Professional and Technological Education Center, Federal University of Paraná, Curitiba, Paraná, Brazil.
Oper Dent. 2012 May-Jun;37(3):281-9. doi: 10.2341/11-134-L. Epub 2012 Feb 7.
The objective of this study was to determine the degree of conversion (DC), hardness (H), and modulus of elasticity (E) of a dual-cured resin cement, a light-cured resin cement, and a flowable resin cured through opaque or translucent ceramic with different exposure times. RelyX ARC (dual), RelyX Veneer (light-cured), and Filtek Z350 Flow resin specimens 0.5 mm thick were cured for 40, 80, and 120 seconds through 1-mm thick translucent or opaque feldspathic ceramic disks (n=10). The specimens were stored at 37°C for 24 hours. Half of each specimen was used to test the DC and the other half to test H and E. The DC was determined in a Fourier transform infrared spectrometer in absorbance mode at peaks of 1638 cm(-1) and 1610 cm(-1). H and E were determined using nanoindentation with one loading cycle and a maximum load of 400 mN. The data were analyzed with three-way analysis of variance (ANOVA), the Games-Howell test, and the Pearson correlation test (α=0.05). Statistically significant differences were found for all three factors (material, opacity, and exposure time), as well as interaction between them. The opaque ceramic resulted in lower DC, H, and E than the translucent ceramic for an exposure time of 40 seconds. An exposure time of 120 seconds resulted in a similar DC for all materials, irrespective of the opacity of the ceramic. Materials cured for 120 seconds had higher H and E than those cured for 40 seconds. The exposure time and opacity of the ceramic exerted an influence on the DC, H, and E of the materials evaluated.
本研究旨在确定一种双重固化树脂水门汀、一种光固化树脂水门汀和一种通过不透明或半透明陶瓷固化的流动性树脂的转化率（DC）、硬度（H）和弹性模量（E），其曝光时间不同。将厚度为 0.5mm 的 RelyX ARC（双重固化）、RelyX Veneer（光固化）和 Filtek Z350 Flow 树脂试件通过 1mm 厚的半透明或不透明长石陶瓷圆盘分别固化 40、80 和 120 秒（n=10）。将试件在 37°C 下储存 24 小时。每个试件的一半用于测试 DC，另一半用于测试 H 和 E。DC 通过傅里叶变换红外光谱仪在 1638cm(-1) 和 1610cm(-1) 峰处的吸光度模式下进行测定。H 和 E 通过纳米压痕法在一个加载循环和最大负载为 400mN 的条件下进行测定。采用三因素方差分析（ANOVA）、Games-Howell 检验和 Pearson 相关检验（α=0.05）对数据进行分析。所有三个因素（材料、不透明度和曝光时间）以及它们之间的相互作用都存在统计学差异。对于曝光时间为 40 秒的情况，不透明陶瓷导致 DC、H 和 E 均低于半透明陶瓷；对于所有材料，曝光时间为 120 秒时，DC 相似，而陶瓷的不透明度则无关紧要。曝光时间为 120 秒的材料的 H 和 E 高于曝光时间为 40 秒的材料。陶瓷的曝光时间和不透明度对所评估材料的 DC、H 和 E 有影响。
