ArticleBrazilian dental journal2025
Influence of glass-ceramics transmittance on chemomechanical properties of light- and dual-cure resin cements.
Article in Brazilian dental journal, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
This study assessed the effects of light attenuation by glass-ceramics (IPS e.max Press, IPS e.max CAD, IPS Empress CAD, and Vita Suprinity) on the degree of conversion (DC), polymerization shrinkage stress (PSS), and microshear bond strength (µSBS) of dual-cure (RelyX Universal and RelyX Ultimate) and light-cure (Variolink N LC and Variolink Esthetic LC) resin cements. Ten slabs (12 × 12 × 1.5 mm) were fabricated from each ceramic. For light attenuation analysis (n=1), the ceramic slab was positioned onto the light-curing tip (Valo-Cordless), and the radiant emittance (mW/cm²) was measured. Resin cement cylinders (n=10) were fabricated using Tygon tubes positioned onto ceramic slabs, water-stored for 24 h, and tested for µSBS. For the PSS test, glass rods were positioned 1 mm apart, and the gap was filled with resin cement, which was light-cured. The rod displacement was considered for the calculation of PSS. The DC test (n=3) for each resin cement was conducted using a spectrometer. Surface morphology was examined by SEM (LEO 435 VP, 20 kV) at 5.000×. DC, PSS, and µSBS data were analyzed using ANOVA and Tukey's test (α = 0.05). No significant difference was observed among the resin cements for PSS. Variolink Esthetic LC showed a µSBS mean value statistically lower than RelyX Ultimate. For Suprinity, the light-cure cements showed DC mean values significantly lower than the dual-cure cements. It was possible to conclude that the ceramic slabs significantly increased the light attenuation, which affected the DC, PSS, and µSBS of all the dual- and light-cure resin cements.
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