Initial curing characteristics of composite cements under ceramic restorations

Purpose: To assess the degree of conversion (DC) dual-curing composite cements when cured through ceramic-veneered zirconia disks. Methods: Portions mixed cement, either G-CEM LinkForce (GC), Panavia V5 (Kuraray Noritake) or ResiCEM (Shofu), were placed on ATR crystal a Fourier Transform Infrared Spectroscope (FTIR; iS50, Thermo Scientific) and squeezed to 100-µm film thickness using microscopy cover glass. DC (%) applied in self-curing mode was measured dark at 37°C. Following mode, light-cured directly (positive control) disk (0.5-mm thick with 1.0-mm veneering ceramic) for 40 sec two light-curing units (G-Light Prima 2, GC; PenCure, Morita). Per experimental group, 5 tests conducted measure self-cure dual-cure (n=5). FTIR spectra cement films acquired determine every min up 30 min. statistically compared two-way repeated-measures ANOVA (?=0.05). Results:For all investigated, resulted significantly lower 10, 20 than mode. When disk, dropped ResiCem while not (GC). Conclusions: Self-curing slows down polymerization but does reach highest (light-cured) DC. Ceramic-veneered zirconia-based restorations may affect some cements.