J Adhes Dent. 2017;19(3):239-243. doi: 10.3290/j.jad.a38410.
Short initial light curing or "tack curing" is used to create a semi-gel state in luting cements for easier excess material cleanup. The effect of tack curing on the final cure of luting cements was measured in terms of hardness.
Three cement types were tested: two dual-curing composite cements (RelyX Unicem 2; Maxcem Elite); three light-curing veneer cements (Choice 2; Variolink Esthetic LC; RelyX Veneer); and two self-curing resin-modified glass-ionomer (RMGI) luting cements (RelyX Luting Plus; Nexus RMGI). Cements were placed in 1.5 × 2 × 8 mm plaster slots covered with orange glass during curing and were cured from one end. Tack curing was performed for 2 to 5 s using an LED curing light, followed 2 min later by 10-40 s final light curing or self-curing, as per manufacturer instructions (n = 10). Control groups received only final light curing or self-curing. After 24 h storage (37°C, 100% humidity), Vickers hardness was measured in 0.5-mm depth increments. Results were analyzed using two-way ANOVA and pairwise comparisons (α = 0.05).
The hardness of dual-curing and light-curing cements significantly decreased with increasing depth (p = 0.0001). Tack curing of dual-curing and light-curing cements tended to increase hardness at all depths, except near the surface for light-curing veneer cements. Self-curing cements showed no hardness reduction with depth and no effect from tack curing.
Although a slight surface hardness reduction may occur in light-curing veneer cements, the overall effect on three luting cement types was insignificant or resulted in only a slight increase in depth-of-cure.
短时间的初始光固化或“初粘固化”用于使粘固剂呈半凝胶状态，从而更易于清除多余材料。本研究通过测量硬度来评估初粘固化对粘固剂最终固化的影响。
测试了 3 种水泥类型：两种双重固化复合水泥（RelyX Unicem 2；Maxcem Elite）；三种光固化贴面水泥（Choice 2；Variolink Esthetic LC；RelyX Veneer）；两种自固化树脂改性玻璃离子水门汀（RMGI）粘固剂（RelyX Luting Plus；Nexus RMGI）。在固化过程中，将水泥放入 1.5×2×8mm 的石膏槽中，并用橙色玻璃覆盖，并从一端进行固化。根据制造商的说明，使用 LED 固化灯进行 2 至 5s 的初粘固化，然后再进行 10-40s 的最终光固化或自固化（n=10）。对照组仅接受最终的光固化或自固化。24 h 储存（37°C，100%湿度）后，以 0.5mm 的增量测量维氏硬度。使用双因素方差分析和两两比较（α=0.05）进行结果分析。
双重固化和光固化水泥的硬度随深度的增加而显著降低（p=0.0001）。在所有深度下，双重固化和光固化水泥的初粘固化都会增加硬度，但光固化贴面水泥在靠近表面处除外。自固化水泥的硬度随深度没有降低，也不受初粘固化的影响。
尽管光固化贴面水泥的表面硬度可能略有降低，但对 3 种粘固剂类型的整体影响不显著，或者仅导致固化深度略有增加。
