Degree of conversion of resin cements polymerized under different thicknesses of feldspathic porcelain

  • Marcio Leandro Von Dreifus Marinho Araçatuba School of Dentistry, São Paulo State University
  • Thaís Yumi Umeda Suzuki , Faculty of Dentistry, Federal University of Minas Gerais
  • Wirley Gonçalves Assunção Araçatuba School of Dentistry, São Paulo State University
  • João Carlos Silos Moraes Faculty of Ilha Solteira, São Paulo State University
  • Paulo Henrique dos Santos Araçatuba School of Dentistry, São Paulo State University https://orcid.org/0000-0002-4100-5153
Keywords: Ceramics, Polymerization, Resin cements.

Abstract

Aim The aim of this study is to evaluate the degree of conversion (DC) of resin cements polymerized under different thicknesses of feldspathic dental ceramic. Methods: Forty samples of RelyX ARC and RelyX Veneer resin cements were polymerized under Starlight feldspathic ceramic discs (DeguDent Gmbh) with 0.5 mm, 1.2 mm, 1.8 mm, and 2.4 mm in thickness. The control group was cured without the interposition of ceramic. The DC measurements were performed 10 minutes, 1 hour, and 24 hours after the light-activation in a Nexus 670 FTIR spectrophotometer. Data were analyzed by two-way repeated measure ANOVA and Fisher PLSD test. Results: The RelyX ARC showed higher DC for all ceramic thicknesses. There was significant decrease in DC related to an increase in ceramic thickness. For RelyX ARC, the values of DC obtained after 1 hour and 24 hours did not differ statistically between them, but they were higher than those analyzed after 10 minutes. For RelyX Veneer cement, there was gradual increase in the DC up to 24 hours. Conclusion: The higher the thicknesses of ceramic, the lower DC of the resin cement.

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Author Biographies

Marcio Leandro Von Dreifus Marinho, Araçatuba School of Dentistry, São Paulo State University
Department of Dental Materials and Prosthodontic
Thaís Yumi Umeda Suzuki, , Faculty of Dentistry, Federal University of Minas Gerais
Department of Restorative Dentistry
Wirley Gonçalves Assunção, Araçatuba School of Dentistry, São Paulo State University
Department of Dental Materials and Prosthodontic
João Carlos Silos Moraes, Faculty of Ilha Solteira, São Paulo State University
Department of Physics and Chemistry
Paulo Henrique dos Santos, Araçatuba School of Dentistry, São Paulo State University
Department of Dental Materials and Prosthodontic

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Published
2019-04-24
How to Cite
Marinho, M. L. V. D., Suzuki, T. Y. U., Assunção, W. G., Moraes, J. C. S., & Santos, P. H. dos. (2019). Degree of conversion of resin cements polymerized under different thicknesses of feldspathic porcelain. Brazilian Journal of Oral Sciences, 18, e191451. https://doi.org/10.20396/bjos.v18i0.8655288