贴面修复用陶瓷的遮色性能。

Masking properties of ceramics for veneer restorations.

机构信息

Fellow, Implant Periodontal Prosthodontics Fellowship Program, Department of Periodontics, University of Maryland School of Dentistry, Baltimore, Md.

Clinical Professor, Department of Restorative Sciences and Biomaterials, Boston University Henry M. Goldman School of Dental Medicine, Boston, Mass.

出版信息

J Prosthet Dent. 2017 Oct;118(4):517-523. doi: 10.1016/j.prosdent.2016.12.003. Epub 2017 Mar 22.

DOI:10.1016/j.prosdent.2016.12.003

PMID:28341059

Abstract

STATEMENT OF PROBLEM

The translucency and opacity of ceramics play a significant role in emulating the natural color of teeth, but studies of the masking properties and limitations of dental ceramics when used as monolayer restorations are lacking.

PURPOSE

The purpose of this in vitro study was to determine the translucency of 6 materials used for veneer restorations by assessing their translucency parameters (TPs), contrast ratios (CRs), and potential to mask dark tooth colors.

MATERIAL AND METHODS

Ten square- or disk-shaped specimens (0.5-mm thickness, shade A2) were fabricated from Vitablocks Mark II (VMII; Vita Zahnfabrik), IPS e.max CAD LT (EMXC LT; Ivoclar Vivadent AG), IPS e.max CAD HT (EMXC HT; Ivoclar Vivadent AG), IPS Empress CAD LT (EMP LT; Ivoclar Vivadent AG), IPS e.max Press LT (EMXP LT; Ivoclar Vivadent AG), and CZR (CZR; Kuraray Noritake Dental Inc). Their luminance (Y) values over black and over white tiles were measured, followed by their color (CIELab) over black tiles and white tiles and shaded A2 (control group), A3.5, A4, and B4 acrylic resin blocks. All measurements were performed using a spectrophotometer in 2 different areas on each specimen. Then CRs, TPs, and color differences (over shaded backgrounds) were determined. Data were subjected to 1-way and 2-way ANOVA (α=.05) for analysis.

RESULTS

Mean CR values of EMXP LT were significantly higher than those of the other tested materials, whereas VMII and EMXC HT had the lowest values (P<.001). Mean TP values over black and over white backgrounds of VMII and EMXC HT were significantly higher than those of the other tested materials, while EMXP LT and EMXC LT revealed the lowest values (P<.001). Background shade A4 displayed the highest mean effect (expressed in ΔE* values) on the color of the ceramic materials, whereas shade B4 demonstrated the lowest mean background effect (P<.001).

CONCLUSIONS

Significant differences in translucency among the tested ceramics were revealed (P<.001). The EMXC LT and EMXP LT groups were the least translucent under the conditions of this study (P<.001). All tested ceramics exhibited poor masking properties against the A4 background. The color differences of most tested ceramics were more acceptable when tested against the B4 background (ΔE*≤3.3).

摘要

问题陈述

陶瓷的半透明度和不透明度在模拟牙齿自然颜色方面起着重要作用，但缺乏关于牙科陶瓷在单层修复体中遮色性能和局限性的研究。

目的

本体外研究的目的是通过评估 6 种用于贴面修复的材料的透光参数（TP）、对比率（CR）和对深色牙齿颜色的遮色潜力，来确定它们的半透明度。

材料和方法

从 Vitablocks Mark II（VMII；Vita Zahnfabrik）、IPS e.max CAD LT（EMXC LT；Ivoclar Vivadent AG）、IPS e.max CAD HT（EMXC HT；Ivoclar Vivadent AG）、IPS Empress CAD LT（EMP LT；Ivoclar Vivadent AG）、IPS e.max Press LT（EMXP LT；Ivoclar Vivadent AG）和 CZR（CZR；Kuraray Noritake Dental Inc）中制作出 10 个方形或圆盘形试件（厚度 0.5mm，A2 色）。测量它们在黑色和白色瓷砖上的亮度（Y）值，然后在黑色和白色瓷砖上以及 A2（对照组）、A3.5、A4 和 B4 丙烯酸树脂块上测量它们的颜色（CIELab）。使用分光光度计在每个试件的 2 个不同区域进行所有测量。然后确定 CR、TP 和（在有色背景上的）颜色差异。数据通过 1 因素和 2 因素方差分析（α=.05）进行分析。

结果

EMXP LT 的平均 CR 值明显高于其他测试材料，而 VMII 和 EMXC HT 的 CR 值最低（P<.001）。VMII 和 EMXC HT 对黑色和白色背景的平均 TP 值明显高于其他测试材料，而 EMXP LT 和 EMXC LT 的 TP 值最低（P<.001）。背景色 A4 对陶瓷材料颜色的平均影响（以ΔE*值表示）最高，而背景色 B4 的平均背景效果最低（P<.001）。