Initial curing characteristics of composite cements under ceramic restorations
Initial curing characteristics of composite cements under ceramic restorations
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DOI：
10.2186/jpr.jpor_2019_330
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发表时间：
2021-01-01
影响因子：
3.6
通讯作者：
Van Meerbeek, Bart
中科院分区：
文献类型：
--
作者：
Inokoshi, Masanao;Nozaki, Kosuke;Van Meerbeek, Bart
方法：将G-CEM LinkForce(GC)、Panavia V5(Kuraray Noritake)或ResiCEM(Shofu)混合粘固剂放置在傅立叶变换红外光谱仪(FTIR；IS50，Thermo Science)的ATR晶体上，用显微镜盖玻璃挤压至100微米的膜厚。在自固化模式下，在37℃的黑暗中测量复合粘固剂的DC(%)。在双固化模式下，使用两个光固化单元(G-Light Prima 2，GC；PenCure，Morita)直接光固化(阳性对照)或通过陶瓷贴面氧化锆盘(0.5 mm厚的氧化锆和1.0 mm厚的贴面陶瓷)光固化40秒。每组5次，分别测定自愈和双愈模式下的DC(n=5)。采集复合水泥膜的FTIR光谱，每隔1分钟至30分钟测定一次DC。用双向重复测量方差分析进行统计学比较(α=0.05)。结果：在所研究的所有粘固剂中，自固化模式在10、20和30min时的DC显著低于光固化模式。当复合粘固剂通过氧化锆盘光固化时，30min时ResiCem(Shofu)的DC显著下降，而Panavia V5(Kuraray Noritake)和G-CEM LinkForce(GC)的DC则不明显。结论：自固化可以减缓聚合速度，但并不是所有复合粘固剂的DC都达到最高(光固化)。陶瓷贴面氧化锆基修复体可能会影响某些复合粘固剂的离散度。
Purpose: To assess the degree of conversion (DC) of dual-curing composite cements when cured through ceramic-veneered zirconia disks.Methods: Portions of mixed cement, either G-CEM LinkForce (GC), Panavia V5 (Kuraray Noritake) or ResiCEM (Shofu), were placed on the ATR crystal of a Fourier Transform Infrared Spectroscope (FTIR; iS50, Thermo Scientific) and squeezed to a 100-mu m film thickness using a microscopy cover glass. DC (%) of the composite cements applied in self-curing mode was measured in the dark at 37 degrees C. Following the dual-curing mode, the cements were light-cured directly (positive control) or through a ceramic-veneered zirconia disk (0.5-mm thick zirconia with a 1.0-mm thick veneering ceramic) for 40 sec using two light-curing units (G-Light Prima 2, GC; PenCure, Morita). Per experimental group, 5 tests were conducted to measure DC in self-cure and dual-cure mode (n=5). FTIR spectra of the composite cement films were acquired to determine DC every min up to 30 min. DC of the composite cements was statistically compared using two-way repeated-measures ANOVA (alpha=0.05).Results: For all cements investigated, the self-curing mode resulted in significantly lower DC at 10, 20 and 30 min than the light-curing mode. When the composite cements were light-cured through the zirconia disk, DC at 30 min dropped significantly for ResiCem (Shofu), while not for Panavia V5 (Kuraray Noritake) and G-CEM LinkForce (GC).Conclusions: Self-curing slows down polymerization but does not reach for all composite cements the highest (light-cured) DC. Ceramic-veneered zirconia-based restorations may affect DC of some composite cements.