Post-Graduate Program in Oral Science, Division of Restorative Dentistry, Federal University of Santa Maria (UFSM).
Post-Graduate Program in Clinical Dentistry, Federal University of Santa Catarina (UFSC).
Braz Dent J. 2024 Oct 28;35:e245995. doi: 10.1590/0103-6440202405995. eCollection 2024.
The purpose of this study was to investigate the influence of the color of positioning guides on the CIELab* color coordinates of ceramic, resin composite and bovine tooth surfaces measured by a clinical spectrophotometer. Positioning guides (n=10) in different colors (translucent, purple, yellow, green and, blue) were made for each surface (ceramic, resin composite and bovine tooth). The CIELab* color coordinates were measured with the positioning guides and with no positioning guide (control group). The ΔL*, Δa*, Δb*, ΔEab, and ΔE00 were calculated between the control group and the different groups. The CIELab color coordinates were analyzed by one-way ANOVA followed by the post-hoc Tukey test (α=0.05). Color differences were interpreted using the 50:50% perceptibility and acceptability visual thresholds. Positioning guides with different colors presented significant differences for all surfaces and color coordinates. ΔE*ab, and ΔE00 mean values for all surfaces and positioning guide colors exceeded the acceptability visual thresholds, except for the bovine tooth surface measured with the green positioning guide. The shade measurement was affected by the color of the positioning guides regardless of the surface that was evaluated.
本研究旨在探讨定位导板颜色对临床分光光度计测量的陶瓷、树脂复合材料和牛牙表面的 CIELab颜色坐标的影响。为每个表面（陶瓷、树脂复合材料和牛牙）制作了不同颜色（半透明、紫色、黄色、绿色和蓝色）的定位导板（n=10）。使用定位导板和无定位导板（对照组）测量 CIELab颜色坐标。计算对照组和不同组之间的 ΔL*、Δa*、Δb*、ΔEab 和 ΔE00。采用单因素方差分析（α=0.05）后进行 Tukey 事后检验对 CIELab颜色坐标进行分析。使用 50:50%可察觉性和可接受性视觉阈值解释颜色差异。对于所有表面和颜色坐标，不同颜色的定位导板均呈现出显著差异。除了用绿色定位导板测量的牛牙表面外，所有表面和定位导板颜色的 ΔE*ab 和 ΔE00 平均值均超过了可接受性视觉阈值。无论评估的表面如何，定位导板的颜色都会影响色调测量。
