Revista de Odontologia da UNESP
http://revodontolunesp.com.br/article/doi/10.1590/1807-2577.08818
Revista de Odontologia da UNESP
Original Article

The effect of a bleaching agent on the pigment removal and the bond strength of bulk-fill resin composites: an in vitro study

Efeito dos agentes clareadores na remoção de pigmentos e na resistência de união de resinas compostas bulk-fill: um estudo in vitro

Caroline de Farias CHARAMBA; Renally Bezerra Wanderley LIMA; Sônia Saeger MEIRELES; Rosângela Marques DUARTE; Ana Karina Maciel ANDRADE

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Abstract

Abstract: Introduction: In order to simplify the technique, reduce the time required for direct adhesive restorations, bulk-fill resin composites have been developed be applied in bulk placement up to 4 mm increments.

Objective: Evaluating the color change (ΔE) and the microtensile bond strength (μTBS) of bulk fill resin composites (BFRC) to dentin after the immersion in regular beverages and the application of bleaching systems.

Method: Forty-five human molar teeth were randomly distributed in three groups according to the filling material (n=15): Filtek Bulk Fill, Tetric N Ceram Bulk Fill and Filtek Z100. The restored teeth were immersed in coffee, wine and distilled water (n=5) for 72 hours. The color parameters were measured using a spectrophotometer, having as basis the CIE L*a*b*, before and after tooth staining and application of bleaching processes. Subsequently, the teeth were sectioned to obtain the specimens for the microtensile testing. The ΔE values were analyzed applying the Kruskal-Wallis and the Wilcoxon tests, and the μTBS values were analyzed applying the ANOVA and the Bonferroni tests (p<0.05).

Result: There were no significant differences in the ∆E values when comparing the BFRCs to the conventional resin composite (CRC) in most of the experimental groups. The ∆E values did not present significant differences before and after the application of bleaching processes for all the tested resin composites. The BFRCs presented higher μTBS values than the CRC after exposure to distilled water, wine and bleaching agent.

Conclusion: The studied BFRCs presented similar color stability to the CRC. The BFRCs presented higher bond strength to the dentin than the CTC in most of the evaluated conditions. The bleaching agent was not effective in whitening the stained restored teeth.

Keywords

Composites resin, tooth bleaching, tensile strength

Resumo

Resumo: Introdução: Em busca de simplificar a técnica, reduzir o tempo requerido para as restaurações adesivas, resinas compostas bulk-fill (RCBF) estão sendo desenvolvidas para serem aplicadas em incrementos com espessura de até 4 mm.

Objetivo: Avaliar a alteração de cor (ΔE) e resistência de união (μTBS) de RCBF a dentina após imersão em bebidas e aplicação de um sistema clareador.

Método: Foram utilizados 45 dentes molares humanos que foram distribuídos aleatoriamente em três grupos de acordo com o material restaurador (n=15): Filtek Bulk Fill, Tetric N Ceram Bulk Fill e Filtek Z100. Os dentes restaurados foram imersos em café, vinho e água destilada (n=5) durante 72 horas. Os parâmetros de cor foram mensurados utilizando um espectrofotômetro, tendo como base o CIE L*a*b*, antes e após o manchamento e aplicação dos agentes clareadores. Consequentemente, os dentes foram seccionados para a obtenção de espécimes para o teste de microtração. Os valores de ΔE foram analisados aplicando os testes de Kruskal-Wallis e Wilcoxon e os valores de μTBS foram analisados aplicando ANOVA e o teste de Bonferroni (p<0,05).

Resultado: Não houve diferença significante nos valores de ∆E quando as RCBFs foram comparadas a resina composta convencional (RCC) na maioria dos grupos experimentais. Os valores de ∆E não apresentaram diferença estatística antes e após a aplicação do agente clareador para todas as resinas testadas. As RCBFs demonstraram maiores valores de μTBS comparado a RCC após exposição a água destilada, vinho e agente clareador.

Conclusão: As RCBFs demonstraram uma similar estabilidade de cor quando comparado a RCC. As RCBFs apresentaram maior resistência de união a dentina que a RCC na maioria das condições avaliadas. O agente clareador não foi efetivo no clareamento dos dentes restaurados.
 

Palavras-chave

Resinas compostas, clareamento dental, resistência a tração

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