Revista de Odontologia da UNESP
https://revodontolunesp.com.br/journal/rou/article/doi/10.1590/1807-2577.1073
Revista de Odontologia da UNESP
Original Article

Effect of 10% sodium bicarbonate on bond strength of enamel and dentin after bleaching with 38% hydrogen peroxide

Efeito do bicarbonato de sódio a 10% na resistência de união do esmalte e dentina após clareamento com peróxido de hidrogênio a 38%

Darzé, Fernanda Medeiros; Amaral, Flávia Lucisano Botelho do; França, Fabiana Mantovani Gomes; Turssi, Cecilia Pedroso; Basting, Roberta Tarkany

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Abstract

Introduction: By-products of hydrogen peroxide degradation released during dental bleaching influence the polymerization of adhesive systems and composite resins, causing a reduction in shear bond strength to the tooth. Objective: the aim of this article was to evaluate the effect of 10% sodium bicarbonate (SB), applied for different lengths of time, on the shear bond strength to enamel and dentin after bleaching. Material and method: Enamel and dentin blocks were divided into groups (n=10): (1) control: no bleaching; (2) immediate: bleaching immediately followed by restoration; (3) 14-day: bleaching, restoration 14 days later; (4) SB for 10 minutes: bleaching, SB gel for 10 minutes, immediately followed by restoration; (5) SB for 20 minutes: bleaching, SB gel for 20 minutes, immediately followed by restoration. A 38% hydrogen peroxide gel (Opalescence Boost/Ultradent) was used. After application of the adhesive system, composite resin cylinders were mounted on the surface of the substrates in order to test shear bond strength. Result: ANOVA and Tukey tests showed significantly higher mean enamel bond strength values for the 14-day follow-up group and without significant differences for control group. Mean bond strength values obtained for the other groups were intermediate. When testing dentin, the Tukey test revealed a significantly higher mean bond strength value for the 14-day follow-up group when compared with application of SB for 20 minutes. Conclusion: SB gel applied was unable to reverse the low bond strength to enamel and dentin after bleaching treatment.

Keywords

Tooth bleaching, hydrogen peroxide, shear strength, sodium bicarbonate.

Resumo

Introdução: Subprodutos da degradação do peróxido de hidrogênio liberados durante o clareamento dental influenciam a polimerização de sistemas adesivos e resinas compostas, levando à redução da resistência de união à estrutura dental. Objetivo: O objetivo deste trabalho foi avaliar o efeito do bicarbonato de sódio a 10% (BS), aplicado por diferentes períodos de tempo na resistência de união ao esmalte e dentina após o clareamento. Material e método: Blocos de esmalte e dentina de terceiros molares humanos foram separados em grupos (n=10): (1) controle: ausência de clareamento; (2) imediato: clareamento seguido por restauração imediata; (3) 14 dias: clareamento, restauração 14 dias após; (4) BS por 10 minutos: clareamento, gel de BS por 10 minutos, restauração imediata; (5) BS por 20 minutos: clareamento, gel de BS por 20 minutos, restauração imediata. Um gel de peróxido de hidrogênio a 38% (Opalescence Boost/Ultradent) foi utilizado. Após aplicação do sistema adesivo, cilindros de resina composta foram confeccionados na superfície dos substratos para avaliar a resistência por cisalhamento. Resultado: ANOVA e teste de Tukey mostraram valores médios significativamente mais elevados para o grupo “14 dias” e sem diferença significativa do grupo “controle”. Médias de valores para os outros grupos foram intermediárias. Para dentina, o teste de Tukey revelou maiores médias de valores significativos para a resistência de união para o grupo “14 dias” quando comparado à aplicação do BS por 20 minutos. Conclusão: O gel de BS não foi capaz de reverter os baixos valores de resistência de união ao esmalte e dentina após o tratamento clareador.

Palavras-chave

Clareamento dental, peróxido de hidrogênio, resistência ao cisalhamento, bicarbonato de sódio.

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