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.
Highlights
One of the major dental problems affecting people of various ages in dentistry is tooth discoloration especially in endodontically treated teeth [1, 2]
No statistically significant difference was detected in shear bond strength of Fuji IX to bleached or normal dentin
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
Summary
One of the major dental problems affecting people of various ages in dentistry is tooth discoloration especially in endodontically treated teeth [1, 2]. Glass ionomer materials have unique qualities such as; the favorable adhesion to tooth structure, minimal effect on the pulp, suitable for areas that are difficult to isolate, high tissue tolerance and fluoride-releasing [8 - 10]. Due to these characteristics they have a wide range of applications as anterior proximal restoration, cervical restoration especially in areas with little or no enamel margins, and as a base material for composite restoration to reduce polymerization shrinkage and associated stresses in tooth structure as well as the tooth-restoration interface with subsequent problems of marginal leakage, recurrent caries and possible tooth fracture especially in endodontically treated teeth [11 - 13]. Several methods have been proposed to reverse compromised bond strength
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