不同厚度的 4 种牙科 CAD-CAM 整体修复材料的颜色准确性和偏差的定量分析：一项体外研究。
Quantitative analysis of color accuracy and bias in 4 dental CAD-CAM monolithic restorative materials with different thicknesses: An in vitro study.
机构信息
Postgraduate student, Department of Oral Implantology, Peking University School and Hospital of Stomatology, Beijing, China.
Lecturer, Department of Oral Implantology, Peking University School and Hospital of Stomatology, Beijing, China.
出版信息
J Prosthet Dent. 2022 Jul;128(1):92.e1-92.e7. doi: 10.1016/j.prosdent.2022.04.020. Epub 2022 May 18.
STATEMENT OF PROBLEM
Computer-aided design and computer-aided manufacturing (CAD-CAM) monolithic restorative materials have become a popular option because of advantages such as convenience and efficiency. However, studies that quantitatively analyzed their color accuracy and bias are lacking.
PURPOSE
The purpose of this in vitro study was to evaluate the color accuracy and bias of 4 CAD-CAM monolithic restorative materials with different thicknesses by using the CIELab color space.
MATERIAL AND METHODS
Four types of dental CAD-CAM monolithic restorative materials in shade A2, lithium disilicate glass-ceramic (IPS e.max CAD), infiltrated ceramic (VITA Enamic), resin-nano ceramic (LAVA Ultimate), and polymethyl methacrylate (Telio CAD), were prepared as 12×12-mm specimens of 10 different thicknesses (from 0.5 to 5.0 mm) (N=200, n=5). After polishing with SiC P1500-grit, CIELab color coordinate parameters of the specimens were measured with a spectrophotometer (VITA Easyshade V). The color accuracy and bias were described by ΔE, ΔL∗, Δa∗, and Δb∗ in the CIELab color space, and the data were analyzed by using a 2-way ANOVA, post hoc Tukey-Kramer test, and the t test (α=.05).
RESULTS
The ΔE, ΔL∗, Δa∗, and Δb∗ were significantly influenced by material type and thickness (P<.001). Specimens at a thickness of 0.5 mm represented the maximum ΔE. The minimum ΔE was observed at a thickness of 2.0 mm for LAVA Ultimate, 1.5 mm for VITA Enamic and Telio CAD, and 4.0 mm for IPS e.max CAD. The ΔE of all specimens significantly exceeded the 50:50% acceptability threshold (1.8 unit) (P<.001). LU exhibited higher ΔE, Δa∗, and Δb∗ than the other 3 materials in all thickness expect for 0.5 mm. For color bias, the ΔE was more influenced by Δb∗ and ΔL∗ than Δa∗.
CONCLUSIONS
The color accuracy and bias were significantly affected by material type and thickness. The color inaccuracy of the tested materials was statistically significant and clinically perceptible. Improved clinical outcomes may be expected from the 1.5-mm- to 2.0-mm-thick restorations.
问题陈述
计算机辅助设计和计算机辅助制造（CAD-CAM）整体修复材料因其方便和高效等优点成为一种流行的选择。然而，缺乏定量分析其颜色准确性和偏差的研究。
目的
本体外研究的目的是使用 CIELab 颜色空间评估 4 种不同厚度的 CAD-CAM 整体修复材料的颜色准确性和偏差。
材料和方法
制备 A2 色调的 4 种牙科 CAD-CAM 整体修复材料（锂硅玻璃陶瓷[IPS e.max CAD]、渗透陶瓷[VITA Enamic]、树脂纳米陶瓷[LAVA Ultimate]和聚甲基丙烯酸甲酯[Telio CAD]）的 12×12-mm 试件，厚度为 10 个不同厚度（从 0.5 到 5.0 毫米）（N=200，n=5）。用 SiC P1500 粒度抛光后，用分光光度计（VITA Easyshade V）测量试件的 CIELab 颜色坐标参数。使用 2 因素方差分析、事后 Tukey-Kramer 检验和 t 检验（α=.05）描述 CIELab 颜色空间中的颜色准确性和偏差。
结果
材料类型和厚度显著影响 ΔE、ΔL∗、Δa∗ 和 Δb∗（P<.001）。厚度为 0.5 毫米的试件代表最大 ΔE。LAVA Ultimate 的最小 ΔE 出现在厚度为 2.0 毫米处，VITA Enamic 和 Telio CAD 的最小 ΔE 出现在厚度为 1.5 毫米处，IPS e.max CAD 的最小 ΔE 出现在厚度为 4.0 毫米处。所有试件的 ΔE 均显著超过 50:50%可接受性阈值（1.8 单位）（P<.001）。在所有厚度（0.5 毫米除外）下，LU 的 ΔE、Δa∗ 和 Δb∗ 均高于其他 3 种材料。对于颜色偏差，ΔE 受 Δb∗ 和 ΔL∗ 的影响大于 Δa∗。
结论
材料类型和厚度显著影响颜色准确性和偏差。测试材料的颜色不准确性具有统计学意义和临床可察觉性。从 1.5 毫米到 2.0 毫米厚的修复体可能会产生更好的临床效果。
Zotero 插件