Doctoral student, Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University, Seoul, Republic of Korea.
Research Professor, Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University, Seoul, Republic of Korea.
J Prosthet Dent. 2018 Mar;119(3):461-466. doi: 10.1016/j.prosdent.2017.04.005. Epub 2017 Jul 8.
STATEMENT OF PROBLEM: The color of dental ceramics is important for achieving successful esthetic restorations. However, insufficient studies are available of the color of recently introduced computer-aided design-computer-aided manufacturing (CAD-CAM) lithium disilicate ceramics as functions of the core and veneer thicknesses. PURPOSE: The purpose of this in vitro study was to evaluate the effects of the thickness of different core and veneer thicknesses on the color of CAD-CAM lithium disilicate ceramics. MATERIAL AND METHODS: A total of 42 specimens from 2 groups of 7 ceramic cores at 3 thicknesses (0.8, 1.0, and 1.2 mm) were fabricated. The veneer was fabricated at 3 thicknesses (0.3, 0.5, and 0.7 mm). The group name was based on the name of the ceramic core (IPS e.max CAD; lithium disilicate [LD], IPS Empress CAD; leucite-reinforced glass-ceramic [LR]), and the associated number was determined by the combined thicknesses of the core and the veneer: 1=0.8+0.7; 2=1.0+0.5; and 3=1.2+0.3. The color coordinates and the color differences were calculated using a spectrophotometer. The color difference was analyzed using the CIEDE2000 chrominance and the acceptability threshold. Two-way ANOVA was used to identify the color difference based on the core/veneer thicknesses, and the Tukey honest significant differences and Games-Howell tests were conducted to verify the ΔE differences of the group (α=.05). In addition, regression analysis was carried out to estimate the causal relationship between the independent variables and the chrominance. RESULTS: At a certain thickness, the color differences of LD1, LR1, and LR2 were not clinically acceptable based on the thicknesses of the core and the veneer. Results of 2-way ANOVA demonstrated that the different thicknesses of core/veneer combination significantly affected the color difference (P<.05). A significant interaction was present between the thickness and the material (P<.05). The results of multiple regression analyses showed that the average color difference of LR increased by 0.019 as the thickness of the core decreased by 0.2 mm. CONCLUSIONS: The color is influenced by the thicknesses of the core and the veneer. With a certain thickness, the color differences increased as the thickness of the core decreased, and lithium disilicate ceramics were less vulnerable to standard deviation of color difference compared with the leucite-reinforced ceramics.
问题陈述：牙科陶瓷的颜色对于实现成功的美学修复至关重要。然而，目前关于最近引入的计算机辅助设计-计算机辅助制造（CAD-CAM）锂硅玻璃陶瓷的颜色的研究还不够充分，这些研究涉及到陶瓷核层和面层厚度的影响。
目的：本体外研究的目的是评估不同核层和面层厚度对 CAD-CAM 锂硅玻璃陶瓷颜色的影响。
材料和方法：从 2 组 7 种陶瓷核层（厚度分别为 0.8、1.0 和 1.2mm）中制备了 42 个样本。面层的厚度为 0.3、0.5 和 0.7mm。组名基于陶瓷核层的名称（IPS e.max CAD；锂硅玻璃陶瓷[LD]、IPS Empress CAD；掺锂玻璃陶瓷[LR]），相关数字由核层和面层的组合厚度确定：1=0.8+0.7；2=1.0+0.5；3=1.2+0.3。使用分光光度计计算颜色坐标和颜色差异。使用 CIEDE2000 色度和可接受阈值分析颜色差异。采用双向方差分析根据核/面层厚度确定颜色差异，采用 Tukey 诚实显著差异和 Games-Howell 检验验证组的 ΔE 差异（α=0.05）。此外，进行回归分析以估计独立变量与色度之间的因果关系。
结果：在一定厚度下，根据核层和面层的厚度，LD1、LR1 和 LR2 的颜色差异在临床不可接受。双向方差分析的结果表明，核/面层组合的不同厚度显著影响颜色差异（P<.05）。厚度和材料之间存在显著的交互作用（P<.05）。多元回归分析的结果表明，随着核层厚度减少 0.2mm，LR 的平均颜色差异增加 0.019。
结论：颜色受核层和面层厚度的影响。在一定厚度下，随着核层厚度的减小，颜色差异增大，与掺锂玻璃陶瓷相比，锂硅玻璃陶瓷对颜色差异的标准差更不敏感。
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