Influence of the ceramic translucency on the relative degree of conversion of a direct composite and dual-curing resin cement through lithium disilicate onlays and endocrowns

The goal of this study was to investigate the influence ceramic translucency, restoration type and polymerization time on relative degree conversion a dual-curing resin cement conventional microhybrid composite using high-power light-curing device. Two 4.0 mm thick onlay (O) two 7.5 endocrown (E) lithium disilicate restorations in high low translucency (HT/LT) were fabricated decapitated molar. pulp chamber prepared accommodate 2 layer (MHC) or (DCC). Composite specimens light-cured (n = 15; 1200 mW/cm2) without through an restoration. Fourier-transform infrared spectroscopy (FTIR) absorbance curves collected for same specimen after 3 × 20, 40, 60 90 s light-curing. (DC%) calculated results analyzed Kruskal-Wallis test Friedman's ANOVA. Alpha set at 0.05. After s, DC MHC significantly lower (p 0.03; r 0.61) under LT/EC (Mdn: 77.8%) than HT/EC 95.2%). DCC not affected by type. had significant higher HT/O, LT/O HT/E restorations. There no differences between cured LT/E 60s polymerization, but different translucent onlays. use bonding onlays endocrowns seems feasible.