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目的:评估不同厚度加强型玻璃陶瓷对3种双固化树脂水门汀Multilink N(Ivoclar Vivadent)、Rely X Ultimate(3M)以及NX3-Nexus(Kerr)聚合转化率(degree of conversion,DC)的影响。方法:使用硬组织切片机将upcera锂瓷、e.max瓷制作成厚度分别为(2.00±0.05)mm、(3.00±0.05)mm和(4.00±0.05)mm的3组正方形瓷片,应用紫外可见近红外分光光度计测量波长400~515 nm可见光范围内的透射率。利用傅里叶红外光谱仪,检测“C=C”吸收峰和“C-C”吸收峰的吸光度值,计算树脂水门汀的DC。采用SPSS 21.0软件包对数据进行统计学分析。结果:2种瓷片在所检测可见光范围内随着厚度的增加,可见光透光率明显降低。在一定波长范围内,2 mm厚度的upcera锂瓷透光率高于e.max瓷,3 mm、4 mm 2种瓷片透光率差异无显著性。2 mm厚度的upcera锂瓷和2 mm厚度的e.max瓷作为固化中介物时,Mutilink N和Rely X Ultimate的固化效率低于NX3-Nexus组。结论:瓷片厚度为2 mm时,upcera锂瓷的透光率高于e.max瓷。upcera锂瓷对Mutilink N和Rely X Ultimate固化效率的影响大于e.max瓷。
OBJECTIVE: To evaluate the effect of different thickness reinforced glass ceramics on the degree of conversion (DC) of three kinds of double-cured resin cements Multilink N (Ivoclar Vivadent), Rely X Ultimate (3M) and NX3-Nexus (Kerr). Methods: The upcera lithium porcelain and e.max porcelain were made into three groups of square porcelain with the thickness of (2.00 ± 0.05) mm, (3.00 ± 0.05) mm and (4.00 ± 0.05) mm respectively by hard tissue microtome, Visible near-infrared spectrophotometer to measure the wavelength of 400 ~ 515 nm transmittance within the visible range. The DC of the resin cement was calculated by using the Fourier transform infrared spectrometer (FTIR) to measure absorbance values of the absorption peaks “C = C” and “C-C”. Data were statistically analyzed using SPSS 21.0 software package. Results: The transmittance of visible light decreased obviously with the increase of the thickness of the two kinds of tiles in the visible range. In a certain wavelength range, 2 mm thick upcera lithium ceramic transmittance higher than e.max porcelain, 3 mm, 4 mm 2 kinds of ceramic light transmittance was no significant difference. The solidification efficiency of Mutilink N and Rely X Ultimate was lower than that of the NX3-Nexus group when using 2 mm thick upcera lithium ceramic and 2 mm thick e.max porcelain as a curing agent. Conclusion: The transmittance of upcera lithium porcelain is higher than that of e.max porcelain when the thickness of porcelain is 2 mm. The effect of upcera lithium on curing efficiency of Mutilink N and Rely X Ultimate is greater than e.max porcelain.