J Adhes Dent. 2019;21(1):67-76. doi: 10.3290/j.jad.a41997.
To evaluate the light transmittance of ceramic veneers of different thicknesses and verify their influence on the degree of conversion, color stability, and dentin bond strength of light-curing resin cements containing different photoinitiator systems.
Experimental resin cements were fabricated containing camphorquinone and amine (CQ-amine), TPO, Ivocerin (IVO), or TPO and Ivocerin (TPO-IVO). All photoinitiators were characterized by UV-Vis spectrophotometry. Disk-shaped lithium disilicate ceramic specimens that were 0.4, 0.7, and 1.5 mm in thickness were prepared using IPS e.max Press (Ivoclar Vivadent, shade LT/A2). Light transmittance through each specimen was measured using spectrophotometry. Specimens of each cement (n = 10) were made in a custom-designed mold and were light cured through each glass-ceramic disk using a multiwave LED (Bluephase G2, Ivoclar Vivadent). CS was evaluated using spectrophotometry before and after artificial aging with UV light. DC was evaluated using FTIR-spectroscopy. Dentin µSBS was evaluated using 0.75-mm-thick specimens that were light cured under the same protocol (n = 10). All data were submitted to two-way ANOVA and Tukey's test (α = 0.05; β = 0.2).
CQ-amine cements showed the highest color changes (p < 0.05) due to increased yellowing when compared to the amine-free cements (p < 0.05). However, all cements showed a significant color change after aging when cured through ceramics up to 1.5 mm thick (p < 0.05). The TPO-IVO cement showed the highest DC and the IVO cement showed a similar DC when compared to the CQ-amine cement. The TPO cement presented the lowest DC (p = 0.0377). No differences in mean dentin µSBS were found among the cements, except for the TPO cement, which presented a lower mean dentin µSBS (p = 0.0277).
Amine-free cements containing Ivocerin and TPO seem to be a better alternative to CQ-amine cements, while not reducing either DC or dentin µSBS of amine-free cements. However, CQ-amine and amine-free cements still seem to change color over time.
评估不同厚度的陶瓷贴面的透光率，并验证其对不同光引发剂系统的光固化树脂水门汀的转化率、颜色稳定性和牙本质粘结强度的影响。
制备含有樟脑醌和胺（CQ-胺）、TPO、Ivocerin（IVO）或 TPO 和 Ivocerin（TPO-IVO）的实验性树脂水门汀。所有光引发剂均通过紫外可见分光光度法进行表征。使用 IPS e.max Press（Ivoclar Vivadent，LT/A2 色调）制备厚度为 0.4、0.7 和 1.5 毫米的锂二硅陶瓷试件。使用分光光度计测量每个试件的透光率。将每种水门汀（n = 10）的试件在定制模具中制成，并通过多波 LED（Ivoclar Vivadent 的 Bluephase G2）穿过每个玻璃陶瓷盘进行光固化。使用分光光度计在人工老化后（紫外线照射）评估 CS。使用傅里叶变换红外光谱法（FTIR）评估 DC。使用 0.75 毫米厚的试件在相同方案下光固化，评估牙本质 μSBS（n = 10）。所有数据均进行双向方差分析和 Tukey 检验（α = 0.05；β = 0.2）。
与不含胺的水门汀相比，CQ-胺水门汀由于泛黄而表现出最高的颜色变化（p < 0.05）。然而，所有水门汀在通过厚度达 1.5 毫米的陶瓷光固化后均显示出显著的颜色变化（p < 0.05）。与 CQ-胺水门汀相比，TPO-IVO 水门汀显示出最高的 DC，而 Ivocerin 水门汀显示出相似的 DC。TPO 水门汀显示出最低的 DC（p = 0.0377）。除 TPO 水门汀外，各组水门汀的牙本质 μSBS 均值无差异，而 TPO 水门汀的牙本质 μSBS 均值较低（p = 0.0277）。
含有 Ivocerin 和 TPO 的不含胺的水门汀似乎是 CQ-胺水门汀的更好选择，同时不会降低不含胺的水门汀的 DC 或牙本质 μSBS。然而，CQ-胺和不含胺的水门汀似乎仍会随时间变色。
