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VOLUME 14 , ISSUE 5 ( September-October, 2013 ) > List of Articles

RESEARCH ARTICLE

Antioxidant Agents and Their Effects on Shear Bond Strength of Bleached Enamel

Horieh Moosavi, Fatemeh Maleknejad, Zahra Hoseinipour, Lila Hatami, Mahsa Zeynali

Citation Information : Moosavi H, Maleknejad F, Hoseinipour Z, Hatami L, Zeynali M. Antioxidant Agents and Their Effects on Shear Bond Strength of Bleached Enamel. J Contemp Dent Pract 2013; 14 (5):871-875.

DOI: 10.5005/jp-journals-10024-1418

Published Online: 00-10-2013

Copyright Statement:  Copyright © 2013; Jaypee Brothers Medical Publishers (P) Ltd.


Abstract

Aim

The goal of this study was to find a method to eliminate bond strength reduction after vital bleaching.

Materials and methods

Sixty flat surfaces of enamel central human incisors were prepared by diamond disks. In the first group, the samples immediately bonded to the tooth after bleaching. For the second group, the bleached samples were treated by sodium ascorbate for 1 hours. In the third and fourth groups the treatment was down using a new antioxidant agent for 1 hour and 15 minutes respectively. For the fifth group no bleaching was done. Cylindrical composite resin (Z 100) with a Single Bond adhesive system was bonded to the enamel with a special metal mold. After thermocycling, the samples were loaded at a crosshead speed of 0.5 mm/min. The mode of failures was inspected by the Dino Lite microscope and the microstructure of the debonding surfaces was observed by SEM. Considering normal data, statistical analysis was conducted by ANOVA and Tukey tests (p = 0.05).

Results

The fourth group had maximum (21.82), while the first group had the least (9.0971) shear bond strength. The ANOVA test showed a significant difference among the five groups (p = 0.0002). There was not any significant statistical difference between the three types of debonding (p = 0.165).

Conclusion

The usage of sodium ascorbate or sodium ascorbate with detergent after vital bleaching are effective methods for reducing the damaging effects of bleaching agents on the shear bond strength of composite resin restoration to enamel.

Clinical significance

Using antioxidants is necessary post bleaching and before resin bonding.

How to cite this article

Moosavi H, Maleknejad F, Hoseinipour Z, Hatami L, Zeynali M. Antioxidant Agents and Their Effects on Shear Bond Strength of Bleached Enamel. J Contemp Dent Pract 2013;14(5):871-875.


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