Abstract
Aim: The aim of this study was to evaluate the influence of the translucency of ceramic on water sorption and solubility of resin cements over time. Methods: Lithium disilicate ceramic slides (15x15x1 mm), A1 in color and with different translucencies (high-medium-low) were manufactured; and a glass slide with similar dimension was used as control. Under every slide, 15 specimens (8x0.5 mm) from each resin cement were prepared: light-cured (RelyX Veneer); conventional dual-cured (RelyX ARC); and self-adhesive dual-cured (Rely-X U200). The specimens were then sub-divided according to the period of evaluation (immediately, after 6 and 12 months of storage) (n=5). To evaluate the loss or gain of mass, the specimens were dried until a constant mass was reached. Subsequently, they were divided according to the respective period of storage at 37°C in distilled water and weighed immediately following removal from water. After each period, specimens underwent a new dehydration. Values from water sorption and solubility were calculated and statistically analyzed (Anova 3-way/Tukey test). Results: The lower translucency resulted in greater water sorption and solubility for all cements, regardless of the experimental period. The self-adhesive dual-cured cement showed higher water sorption under all experimental periods and had worse values after 1 year aging. Differences among solubility could only be detected after aging, and the light-cured material had higher values after 6 and 12 months. Conclusions: It could be concluded that the low degree of translucency can negatively influence the passage of light and interfere on the durability of the resin cement. The conventional dual-cured resinous agent seemed to be less affected by such condition.
Highlights
Lithium disilicate glass ceramics are highly esthetic materials that have different levels of translucency for reproducing the optical effects from natural teeth and for masking possible discolorations of the substrate[1]
Statistical analysis of the data pointed out significant double interaction between the main factors “resin cement” and “time”, both in water sorption (p=0.00015) and in solubility (p=0.00019)
Statistically significant differences were observed among the levels of the factor “ceramic translucency” in both variables
Summary
Lithium disilicate glass ceramics are highly esthetic materials that have different levels of translucency for reproducing the optical effects from natural teeth and for masking possible discolorations of the substrate[1]. In adhesive cementation of glass ceramic surfaces, light-activated or conventional dualcured resin cements are frequently used. By their capacity for adhesion to dental tissues, and by their improved mechanical properties, when compared with other agents[4,5]. The polymerization process from dual-cured resin cements occurs by two means: physical, through the action of the light on the photoinitiators; and chemical, through the reaction of benzoyl hydrogen with the tertiary amines[6,7]. Whereas light activated resin cements depend on the visible light of an efficient photoinitiator system so that polymerization of the material occurs effectively, and the properties of the material can be attained to the maximum extent[5]
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