Repair bond strength and degradation of glass ionomer cements after mechanical and chemical challenges

Authors

DOI:

https://doi.org/10.20396/bjos.v19i0.8659174

Keywords:

Glass ionomer cement, Materials testing, Shear strength, Solubility, Surface properties

Abstract

Aim: Little is known about the reparability of glass ionomer cements (GICs) after storage in acid environments. The aim of this study was to evaluate the solubility and repairability of GICs immersed in acid solutions and subjected to brushing. Methods: Thirty discs of each GIC (Vitremer, VitroFil LC, VitroFil, and Maxxion R) were divided into three immersion groups: distilled water, Coca-Cola, or hydrochloric acid (HCl), then subjected to brushing. The weight of discs was measured before and after the immersions to determine mass alteration. Each disc was repaired, by adding the same brand of GIC over its surface. After immersing the repaired specimens in same solutions, shear bond strengths using universal testing machine were measured. Two-way ANOVA and Tukey’s test was used (α=0.05). Results: Resin-modified GICs degrade after HCl immersion followed by brushing (p<0.05), while self-cured GICs were negatively affected by all challenges (p<0.05). The challenges decreased the repair strength for VitroFil LC (p<0.05), which had higher repair shear bond strength than the other GICs (p<0.05), exhibiting most cohesive failures. Conclusion: Self-cured GICs degraded when immersed in all acid solutions with brushing while resin-modified GICs only degraded following HCl immersion with brushing. Despite exhibiting the best repair results, VitroFil LC was the only GIC that was influenced by all the acid challenges.

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Author Biographies

Leandro Rahal Mestrener, São Paulo State University

Department of Dental Materials and Prosthodontics, São Paulo State University (UNESP), Araçatuba School of Dentistry, Araçatuba, São Paulo, Brazil

Sandra Rahal Mestrener, São Paulo State University

Department of Restorative Dentistry, São Paulo State University (UNESP), Araçatuba School of Dentistry, Araçatuba, São Paulo, Brazil

Cleidiel Aparecido Araujo Lemos, São Paulo State University

Department of Dental Materials and Prosthodontics, São Paulo State University (UNESP), Araçatuba School of Dentistry, Araçatuba, São Paulo, Brazil

André Luiz Fraga Briso, São Paulo State University

Department of Restorative Dentistry, São Paulo State University (UNESP), Araçatuba School of Dentistry, Araçatuba, São Paulo, Brazil

Renato Herman Sundfeld, São Paulo State University

Department of Restorative Dentistry, São Paulo State University (UNESP), Araçatuba School of Dentistry, Araçatuba, São Paulo, Brazil

Ticiane Cestari Fagundes, São Paulo State University

Department of Restorative Dentistry, São Paulo State University (UNESP), Araçatuba School of Dentistry, Araçatuba, São Paulo, Brazil

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Published

2020-05-06

How to Cite

1.
Mestrener LR, Mestrener SR, Lemos CAA, Briso ALF, Sundfeld RH, Fagundes TC. Repair bond strength and degradation of glass ionomer cements after mechanical and chemical challenges. Braz. J. Oral Sci. [Internet]. 2020May6 [cited 2020Oct.31];190:e201715. Available from: https://periodicos.sbu.unicamp.br/ojs/index.php/bjos/article/view/8659174

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