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Indian J Dent Res. 2019 Jan-Feb;30(1):112-116. doi: 10.4103/ijdr.IJDR_397_17.

Comparative evaluation of effects of natural antioxidants on the shear bond strength of composite resin to bleached enamel.

Author information

1
Department of Conservative Dentistry and Endodontics, Army College of Dental Sciences, Secunderabad, Telangana, India.

Abstract

Context:

The use of antioxidants immediately after bleaching showed increased bond strength.

Aims:

This study aimed to compare the effects of natural antioxidants on the shear bond strength of composite resin to bleached enamel.

Materials and Methods:

Fifty extracted single-rooted upper incisors were decoronated by sectioning the roots 2 mm below the cementoenamel junction, and then, crowns were embedded in autopolymerizing acrylic resin block (3.0 cm × 3.0 cm × 3.0 cm) with the labial surface exposed. They were randomly divided into five groups, depending on the type of antioxidant used (n = 10): (i) Group 1: control (no bleaching), (ii) Group 2: bleaching only, (iii) Group 3: bleaching + 10% sodium ascorbate (antioxidant), (iv) Group 4: bleaching + green tea, and (v) Group 5: bleaching + white tea. Labial surfaces of 40 teeth were bleached with 38% hydrogen peroxide for 20 min following manufacturer's instructions. After that, the experimental groups (Groups 3, 4, and 5) were treated with respective antioxidant solutions before composite restorations were done using a cylindrical plastic mold (3 mm × 5 mm). Shear bond strength of the specimens was tested under universal testing machine.

Statistical Analysis:

Data were analyzed with ANOVA and Tukey's post hoc test.

Results:

There were statistically significant differences between shear bond strength of control groups (Groups 1 and 2) and experimental groups (P < 0.05), but no significant difference in bond strength was observed among the antioxidants used.

Conclusion:

Application of antioxidants immediately after bleaching showed increased bond strength. Green tea and white tea extract can be used as alternative antioxidants in improving the bond strength of enamel.

KEYWORDS:

Antioxidant; bleaching; sodium ascorbate; tea and shear bond strength

PMID:
30900668
DOI:
10.4103/ijdr.IJDR_397_17
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