Effect of sodium ascorbate on composite resin bond strength to bleached teeth

• Autor(a) principal: Xavier, Ana Claudia Carvalho
• Data de Publicação: 2015
• Outros Autores: Gomes, Ana Paula Martins, Silva, Eduardo Galera da, Assis, Luciane Navarro de Souza e, Pagani, Clóvis
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Revista odonto ciência (Online)
• Texto Completo: https://revistaseletronicas.pucrs.br/ojs/index.php/fo/article/view/14337
• topic: Tooth Bleaching; Hydrogen peroxide; Bond strength.; Clareamento dental; Peróxido de hidrogênio; Resistência de união.; bond strength

Objective: The objective of this study was to evaluate the effect of sodium ascorbate on resin composite bond strength.Methods: Forty human premolars were used, which were divided into 4 groups: C – (control) unbleached teeth submitted to a restorative procedure; S – teeth bleached with 35% hydrogen peroxide and stored in artificial saliva for 48 hours; AS – teeth bleached with 35% hydrogen peroxide and irrigated with a 10% sodium ascorbate solution for 10 minutes; AG – teeth bleached with 35% hydrogen peroxide and immersed in 10% sodium ascorbate for 3 hours. After restoration, the samples were section and microtensile bond strength tests were performed in a universal test machine (Emic) at a speed of 1mm/min. The data were evaluated and submitted to the ANOVA and Tukey statistical tests (5% significance level).Results: Group C presented the highest bond strength value, differing statistically from Groups S and AG, however, without statistical difference in comparison with Group AS.Conclusion: Keeping teeth that have been bleached with 35% hydrogen peroxide in saliva for 48 hours is insufficient to recover bond strength. However, the use of 10% sodium ascorbate for 10 minutes may promote adequate bond strength, allowing immediate restoration of the teeth.