Vichi Alessandro, Carrabba Michele, Paravina Rade, Ferrari Marco
Department of Medical Biotechnologies, University of Siena, Siena, Italy.
J Esthet Restor Dent. 2014 Jul-Aug;26(4):224-31. doi: 10.1111/jerd.12105. Epub 2014 Jun 29.
To compare translucency of the ceramic materials (CEREC CAD/CAM).
Fifteen ceramic materials for CEREC CAD/CAM system were evaluated: IPS e.max HT/LT/MO, ZirCAD, Empress HT/LT; VITA Mark II, VITA AL; VITA YZ, VITA In-Ceram Spinell/Alumina/Zirconia; and Sirona InCoris AL; Sirona InCoris ZI/TZI. Specimens (0.5-mm and 1.0-mm thick; n = 10 each material) were cut from commercial blocks using a water-cooled diamond saw. Contrast ratio (CR = YB /YW ) was measured using a spectrophotometer with an integrating sphere. Kruskal-Wallis one way analysis of variance was performed followed by Dunn's multiple test for post-hoc.
CR varied from 0.35 to 1.00 and from 0.48 to 1.00 for 0.5 mm and 1.0 mm thicknesses, respectively. CR increased in the following order: IPS e.max HT (most translucent-least opaque), IPS Empress HT, VITA Mark II, IPS Empress LT, IPS e.max LT, In-Ceram Spinell, IPS e.max MO, VITA YZ, InCoris TZI, IPS e.max ZirCAD, InCoris ZI, In-Ceram Alumina, VITA AL, InCoris AL, and In-Ceram Zirconia (least translucent-most opaque).
The null hypothesis has been rejected because tested materials exhibited a wide range of CR. Translucency needs to be taken into account in different clinical situations, including considerations associated with thickness of restoration and/or particular layers.
A wide range of translucency was identified for the ceramic materials tested. This variability has to be taken into account for the selection of the materials in different clinical situations also related to the thickness clinically required.
比较陶瓷材料（CEREC CAD/CAM）的半透明度。
对用于CEREC CAD/CAM系统的15种陶瓷材料进行评估：IPS e.max HT/LT/MO、ZirCAD、Empress HT/LT；VITA Mark II、VITA AL；VITA YZ、VITA In-Ceram Spinell/氧化铝/氧化锆；以及Sirona InCoris AL；Sirona InCoris ZI/TZI。使用水冷金刚石锯从商用块材上切割出样本（厚度为0.5毫米和1.0毫米；每种材料n = 10）。使用带积分球的分光光度计测量对比度（CR = YB /YW）。进行Kruskal-Wallis单向方差分析，随后进行Dunn多重检验用于事后分析。
对于0.5毫米和1.0毫米厚度的样本，CR分别在0.35至1.00以及0.48至1.00之间变化。CR按以下顺序增加：IPS e.max HT（最半透明 - 最不 opaque）、IPS Empress HT、VITA Mark II、IPS Empress LT、IPS e.max LT、In-Ceram Spinell、IPS e.max MO、VITA YZ、InCoris TZI、IPS e.max ZirCAD、InCoris ZI、In-Ceram氧化铝、VITA AL、InCoris AL和In-Ceram氧化锆（最不半透明 - 最opaque）。
由于测试材料表现出广泛的CR范围，原假设被拒绝。在不同临床情况下需要考虑半透明度，包括与修复体厚度和/或特定层相关的因素。
在所测试的陶瓷材料中发现了广泛的半透明度范围。在不同临床情况下选择材料时必须考虑这种变异性，这也与临床所需厚度有关。
