Abstract
Aim: This study evaluated the water sorption and solubility of a light-cured resin cement, under four thicknesses and four opacities of a lithium disilicate ceramic, also considering three light-emitting diode (LED) units. Methods: A total of 288 specimens of a resin cement (AllCem Veneer Trans – FGM) were prepared, 96 samples were light-cured by each of the three light curing units (Valo – Ultradent / Radii-Cal – SDI / Bluephase II – Ivoclar Vivadent), divided into 16 experimental conditions, according to the opacities of the ceramic: High Opacity (HO), Medium Opacity (MO), Low Translucency (LT), High Translucency (HT), and thicknesses (0.3, 0.8, 1.5, and 2.0 mm) (n = 6). The specimens were weighed at three different times: Mass M1 (after making the specimens), M2 (after 7 days of storage in water), and M3 (after dissection cycle), for calculating water sorption and solubility. Results: The higher thickness of the ceramic (2.0 mm) significantly increased the values of water sorption (44.0± 4.0) and solubility (7.8±0.6), compared to lower thicknesses. Also, the ceramic of higher opacity (HO) generated the highest values of sorption and solubility when compared to the other opacities, regardless of the thickness tested (ANOVA-3 factors / Tukey’s test, α = 0.05). There was no influence of light curing units. Conclusion: Higher thicknesses and opacities of the ceramic increased the water sorption and solubility of the tested light-cured resin cement.
Highlights
In recent years, minimal intervention dentistry has presented, as an aesthetic restorative alternative, the use of ceramic veneers, with reduced dental preparation[1,2]
The statistical analysis showed that the thickness and the degree of translucency of the ceramic interfered in the water sorption and solubility values of the light-cured AllCem resin cement, regardless of the light-curing unit used
As a result of water sorption (Table 3), it was found that the greater thickness of the lithium disilicate ceramic (2.0 mm) increased the water sorption values when statistically compared to the thicknesses of 0.3 mm and 0.8 mm
Summary
Minimal intervention dentistry has presented, as an aesthetic restorative alternative, the use of ceramic veneers, with reduced dental preparation[1,2]. Resin cement can be classified according to its polymerization: self-curing, light-curing, and dual[5,6]. Light-cured cements are the most suitable, since self-curing and dual cements present, in their composition, tertiary amines, which, when reacted with benzoyl peroxide, become responsible for the yellowing of the material[6]. Considering that ceramic laminates have a reduced thickness in many cases, this yellowing could compromise the aesthetic result of the treatment, especially in long term[1,7]
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