Lu Huan, Powers John M
Houston Biomaterials Research Center, Department of Restorative Dentistry and Biomaterials, University of Texas Dental Branch at Houston, 6516 M.D. Anderson Blvd., DBB 467, Houston, TX 77030-3402, USA.
Am J Dent. 2004 Oct;17(5):354-8.
To study the color stability of different resin cements after accelerated aging.
The color stability of a self-adhesive resin cement (Unicem), one resin-based composite cement (Variolink II), one compomer cement (Principle) and one hybrid ionomer cement (FujiCEM) was studied. Two curing modes of Unicem (self-cured and dual-cured) and Variolink II (light-cured and dual-cured) were also tested. Specimen disks (n = 5) were prepared with a polytetrafluoroethylene split mold and subjected to accelerated aging for 150, 300 and 450 kJ/m2. Color (CIELAB system) was measured before and after each of the three aging cycles on a reflection spectrophotometer. deltaE*, deltaL*, deltaC* and deltaH* were calculated and analyzed by ANOVA.
The largest color change occurred during the first 150 kJ/m2 aging cycle, where deltaE* values ranged from 5.6 to 20.5 with Principle showing the least color change and FujiCEM the most. The color changes of all the tested materials were perceptible. The greatest changes were recorded for deltaL* and/or deltaC*. All specimens became significantly rougher and showed evidence of cracking and degradation after aging except Variolink II.
研究不同树脂水门汀在加速老化后的颜色稳定性。
研究了一种自粘树脂水门汀（Unicem）、一种树脂基复合水门汀（Variolink II）、一种复合体水门汀（Principle）和一种混合性聚羧酸锌水门汀（FujiCEM）的颜色稳定性。还测试了Unicem的两种固化模式（自固化和双重固化）以及Variolink II的两种固化模式（光固化和双重固化）。使用聚四氟乙烯分体模具制备样本盘（n = 5），并对其进行150、300和450 kJ/m²的加速老化处理。在三个老化循环中的每一个循环前后，使用反射分光光度计测量颜色（CIELAB系统）。计算ΔE*、ΔL*、ΔC和ΔH，并通过方差分析进行分析。
在最初的150 kJ/m²老化循环中颜色变化最大，其中ΔE值范围为5.6至20.5，Principle的颜色变化最小，FujiCEM的颜色变化最大。所有测试材料的颜色变化均明显可见。记录到的最大变化是ΔL和/或ΔC*。除Variolink II外，所有样本在老化后均明显变粗糙，并出现开裂和降解迹象。
