Effect of diphenyliodonium hexafluorphosphate in the yellowing and properties of experimental resin cements

Keywords: Resin cements, Physical phenomena, Photoinitiators, dental, Polymers.

Abstract

Aim: The yellowing effect is undesirable and can occur in the dental restoration margins when light-cured resin cements containing camphorquinone as photoinitiator is used. This study aimed to evaluate the effect of diphenyliodonium hexafluorphosphate (DPI) in photoinitiator systems that contained different concentrations of camphorquinone (CQ) and dimethylamino ethyl benzoate (EDAB) on resin cements. Methods: A base (1:1) of bisphenol A diglycidyl methacrylate (BisGMA) and triethylene glycol dimethacrylate (TEGDMA) was obtained, and 60wt% of glass fillers was added. Eight formulations were obtained: RC1 (0.5mol% CQ / 1mol% EDAB), RC2 (0.5mol% CQ / 2mol% EDAB), RC3 (1mol% CQ / 1mol% EDAB), RC4 (1mol% CQ / 2mol% EDAB), and RC5 to RC8, which contained the same bases plus 0.5mol% DPI. Experimental resin cements were evaluated by the degree of conversion (DC), L*a*b* color analysis, water sorption (WS) and solubility (S), flexural strength, and Elastic Modulus. The data were analyzed by three-way ANOVA, Tukey’s and Mann-Whitney tests (α = 0.05). Results: The combination of DPI and 0.5mol% CQ increased DC in RC6 and L* in RC5 without increasing the WS and a* b* values. CQ at 1mol% showed higher values of b* and lower values of a*, except for RC3. Groups with 2mol% EDAB showed higher DC. Conclusion: The addition of DPI reduces CQ, generating a decreased yellowing effect, while maintaining adequate properties in the resin cements, especially with 2mol% EDAB.

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Author Biographies

Kamila Menezes Guedes de Andrade, State University of Amazonas
Superior School of Health Sciences, State University of Amazonas, Manaus, Amazonas, Brazil.
Caroline Mathias, University of Campinas
Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, São Paulo, Brazil.
Hugo Felipe do Vale, State University of Amazonas
Superior School of Health Sciences, State University of Amazonas, Manaus, Amazonas, Brazil.
Flávio Henrique Baggio Aguiar, University of Campinas
Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, São Paulo, Brazil.
Giselle Maria Marchi, University of Campinas
Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, São Paulo, Brazil.

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Published
2019-11-12
How to Cite
Andrade, K. M. G. de, Mathias, C., Vale, H. F. do, Aguiar, F. H. B., & Marchi, G. M. (2019). Effect of diphenyliodonium hexafluorphosphate in the yellowing and properties of experimental resin cements. Brazilian Journal of Oral Sciences, 18, e191591. https://doi.org/10.20396/bjos.v18i0.8657256

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