y. As amostras foram sujeitas a um teste de microtração a uma velocidade de 0,5mm/min, com recurso a uma máquina de testes universais. A análise estatística foi efetuada através do teste ANOVA com correção de Brown-Forsythe e o teste Post-Hoc de Games-Howell, com p ≤ 0,05 (SPSS28.0).
Resultados: O grupo sujeito a uma aplicação de 10% bicarbonato de sódio (G3) (21 ±12,23 MPa), demostrou valores de resistência adesiva superiores ao do grupo apenas branqueado e restaurado imediatamente (G1) (11,22 ±6,12 MPa) p < 0,001.
Conclusões: A solução de 10% bicarbonato de sódio influencia a resistência adesiva de restaurações em esmalte branqueado.
Objectives: Evaluate in vitro the effect of 10% sodium bicarbonate on the bond strength of composite resin to bleached enamel Methods and Materials: 30 healthy molars were divided into 5 groups: control, placebo gel and immediate restoration (GC); only bleaching and immediate restoration (G1); only bleaching and restoration after 14 days (G2); bleaching and one application of 10% sodium bicarbonate for 5 minutes (G3); bleaching and 2 aplications of 10% sodium bicarbonate for 5 minutes (G4). Groups G1, G2, G3 and G4 were subjected to dental bleaching with Opalescense PF Regular 16% (Ultradent Products) for 7 days, for a daily period of 6 hours. Right after bleaching, the G1 samples were restored immediatly with Scotchbond™ Universal adhesive system (3M ESPE) and Filtek™ Z250 composite resin (3M ESPE); G2 samples were restored after 14 days; to G3 and G4 samples a 10% sodium bicarbonate solution was applied for 5 minutes and 2 applications with the same time, respectively. After 24h, the specimens were sectioned into sticks with a section of 1±0,3mm² área, sectioned according to the x and y axes. The stick specimens underwent a microtensile bond strength test, on a universal testing machine, at a speed of 0,5mm/min. Statistical analysis was performed using ANOVA test with Brown-Forsythe correction and Games-Howell´s Post-Hoc test, with p ≤ 0,05 (SPSS28.0). Results: The group in which 10% sodium bicarbonate was applied for 5 minutes (G3) (21 ±12,23 MPa) demonstrated higher adhesive strength values than the group only whitened and restored right after (G1) (11,22 ±6,12 MPa) p < 0,001. Conclusions: The 10% sodium bicarbonate solution influences the adhesive strength of restorations in bleached enamel.
Objectives: Evaluate in vitro the effect of 10% sodium bicarbonate on the bond strength of composite resin to bleached enamel Methods and Materials: 30 healthy molars were divided into 5 groups: control, placebo gel and immediate restoration (GC); only bleaching and immediate restoration (G1); only bleaching and restoration after 14 days (G2); bleaching and one application of 10% sodium bicarbonate for 5 minutes (G3); bleaching and 2 aplications of 10% sodium bicarbonate for 5 minutes (G4). Groups G1, G2, G3 and G4 were subjected to dental bleaching with Opalescense PF Regular 16% (Ultradent Products) for 7 days, for a daily period of 6 hours. Right after bleaching, the G1 samples were restored immediatly with Scotchbond™ Universal adhesive system (3M ESPE) and Filtek™ Z250 composite resin (3M ESPE); G2 samples were restored after 14 days; to G3 and G4 samples a 10% sodium bicarbonate solution was applied for 5 minutes and 2 applications with the same time, respectively. After 24h, the specimens were sectioned into sticks with a section of 1±0,3mm² área, sectioned according to the x and y axes. The stick specimens underwent a microtensile bond strength test, on a universal testing machine, at a speed of 0,5mm/min. Statistical analysis was performed using ANOVA test with Brown-Forsythe correction and Games-Howell´s Post-Hoc test, with p ≤ 0,05 (SPSS28.0). Results: The group in which 10% sodium bicarbonate was applied for 5 minutes (G3) (21 ±12,23 MPa) demonstrated higher adhesive strength values than the group only whitened and restored right after (G1) (11,22 ±6,12 MPa) p < 0,001. Conclusions: The 10% sodium bicarbonate solution influences the adhesive strength of restorations in bleached enamel.
Description
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Keywords
Branqueamento dentário Esmalte Bicarbonato de sódio Microtração