Abstract
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.
Highlights
The use of ceramic veneers has increased in Dentistry
degree of conversion (DC) of the light-cured cement through ceramics with 0.5 and 1.0 mm thickness was similar to the control (p>0.05), regardless of the type of ceramic (Table 1 and Fig. 1)
There are advantages in using light-cured resin-based cements for luting ceramic veneers, the possible attenuation of the light intensity provided by the thickness and type of ceramic may be relevant
Summary
The use of ceramic veneers has increased in Dentistry. For the success of this procedure, the esthetic quality of the material is not the only criterion to be considered. Due to the lack of control of the positioning time of ceramic veneers, use of these cements without the catalyst paste has been proposed [3]. This procedure, may cause a decrease in the mechanical properties of the resin cement [4]. For these reasons, one-paste resin-based materials, in which the operator could control the curing time, were developed. The use of light-cured cements is based on the idea that the light could pass through the indirect restoration due their translucency and reduced thickness
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