Igiel Christopher, Weyhrauch Michael, Mayer Barbara, Scheller Herbert, Lehmann Karl Martin
Int J Esthet Dent. 2018;13(1):110-119.
To optimize the esthetics of ceramic restorations, it is important to determine accurately the effects of various parameters on the final color of the restoration. However, there is a lack of information on what determines the color of translucent feldspathic veneers formed using ceramics such as Vita Mark II. The aim of this study was to evaluate the effects of the ceramic layer thickness, cement color, and abutment tooth color on the color of the feldspathic ceramic veneer restoration.
A total of 30 all-ceramic monolithic veneers (Vita Mark II) were fabricated using a CAD/CAM system. The crowns were divided into three groups of differing ceramic thickness (0.4-, 0.7-, and 1.0-mm thick). Each type of crown was seated on six different-colored abutment teeth (1M1 [reference], 1M2, 2M2, 3M2, 4M2, and 5M2) using seven different try-in paste colors. The color of the resulting restoration was evaluated using spectrophotometry with a spot-measurement device (Vita Easyshade Advance 4.0). Color data are expressed in CIE Lab* system coordinates, and color differences ΔE relative to the reference tooth were calculated and analyzed using one-way analysis of variance (ANOVA) with the Bonferroni post hoc test at α = 0.05.
The color difference ΔE of the feldspathic all-ceramic veneer system was significantly affected by the thickness of the ceramic layer, the cement color, and the abutment tooth color (P < 0.05). The smallest values of ΔE compared with the reference color were found when try-in pastes shade -3 was used. As the thickness of the ceramic layer increased, a significant decrease in ΔE was found. As the color of the abutment tooth varied from light to dark, a significant increase was found in ΔE.
The thickness of the ceramic layer, the cement color, and the abutment tooth color significantly affected the color of the resulting CAD/CAM feldspathic ceramic veneer restoration.
为优化陶瓷修复体的美学效果，准确确定各种参数对修复体最终颜色的影响非常重要。然而，关于使用如维他马克II等陶瓷制成的半透明长石质贴面颜色的决定因素，目前缺乏相关信息。本研究的目的是评估陶瓷层厚度、粘结剂颜色和基牙颜色对长石质陶瓷贴面修复体颜色的影响。
使用计算机辅助设计/计算机辅助制造（CAD/CAM）系统制作了30个全瓷整体贴面（维他马克II）。牙冠分为三组，陶瓷厚度不同（0.4毫米、0.7毫米和1.0毫米厚）。每种类型的牙冠使用七种不同的试戴糊剂颜色，安装在六种不同颜色的基牙上（1M1[参考色]、1M2、2M2、3M2、4M2和5M2）。使用点测量装置（维他易美加4.0）通过分光光度法评估所得修复体的颜色。颜色数据以CIE Lab*系统坐标表示，并计算相对于参考牙的颜色差异ΔE，使用单因素方差分析（ANOVA）和α = 0.05的Bonferroni事后检验进行分析。
长石质全瓷贴面系统的颜色差异ΔE受陶瓷层厚度、粘结剂颜色和基牙颜色的显著影响（P < 0.05）。使用试戴糊剂色号-3时，与参考颜色相比的ΔE值最小。随着陶瓷层厚度的增加，ΔE显著降低。随着基牙颜色从浅到深变化，ΔE显著增加。
陶瓷层厚度、粘结剂颜色和基牙颜色显著影响所得CAD/CAM长石质陶瓷贴面修复体的颜色。
