Effect of antioxidants on the shear bond strength of composite resin to enamel following extra-coronal bleaching.

D Nari-Ratih,A Widyastuti

doi:10.4317/jced.55359

Abstract

BackgroundRecently patients need faster treatments, and delaying restoration is not possible following bleaching treatment. The purpose of this study was to determine the effect of antioxidants, namely 10% sodium ascorbate, 10% alpha-tocopherol, 10% green tea and 10% Aloe vera extract on the shear bond strength of composite resin to enamel following extra-coronal bleaching using 40% hydrogen peroxide.Material and MethodsSeventy premolars were randomly assigned into 7 groups of 10 each. Group 1: bleaching treatment and no antioxidants application. Group 2: composite was built-up immediately after bleaching. Group 3: bleached specimens received composite build-up delayed by 2 weeks. Group 4, 5, 6 and 7: bleached specimens received an application of 10% sodium ascorbate, 10% alpha-tocopherol, 10% green tea, and 10% Aloe vera before composite build-up. Specimens were immersed in artificial saliva, stored in an incubator 37°C (24 hours), thermocycling, and tested using a universal testing machine. Data were analyzed by one-way ANOVA and Tukey’s test with 95% level of significance.ResultsBleaching caused significantly reduced shear bond strength (p<0.05), and application of 10% sodium ascorbate, 10% alpha-tocopherol, 10% green tea and 10% Aloe vera produced significantly greater shear bond strength compared to bleached group (P <0.05). However, no significant differences occurred between antioxidant groups (P >0.05).ConclusionsApplication of antioxidants increased the shear bond strength of composite resin to enamel following extra-coronal bleaching using 40% hydrogen peroxide. 10% sodium ascorbate, 10% alpha-tocopherol, 10% green tea and 10% Aloe vera extracts produced the same effect on the shear bond strength of composite resin to enamel following extra-coronal bleaching using 40% hydrogen peroxide. Key words:Antioxidants, shear bond strength, composite resin, extra-coronal bleaching.

Highlights

Increasing interest in esthetic dentistry has resulted in the widespread practice of extra-coronal bleaching or vital bleaching
Other natural products are used for antioxidant agents such as green tea and Aloe vera extracts, which have free radical scavenging ability that are more potent than sodium ascorbate and alpha-tocopherol [15]
No studies have been conducted to compare the effects of sodium ascorbate and alpha-tocopherol to green tea and Aloe vera extracts on the bond strength of bleached enamel

Summary

Introduction

Increasing interest in esthetic dentistry has resulted in the widespread practice of extra-coronal bleaching or vital bleaching. The following null hypotheses were tested in this study: there would be no effect of 10% sodium ascorbate, 10% alpha-tocopherol, 10% green tea, and 10% Aloe vera extracts on the shear bond strength of composite resin restoration to enamel following extra-coronal bleaching. The purpose of this study was to determine the effect of antioxidants, namely 10% sodium ascorbate, 10% alpha-tocopherol, 10% green tea and 10% Aloe vera extract on the shear bond strength of composite resin to enamel following extra-coronal bleaching using 40% hydrogen peroxide. 10% sodium ascorbate, 10% alpha-tocopherol, 10% green tea and 10% Aloe vera extracts produced the same effect on the shear bond strength of composite resin to enamel following extra-coronal bleaching using 40% hydrogen peroxide Conclusions: Application of antioxidants increased the shear bond strength of composite resin to enamel following extra-coronal bleaching using 40% hydrogen peroxide. 10% sodium ascorbate, 10% alpha-tocopherol, 10% green tea and 10% Aloe vera extracts produced the same effect on the shear bond strength of composite resin to enamel following extra-coronal bleaching using 40% hydrogen peroxide

Objectives

Methods

Findings

Conclusion