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. 2019 Feb 1;11(2):e126-e132.
doi: 10.4317/jced.55359. eCollection 2019 Feb.

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

Diatri Nari-Ratih  1 , Andina Widyastuti  2
Affiliations

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

Diatri Nari-Ratih et al. J Clin Exp Dent. .

Abstract

Background: Recently 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 methods: Seventy 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.

Results: Bleaching 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).

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. Key words:Antioxidants, shear bond strength, composite resin, extra-coronal bleaching.

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Conflict of interest statement

Conflict of interest statement:There is no conflict of interest regarding this publication.

Figures

Figure 1
Figure 1
The knife edge was loaded at the interface between the composite and enamel surface.
Figure 2
Figure 2
SEM photomicrographs showing adhesive type of failure.
Figure 3
Figure 3
SEM photomicrographs exhibiting mixed failures between adhesive and cohesive types.
See this image and copyright information in PMC

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