Optical properties of CAD-CAM ceramic systems
Optical properties of CAD-CAM ceramic systems
复制标题
DOI：
10.1016/j.jdent.2014.07.005
复制
发表时间：
2014-09-01
影响因子：
4.4
通讯作者：
Pecho, Oscar E.
中科院分区：
文献类型：
--
作者：
Bona, Alvaro Della;Nogueira, Audrea D.;Pecho, Oscar E.
目的：目的：评价CAD-CAM陶瓷系统的直接透过率（T%）、半透明性、不透明性和乳光性，以及半透明性参数（TP）与对比度（CR）之间的相关性。CAD HT和LT、IPS Empress CAD HT和LT、ParadigmTM C和VITABLOCS Mark II）并抛光至1.0 +/-0.01 mm厚。使用分光光度计（Lambda 20）在400-780 nm的波长范围内测量T%。另一分光光度计（VITA Easyshade（R）Advance）用于测量样品在白色和黑色背景上的CIE L*a*B* 坐标和反射率值（Y）。计算TP、CR和乳光参数（OP）。采用Cauchy-Schwarz不等式、方差分析、Tukey检验、Bonferroni校正和Pearson相关等方法对数据进行统计分析。光谱行为显示出T%的轻微且恒定的增加，直到约550 nm，然后一些陶瓷随着波长变长而改变行为。TP和CR值分别为16.79 ~ 21.69和0.52 ~ 0.64（r（2）= -0.97）。OP值在3.01 ~ 7.64之间。结论：CAD-CAM陶瓷系统的显微结构影响其光学性能。TP和CR表现出很强的相关性，所有陶瓷系统的评价。然而，所有的陶瓷都表现出一定程度的透光性。意义：除了色度，这项研究表明，其他光学性能的影响，牙科陶瓷的自然外观。(C)2014爱思唯尔有限公司版权所有。
Objectives: To evaluate the direct transmittance (T%), translucency, opacity and opalescence of CAD-CAM ceramic systems and the correlation between the translucency parameter (TP) and the contrast ratio (CR).Methods: Specimens of shades A1, A2 and A3 (n = 5) were fabricated from CAD-CAM ceramic blocks (IPS e. max (R) CAD HT and LT, IPS Empress (R) CAD HT and LT, Paradigm (TM) C, and VITABLOCS (R) Mark II) and polished to 1.0 +/- 0.01 mm in thickness. A spectrophotometer (Lambda 20) was used to measure T% on the wavelength range of 400-780 nm. Another spectrophotometer (VITA Easyshade (R) Advance) was used to measure the CIE L*a*b* coordinates and the reflectance value (Y) of samples on white and black backgrounds. TP, CR and the opalescence parameter (OP) were calculated. Data were statistically analysed using VAF (variance accounting for) coefficient with Cauchy-Schwarz inequality, one-way ANOVA, Tukey's test, Bonferroni correction and Pearson's correlation.Results: T% of some ceramic systems is dependent on the wavelength. The spectral behaviour showed a slight and constant increase in T% up to approximately 550 nm, then some ceramics changed the behaviour as the wavelength gets longer. TP and CR values ranged, respectively, from 16.79 to 21.69 and from 0.52 to 0.64 (r(2) = -0.97). OP values ranged from 3.01 to 7.64.Conclusions: The microstructure of CAD-CAM ceramic systems influenced the optical properties. TP and CR showed a strong correlation for all ceramic systems evaluated. Yet, all ceramics showed some degree of light transmittance.Significance: In addition to shade, this study showed that other optical properties influence on the natural appearance of dental ceramics. (C) 2014 Elsevier Ltd. All rights reserved.