RESEARCH ARTICLE


Shear Bond Strength of Two Types of Glass Ionomer to Bleached Dentin: Effect of Delayed Bonding and Antioxidant Agent



Ladan Ranjbar Omrani1, Parastoo Sabouri2, Mehdi Abbasi2, Elham Ahmadi1, *, Maryam Ghavam3
1 Department of Operative Dentistry, Dental Students Scientific Research Center, Tehran University of Medical Sciences, Tehran, Iran
2 Department of Operative Dentistry, School of Dentistry, Tehran University of Medical Siences, Tehran, Iran
3 Department of Dental School, Tehran University of Medical Sciences, Tehran, Iran


© Omrani et al.; Licensee Bentham Open

open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution-Non-Commercial 4.0 International Public License (CC BY-NC 4.0) (https://creativecommons.org/licenses/by-nc/4.0/legalcode), which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.

* Address correspondence to this author at the Dental Research Center, Dental Faculty, Tehran University of Medical Sciences; Ghods Street. Enghelab Ave. Tehran, Iran; Tel: +009888986677; Fax: 009888986688; E-mail: Dr.elham.ahmadi@gmail.com


Abstract

Background:

Studies have shown a reduction in bond strength of composites and glass ionomer to bleached enamel and dentin. Several methods have been proposed to reverse compromised bond strength.

Objective:

The aim of this study was to evaluate the effect of delayed bonding and application of antioxidant agent on the bond strength of reinforced self-cured (Fuji IX) and light-cured glass ionomers (Fuji II LC) to bleached dentin.

Material:

Eighty extracted third molars were randomly divided into 8 groups. Buccal dentin surfaces received different treatments: Two control groups: no treatment + bonding Fuji IX or Fuji II LC. Two immediate bonding groups: bleaching + bonding Fuji IX or Fuji II LC. Two delayed bonding groups: bleaching + 7 days delay + bonding Fuji IX or Fuji II LC. Two sodium ascorbate application groups: Bleaching + application of 10% sodium ascorbate + bonding Fuji IX or Fuji II LC. All samples were tested for shear bond strength. Two-way analysis of variance (ANOVA) was used to compare the mean and standard deviations among groups, followed by the Tukey’s test for significant interaction.

Results:

No statistically significant difference was detected in shear bond strength of Fuji IX to bleached or normal dentin. Although a significant reduction was found shear bond strength values of Fuji II LC to bleached dentin, no significant difference was observed between no bleaching group and those treated with 10% sodium ascorbate or 7 days of delay in bonding for both types of glass ionomer.

Conclusion:

Bleaching had no significant effect on shear bond strength of Fuji IX to dentin; this type of GI can be used immediately after bleaching.

Keywords: Bleaching, Bond Strength, Dentine, Glass ionomer, Antioxidant agent.