Restor Dent Endod.  2013 Nov;38(4):241-247.

Effect of Epigallocatechin Gallate on shear bond strength of composite resin to bleached enamel: an in vitro study

• Khamverdi
• Rezaei-Soufi L
• Kasraei S
• Ronasi N
• Rostami S

Abstract

OBJECTIVES
The aim of this study was to determine the effect of epigallocatechin gallate (EGCG) on the shear bond strength of composite resin to bleached enamel.
MATERIALS AND METHODS
Ninety enamel surfaces of maxillary incisors were randomly divided into 9 groups as follows: G1: control (no bleaching); G2: bleaching; G3: bleaching and storage for seven days; G4 - 6: bleaching and application of 600, 800 and 1,000 micromol of EGCG-containing solution for 10 minutes, respectively; G7 - 9: bleaching and application of 600, 800 and 1,000 micromol of EGCG-containing solution for 20 minutes, respectively. The specimens were bleached with 30% hydrogen peroxide gel and a composite resin cylinder was bonded on each specimen using a bonding agent. Shear bond strength of the samples were measured in MPa. Data was analyzed using the two-way ANOVA and Tukey HSD tests (alpha = 0.05).
RESULTS
The maximum and minimum mean shear bond strength values were observed in G1 and G2, respectively. Time and concentration of EGCG showed no significant effects on bond strength of the groups (p > 0.05). Multiple comparison of groups did not reveal any significant differences between the groups except for G2 and all the other groups (p < 0.05).
CONCLUSIONS
There is a significant decrease in bond strength of composite resin to enamel immediately after bleaching. A delay of one week before bonding and the use of EGCG increased bond strength of composite resin to bleached enamel.

Keyword

Antioxidant; Epigallocatechin gallate; Green tea; Shear bond strength; Tooth bleaching

MeSH Terms

Catechin
Dental Enamel*
Hydrogen Peroxide
Incisor
Tooth Bleaching
Catechin
Hydrogen Peroxide

Figure

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  Figure 1 SEM views of the fractured surface in group 2, showing porosities in the resin layer on the bonded enamel surface (P, porosity). (a) ×250; (b) ×5,000.

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  Figure 2 SEM views of the fractured surface in group 1 (control), showing a uniform resin layer on the bonded enamel surface. (a) ×250; (b) ×5,000.

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  Figure 3 SEM views of the fractured surface in group 6, showing a uniform resin layer on the bonded enamel surface. (a) ×250; (b) ×5,000.

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  Figure 4 SEM views of the fractured surface in group 3, showing a uniform resin layer on the bonded enamel surface. (a) ×250; (b) ×5,000.

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