Degree of conversion of a resin cement light-cured through ceramic veneers of different thicknesses and types.
During the cementation of ceramic veneers the polymerization of resin cements may be jeopardized if the ceramics attenuate the irradiance of the light-curing device. The aim of this study was to evaluate the effect of different types and thicknesses of ceramic veneers on the degree of conversion of a light-cured resin-based cement (RelyX Veneer). The cement was light-cured after interposing ceramic veneers [IPS InLine, IPS Empress Esthetic, IPS e.max LT (low translucency) and IPS e.max HT (high translucency) - Ivoclar Vivadent] of four thicknesses (0.5 mm, 1.0 mm, 1.5 mm and 2.0 mm). As control, the cement was light-cured without interposition of ceramics. The degree of conversion was evaluated by FTIR spectroscopy (n=5). Data were analyzed with one-way ANOVA and Tukey's test (α=0.05). Significant differences were observed among groups (p<0.001). The degree of conversion was similar to the control for all light-cured groups with interposition of ceramics of 0.5 mm and 1.0 mm (p>0.05). Among 1.5-mm-thick veneers, IPS e.max LT was the only one that showed different results from the control (p<0.05). At the thickness of 2.0 mm, only the IPS e.max LT and HT veneers were able to produce cements with degrees of conversion similar to the control (p>0.05). The degree of conversion of the evaluated light-cured resin cement depends on the thickness and type of ceramics employed when veneers thicker than 1.5 mm are cemented.
Master of Science Program in Clinical Dentistry, Positivo University, Curitiba, PR, Brazil.
Patrício
P
Runnacles
Master of Science Program in Clinical Dentistry, Positivo University, Curitiba, PR, Brazil.
Gisele Maria
GM
Correr
Master of Science Program in Clinical Dentistry, Positivo University, Curitiba, PR, Brazil.
Flares
F
Baratto Filho
Master of Science Program in Clinical Dentistry, Positivo University, Curitiba, PR, Brazil.
Carla Castiglia
CC
Gonzaga
Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil.
Adilson Yoshio
AY
Furuse
D002516:Ceramics; D003801:Dental Veneers; D008027:Light