State University of Campinas, Department of Restorative Dentistry, Piracicaba, SP, Brazil.
Oper Dent. 2010 May-Jun;35(3):295-9. doi: 10.2341/09-252-L.
This study evaluated the effect of curing mode (auto- and dual-polymerizing mode) and time interval (5, 10 and 15 minutes) on the degree of conversion of resin cements. One conventional dual-cured resin cement (Panavia F 2.0 [Kuraray Medical Inc]) and two self-adhesive cements (RelyX Unicem [3M ESPE] and BisCem [BISCO, Inc]) were evaluated. The products (n = 5) were manipulated according to the manufacturer's instructions and applied to the surface of a horizontal attenuated reflectance unit attached to an infrared spectrometer. The materials were either light-cured for 40 seconds (dual-polymerizing mode) or allowed to auto-polymerize. The degree of conversion was calculated according to changes in the aliphatic-to-aromatic peak ratios prior to and 5, 10 and 15 minutes after light-activation or after mixing when the specimens were allowed to auto-polymerize. Data (%) were analyzed by two-way repeated measure ANOVA (curing mode and time interval) and Tukey's post-hoc test (alpha = 0.05%). The light-activating mode led to a higher degree of conversion values than the self-curing mode in self-adhesive cements (RelyX Unicem and BisCem), while there was no difference in the degree of conversion between the self- and light-cured groups of Panavia F 2.0 resin cement. All products showed a higher degree of conversion at 15 minutes postcuring than any other evaluation interval. The self-adhesive cements provide a higher degree of conversion values when light-activated. After 15 minutes of polymerization initiation, the degree of conversion was higher in all resin cements, regardless of the curing mode.
本研究评估了固化模式（自动和双重聚合模式）和时间间隔（5、10 和 15 分钟）对树脂水门汀转化率的影响。评估了一种传统的双重固化树脂水门汀（Panavia F 2.0[Kuraray Medical Inc.])和两种自粘接水门汀（RelyX Unicem[3M ESPE]和BisCem[BISCO, Inc.]）。根据制造商的说明操作产品（n=5），并将其施加到附着在红外光谱仪上的水平衰减反射单元的表面上。材料要么进行 40 秒的光固化（双重聚合模式），要么允许自动聚合。在光激活之前和之后的 5、10 和 15 分钟以及允许自聚合时混合后，根据脂肪族峰与芳香族峰比值的变化计算转化率。（%）数据采用双向重复测量方差分析（固化模式和时间间隔）和 Tukey 事后检验（α=0.05%）进行分析。光激活模式导致自粘接水门汀（RelyX Unicem 和 BisCem）的转化率值高于自固化模式，而 Panavia F 2.0 树脂水门汀的自固化组和光固化组之间的转化率没有差异。所有产品在固化后 15 分钟的转化率均高于其他任何评估间隔。光激活时，自粘接水门汀提供更高的转化率值。聚合引发 15 分钟后，所有树脂水门汀的转化率均较高，无论固化模式如何。
