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Related articles

VOLUME 18 , ISSUE 10 ( October, 2017 ) > List of Articles

RESEARCH ARTICLE

Effect of Two-minute Application of 35% Sodium Ascorbate on Composite Bond Strength following Bleaching

Eman H Ismail, Evren Kilinc, Patrick C Hardigan, James K Rothrock, Jeffrey Y Thompson, Cristina Garcia-Godoy

Citation Information : Ismail EH, Kilinc E, Hardigan PC, Rothrock JK, Thompson JY, Garcia-Godoy C. Effect of Two-minute Application of 35% Sodium Ascorbate on Composite Bond Strength following Bleaching. J Contemp Dent Pract 2017; 18 (10):874-880.

DOI: 10.5005/jp-journals-10024-2142

Published Online: 01-06-2015

Copyright Statement:  Copyright © 2017; The Author(s).


Abstract

Aim

The aim of this study is to assess the effect of 35% sodium ascorbate on microtensile bond strength of dentin immediately after bleaching with 35% hydrogen peroxide.

Materials and methods

A total of 25 sound human 3rd molars were collected. Teeth were randomly divided into five groups for different treatments: Group I [bleaching + immediate bonding (i.e., restoration)], group II (bleaching + delayed bonding), group III (bleaching + sodium ascorbate + immediate bonding), group IV (bleaching + sodium ascorbate + delayed bonding), and group V (bonding only). After bleaching, but before bonding, groups II and IV were stored for 1 week in deionized water at 37°C. All samples were bonded using OptiBoned FL (Kerr) and Filtek Supreme (3M/ESPE). Teeth were sectioned into 1 × 1 mm 2 bars, and microtensile bond strength was tested with a universal testing machine (Instron 8841) at a cross-head speed of 0.5 mm/minute.

Results

Microtensile bond strength differed significantly across the five groups, with a significant reduction in microtensile strength observed for samples in group I relative to samples in any of the other treatment groups (p < 0.05).

Conclusion

The application of a high concentration of sodium ascorbate for a shorter time reversed the negative effect of 35% hydrogen peroxide bleaching on composite bonding strength to dentin.

Clinical significance

The negative effects of bleaching on composite bonding can be neutralized by the application of the reversing agent sodium ascorbate thus, increasing the efficiency of clinic chair time. This is clinically relevant for those patients requiring restorative treatment immediately after inoffice bleaching.

How to cite this article

Ismail EH, Kilinc E, Hardigan PC, Rothrock JK, Thompson JY, Garcia-Godoy C. Effect of Twominute Application of 35% Sodium Ascorbate on Composite Bond Strength following Bleaching. J Contemp Dent Pract 2017;18(10):874-880.

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