陶瓷成分和色调对双固化树脂水门汀透光率和转化率的影响。
Influence of the composition and shades of ceramics on light transmission and degree of conversion of dual-cured resin cements.
机构信息
Universidade Tiradentes, Departamento de Prótese, Aracaju, Sergipe, Brasil.
Universidade de São Paulo, Faculdade de Odontologia de Bauru, Departmento de Prótese e Periodontia, Bauru, São Paulo, Brasil.
出版信息
J Appl Oral Sci. 2019 Jul 29;27:e20180351. doi: 10.1590/1678-7757-2018-0351.
OBJECTIVE
Since the transmittance of ceramics can influence the degree of conversion (DC) of resin cements, ceramics composition and shade should be considered in the selection of resin cement. This in vitro study aimed to evaluate the effect of the transmittance of different composition, opacities and shades of ceramics on the degree of conversion of two dual-cured resin cements.
METHODOLOGY
Sixty discs were prepared from low translucency (LT) and medium opacity (MO) lithium disilicate ceramic, and zirconia ceramic (Z). Each group was subdivided into 5 subgroups (n=4) in shades A2, A3.5, B2, C2 and D3. The transmittance measurement was performed in a spectrophotometer. The Variolink II and Rely X U200 resin cements were photoactivated by LED (1400 mW/cm2) for 40 s through the ceramic discs and without the discs (control group). The DC was measured with infrared FTIR spectroscopy, immediately after light activation. Data were analyzed with Kruskall-Wallis and one-way ANOVA, following post-hoc comparisons by Tukey test and Pearson's correlation test (P<0.05).
RESULTS
LT ceramic exhibited higher transmittance values compared to MO and Z ceramics. LTA2 and LTB2 showed statistically higher transmittance values compared to MOA2, MOA3.5 and ZA3.5. For Variolink II, the ceramic interposition did not influence the DC, since there were no statistical differences between groups with ceramic interposition and the control group. For Rely X U200 cement, the interposition of some ceramics types/shades (LTA3.5, MOA2, MOA3.5 and ZA3.5) significantly decreased the DC values compared to control group. A positive correlation was found between the ceramic transmittance and DC values of both tested cements. Conclusions. The transmittance and DC values of the cements were influenced by composition and shades of the ceramics. The higher the transmittance of ceramics, the higher the DC values for both cements.
目的
由于陶瓷的透光率会影响树脂水门汀的转化率（DC），因此在选择树脂水门汀时应考虑陶瓷的成分和遮色效果。本体外研究旨在评估不同成分、不透明度和遮色效果的陶瓷对两种双重固化树脂水门汀的 DC 的影响。
方法
从低透光率（LT）和中不透明度（MO）锂硅陶瓷和氧化锆陶瓷（Z）中制备 60 个圆盘。每组根据颜色 A2、A3.5、B2、C2 和 D3 进一步分为 5 个亚组（n=4）。使用分光光度计进行透光率测量。通过陶瓷圆盘和无圆盘（对照组）对 Variolink II 和 Rely X U200 树脂水门汀进行 LED（1400 mW/cm2）光激活 40 s。在光激活后立即使用红外 FTIR 光谱法测量 DC。使用 Kruskal-Wallis 和单向方差分析对数据进行分析，然后使用 Tukey 检验和 Pearson 相关检验进行事后比较（P<0.05）。
结果
LT 陶瓷的透光率值高于 MO 和 Z 陶瓷。与 MOA2、MOA3.5 和 ZA3.5 相比，LTA2 和 LTB2 的透光率值具有统计学意义。对于 Variolink II，陶瓷插入不会影响 DC，因为陶瓷插入组与对照组之间没有统计学差异。对于 Rely X U200 水泥，一些陶瓷类型/颜色（LTA3.5、MOA2、MOA3.5 和 ZA3.5）的插入会显著降低与对照组相比的 DC 值。发现陶瓷透光率与两种测试水泥的 DC 值之间存在正相关关系。结论：陶瓷的透光率和 DC 值会受到陶瓷成分和遮色效果的影响。陶瓷透光率越高，两种水泥的 DC 值越高。
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