Xia Yanlin, Zhu Jiakang, Wang Wenxiang, Liang Shanshan, Huang Cui
State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, School & Hospital of Stomatology, Wuhan University, PR China.
State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, School & Hospital of Stomatology, Wuhan University, PR China; Clinical Research Center of Shaanxi Province for Dental and Maxillofacial Diseases, College of Stomatology, Xi'an Jiaotong University, PR China.
J Dent. 2025 Sep;160:105902. doi: 10.1016/j.jdent.2025.105902. Epub 2025 Jun 13.
This study aimed to derive predictive formulas for the final colour of restorations for discoloured teeth using zirconia veneers.
Coping thickness and translucency of zirconia, background colour, and luting cement shade were assessed. Shapiro-Wilk, ANOVA, paired t-tests, independent t-tests, Tukey's test, and Automatic linear modeling (p < 0.05) were employed to develop a clinically practical method for predicting the colour difference (ΔE) between sample combinations (SCs) and the shade guides. ΔE values were evaluated against perceptibility (PT = 2.6) and acceptability (AT = 5.5) thresholds.
Most discoloured teeth could be restored for A2 or A3 target shade. Using 1.5 mm CAD-CAM zirconia ceramic can achieve PT when the background colour is ND5, ND7, ND8. ΔE between the 1.5 mm LT SCs and the A2 shade guide is mostly within the AT range. ΔE between SCs and A2 shade guide showed a positive association with ND9 and negative associations with ND4, ND5, 1.5 mm, 1.0 mm, LT, and BL (p < 0.001). ΔE between SCs and A3 shade guide correlated positively with ND4, ND5, and ND9 but negatively with 1.5 mm, 1.0 mm, and LT (p < 0.001).
Each factor differentially influenced the final colour, with background colour being the most significant, followed by coping thickness. Two formulas can be used to predict ΔE between the restoration for discoloured teeth using zirconia veneers and the target shade (A2 or A3).
The proposed formulas facilitate colour prediction in zirconia veneers for discoloured teeth, enhancing clinical aesthetic outcomes.
本研究旨在推导使用氧化锆贴面修复变色牙最终颜色的预测公式。
评估氧化锆的基底厚度和透明度、背景颜色以及粘结剂色度。采用夏皮罗-威尔克检验、方差分析、配对t检验、独立t检验、图基检验和自动线性建模（p<0.05）来开发一种临床实用方法，以预测样本组合（SCs）与比色板之间的颜色差异（ΔE）。根据可察觉性（PT = 2.6）和可接受性（AT = 5.5）阈值评估ΔE值。
大多数变色牙可修复至A2或A3目标色度。当背景颜色为ND5、ND7、ND8时，使用1.5 mm CAD-CAM氧化锆陶瓷可达到可察觉性。1.5 mm LT样本组合与A2比色板之间的ΔE大多在可接受范围内。样本组合与A2比色板之间的ΔE与ND9呈正相关，与ND4、ND5、1.5 mm、1.0 mm、LT和BL呈负相关（p<0.001）。样本组合与A3比色板之间的ΔE与ND4、ND5和ND9呈正相关，但与1.5 mm、1.0 mm和LT呈负相关（p<0.001）。
各因素对最终颜色的影响各不相同，背景颜色影响最为显著，其次是基底厚度。可使用两个公式预测使用氧化锆贴面修复变色牙与目标色度（A2或A3）之间的ΔE。
所提出的公式有助于预测氧化锆贴面修复变色牙的颜色，提高临床美学效果。
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