Effect of bleaching with hydrogen peroxide into different concentrations on shear strength of brackets bonded with a resin-modified glass ionomer

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DOI:

https://doi.org/10.20396/bjos.v7i24.8643017

Keywords:

Tooth Bleaching. Orthodontic Brackets. Glass Ionomer Cements. Hydrogen Peroxide

Abstract

The evolution in glass ionomer cements has contributed to the reduction in dental caries in orthodontic patients because of the biological and chemical characteristics of this material; however no studies in the literature have evaluated the effect of bleaching treatment on the bond strength values of resin-modified glass ionomer cements (RMGICs). This study assessed the effect of a 6, 7.5 and 35% hydrogen peroxide bleaching gel on shear bond strength and bond failure site of brackets bonded with a resin-modified glass ionomer (Fuji Ortho LC, GC Europe, Leuven, Belgium). One hundred-fifty bovine mandibular permanent incisors were randomly divided into 10 groups; each group contained 15 teeth. Bleaching treatment was performed immediately at 2 different times before the bonding procedure. One hundred-fifty stainless steel brackets were bonded with the resin-modified glass ionomer. Following, all samples were stored in distilled water for 24 hours and then tested in shear mode on a Instron machine. ANOVA and Tukey’s test showed statistical differences between the groups whose teeth were treated with 7.5% hydrogen peroxide and the control group. However, no statistical differences were found for the other groups (P > 0.05). With respect to adhesive remnant index (ARI), the majority of fractures occurred at the bracket/composite interface. Despite the decreased shear bond strength, the bonding of teeth whitened with different concentrations of hydrogen peroxide was found to be strong enough to resist mechanical and masticatory forces.

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Author Biographies

Matheus Melo Pithon, Federal University of Rio de Janeiro, Rio de Janeiro

Especialista em Ortodontia pela Universidade Federal de Alfenas-Unifal, Mestre e Doutor em Ortodontia pela Universidade Federal do Rio de Janeiro-UFRJ e Pos-doutor em Odontopediatria pela Universidade Federal do Rio de Janeiro - UFRJ. Atualmente é Professor Adjunto da Disciplina de Ortodontia da Universidade Estadual do Sudoeste da Bahia (UESB).

Antônio Carlos de Oliveira Ruellas, Federal University of Rio de Janeiro, Rio de Janeiro

Possui graduação em Odontologia pela Universidade Federal de Alfenas (1989), Mestrado em Odontologia pela Universidade Federal do Rio de Janeiro (1995) e Doutorado em Odontologia pela Universidade Federal do Rio de Janeiro (1999). 

Eduardo Franzotti Sant’anna, Federal University of Rio de Janeiro/Rio de Janeiro

Possui graduação em Odontologia pela Universidade Federal Fluminense (1987-1992), mestrado em Odontologia pela Universidade Federal do Rio de Janeiro - UFRJ (1995-1996) e doutorado em Odontologia pela UFRJ / Rush University Medical Center, Chicago, EUA (2000-2004). Atuou como clínico visitante no Rush Craniofacial Center, Chicago,EUA (2002-2004). 

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Published

2016-09-23

How to Cite

1.
Pithon MM, Ruellas AC de O, Sant’anna EF. Effect of bleaching with hydrogen peroxide into different concentrations on shear strength of brackets bonded with a resin-modified glass ionomer. Braz. J. Oral Sci. [Internet]. 2016 Sep. 23 [cited 2022 Oct. 1];7(24):1483-8. Available from: https://periodicos.sbu.unicamp.br/ojs/index.php/bjos/article/view/8643017

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