Low-concentrated nonvital bleaching effect on bond strength of composite resin restorations

Fabiana Gomes Néspoli; Norberti Bernardineli; Roberto Brandão Garcia; Clovis Monteiro Bramante; Etiene Andrade Munhoz; Augusto Bodanezi

doi:10.14295/bds.2016.v19i3.1273

Authors

Fabiana Gomes Néspoli Department of Restorative Dentistry, Endodontics and Dental Materials – Bauru Dental School – Universidade de São Paulo – Bauru – SP – Brazil.
Norberti Bernardineli Department of Restorative Dentistry, Endodontics and Dental Materials – Bauru Dental School – Universidade de São Paulo – Bauru – SP – Brazil.
Roberto Brandão Garcia Department of Restorative Dentistry, Endodontics and Dental Materials – Bauru Dental School – Universidade de São Paulo – Bauru – SP – Brazil.
Clovis Monteiro Bramante Department of Restorative Dentistry, Endodontics and Dental Materials – Bauru Dental School – Universidade de São Paulo – Bauru – SP – Brazil.
Etiene Andrade Munhoz Department of Dentistry – Health Sciences Center – Universidade Federal de Santa Catarina – Florianópolis – SC – Brazil.
Augusto Bodanezi Department of Dentistry – Health Sciences Center – Universidade Federal de Santa Catarina – Florianópolis – SC – Brazil.

DOI:

https://doi.org/10.14295/bds.2016.v19i3.1273

Abstract

Objective: To investigate if short-term dentin bleaching with low-concentrated substances affects the bond strength of immediate resin composite restorations. Material and Methods: The buccal surfaces of fifty molar crowns were ground for dentin exposure and randomly assigned into 5 groups (n=10), according to the following treatments: sodium perborate + water; sodium perborate + 6% hydrogen peroxide; 6% hydrogen peroxide; 35% hydrogen peroxide (positive control), or no bleaching agent (negative control). The specimens were immediately restored with resin composite. Seven days after treatments, the shear bond test was performed in a universal test machine at a crosshead speed of 0.5 mm/min. Data were analyzed using ANOVA and Tukey’s HSD test (? = 0.05). Results: The shear bond strength mean values for the negative control group were higher than all experimental and positive control groups (p < 0.000), whose differences were not statistically significant (p > 0.05). Conclusion: Short-term dentin bleaching with sodium perborate+water, 6% hydrogen peroxide, or sodium perborate mixed with 6% hydrogen peroxide reduced the shear bond strength of immediate resin composite restorations.

Keywords

Resins, synthetic; Hydrogen peroxide; Shear strength; Esthetics; Tooth.

Author Biographies

Fabiana Gomes Néspoli, Department of Restorative Dentistry, Endodontics and Dental Materials – Bauru Dental School – Universidade de São Paulo – Bauru – SP – Brazil.

Research assistant, Department of Dentistry, Endodontics and Dental Materials

Norberti Bernardineli, Department of Restorative Dentistry, Endodontics and Dental Materials – Bauru Dental School – Universidade de São Paulo – Bauru – SP – Brazil.

Chairman, Departmente of Dentistry, Endodontics and Dental Materials

Roberto Brandão Garcia, Department of Restorative Dentistry, Endodontics and Dental Materials – Bauru Dental School – Universidade de São Paulo – Bauru – SP – Brazil.

Chairman, Department of Dentistry, Endodontics and Dental Materials

Clovis Monteiro Bramante, Department of Restorative Dentistry, Endodontics and Dental Materials – Bauru Dental School – Universidade de São Paulo – Bauru – SP – Brazil.

Chairman, Department of Dentistry, Endodontics and Dental Materials

Augusto Bodanezi, Department of Dentistry – Health Sciences Center – Universidade Federal de Santa Catarina – Florianópolis – SC – Brazil.

Assistant professor, Department of Dentistry