Effect of caries-affected dentin on one-step universal and multi-step etch-and-rinse adhesives’ bond strength

Clecila Müller,Gabriela Simões Teixeira,Ivo Krejci,Tissiana Bortolotto,Gabriela Cauduro Da Rosa,Alexandre Henrique Susin

doi:10.1590/1807-2577.03917

Clecila Müller, Gabriela Simões Teixeira + Show 4 more

Open Access

https://doi.org/10.1590/1807-2577.03917

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Abstract

Abstract Objective To evaluate the influence of caries-affected dentin on bond strength of a universal one-step and a multi-step etch-and-rinse adhesive system. Material and method Enamel of 60 third human molars with and without caries was removed to expose dentin. The teeth were randomly assigned to six groups: Single Bond Universal (3M ESPE, St. Paul, MN, USA) in etch-and-rinse and in self-etch mode and Prime & Bond NT (Dentsply Co, Konstanz, Germany), all on sound and caries-affected dentin. Smear layer of the 30 sound dentin specimens was standardized by polishing with 600-grit SiC paper under water cooling. Residual infected dentin of the 30 caries-affected specimens was removed with a number 4 CA carbide bur until no caries smooth tissue was detectable by tactile-visual inspection. Cylinders of a light cured composite resin (Filtek Z350 XT, 3M ESPE) were built up using starch tubes and microshear test was performed until failure. The data was analyzed by one-way ANOVA and Tukey’s post hoc test. Result Significant differences in microshear bond strength (μSBS) were observed for the caries-affected groups, but not for sound dentin. The μSBS of Single Bond Universal were not influenced by the application protocol on sound dentin, however they were lower in the caries-affected group with both application protocols. The μSBS for Prime & Bond NT was not influenced by the dentin conditions. Conclusion Caries-affected dentin decrease in bond strength of Single Bond Universal in comparison to sound dentin. The bond strength of Prime & Bond NT was not altered by substrate conditions.

Highlights

MATERIAL AND METHODInterfacial integrity influences the efficacy and longevity of composite resin restorations[1]
The aim of this study was to evaluate the influence of caries‐affected dentin on bond strengths of a multimode and an acetone-based etch-and-rinse adhesive systems by a microshear test
- Group 2: sound dentin and Single Bond Universal applied in self-etch mode;

Summary

MATERIAL AND METHOD

Interfacial integrity influences the efficacy and longevity of composite resin restorations[1]. The researchers and manufacturers have dedicated efforts to obtain adequate hybridization of enamel and dentin introducing modifications on the adhesive systems and protocols through the last years Some of these alterations resulted in better bond performances concerning to hybrid layer formation and mechanical properties[2,3]. Costa et al.[10], showed low resin tags formation with short penetration into demineralized dentin regions and the increasing water content and the more permeable condition of caries-affected dentin are concerns that may compromise bonding quality/stability over time when using hydrophilic adhesives systems[10,11,12]. The aim of this study was to evaluate the influence of caries‐affected dentin on bond strengths of a multimode and an acetone-based etch-and-rinse adhesive systems by a microshear test. - Group 4: caries-affected dentin and Single Bond Universal in etch-and-rinse mode;. - Group 5: caries-affected dentin and Single Bond Universal applied in self-etch mode and;. Means of microshear bond strengths were compared by two‐way ANOVA followed by Tukey’s test at a significance level of 5%

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