Influence of thickness and translucency of lithium disilicate ceramic on degree of conversion of resinous materials
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Priscila-Christiane-Suzy Liporoni [1] ; Alcira-Cinthia-Rodríguez Ponce [1] ; Maiara-Rodrigues de Freitas [1] ; Rayssa-Ferreira Zanatta [1] ; Maria-Clara-Santos Pereira [1] ; Anderson Catelan [2]
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[1] Universidade de Taubaté
Universidade de Taubaté
Brasil
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[2] Assistant Professor, Department of Dentistry, University of Taubaté, Taubaté, SP, Brazil; Assistant Professor, Graduate Program in Dentistry, Faculty of Health Sciences, University of Western São Paulo, Presidente Prudente, SP, Brazil
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- Localización: Journal of Clinical and Experimental Dentistry, ISSN-e 1989-5488, Vol. 12, Nº. 8 (August), 2020, págs. 745-748
- Idioma: inglés
- Enlaces
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Resumen
In this study was assessed the degree of conversion (DC) of amine-free resin cements light cured through lithium disilicate-reinforced ceramics at different thicknesses and translucency.
Specimens were divided into 21 groups (n = 5) according to luting agent used: Variolink Esthetic LC (Light shade), RelyX Ultimate (A1 shade), and Filtek Z350 XT Flow (A1 shade); the ceramic translucency: low (LT) and high (HT); and the ceramic thickness: no ceramic (control), 0.5 mm, 1 mm, and 2 mm. A Teflon mold with (5 x 5 x 0.5 mm) was used to standardize the cement and over it the ceramic block from each group was placed. Set was cured using a polywave LED light (1200 mW/cm2 - Bluephase G2) for 40 s. FTIR spectra of uncured and cured materials was obtained and DC calculated from the height of the peaks 1610 and 1640 cm-1. Data were submitted to ANOVA followed by Tukey’s test (α = 0.05).
There was a significant difference for luting agents (p< 0.0001) and translucency (p = 0.025), but not for thickness (p = 0.73). Dual amine-free RelyX Ultimate showed the lowest DC values and higher translucency promoted higher DC.
Dual amine-free cement showed the lowest monomer conversion and higher translucency ceramics promoted a higher DC.
