Alouch Ehab, Karkoutly Mawia, Teriaky Omar
Department of Removable Prosthodontics, Damascus University, Damascus, Syrian Arab Republic.
Department of Pediatric Dentistry, Damascus University, Damascus, Syrian Arab Republic.
Clin Exp Dent Res. 2024 Apr;10(2):e869. doi: 10.1002/cre2.869.
This study aimed to compare the color change of computer-aided design (CAD)/computer-aided manufacturing (CAM) polymethyl methacrylate (PMMA) denture teeth and conventional acrylic teeth after immersion in three staining beverages (coffee, red tea, and cola) for a day, 7 days, and 30 days.
Group 1: Conventional acrylic teeth (n = 32). Group 2: Milled CAD/CAM teeth out of PMMA disc (n = 32). The specimens of each material were further divided into four subgroups: (1) Control group, distilled water (n = 16). (2) Red tea solution (n = 16). (3) Coffee solution (n = 16). (4) Cola (n = 16). The color change ( ) was assessed using a spectrophotometer at four time points: at the baseline (t ), on the 1st day (t ), on the 7th day (t ), and the 30th day (t ) of immersion. Kolmogorov-Smirnov test was applied, followed by performing independent samples t test, one-way analysis of variance and post-hoc Tukey tests to compare the color change values at different time points.
The mean score of NBS values of the coffee solution indicates perceivable color change at the end of the 30th day in the conventional acrylic teeth group. It was 0.843 ± 0.395 at t , then increased to 1.017 ± 0.477 at t and to 2.259 ± 1.059 at t . There is a statistically significant difference (p < 0.05) in color change values between both tooth types at the end of the 30th day of immersion in red tea solution and a statistically significant difference at the end of the 7th day (p < 0.05) and the 30th day (p < 0.05) of immersion in coffee solution.
CAD/CAM PMMA teeth are more color stable than conventional acrylic teeth after 30 days of immersion in coffee and red tea solution.
本研究旨在比较计算机辅助设计（CAD）/计算机辅助制造（CAM）聚甲基丙烯酸甲酯（PMMA）义齿牙和传统丙烯酸牙在三种染色饮料（咖啡、红茶和可乐）中浸泡1天、7天和30天后的颜色变化。
第1组：传统丙烯酸牙（n = 32）。第2组：由PMMA盘铣削而成的CAD/CAM牙（n = 32）。每种材料的样本进一步分为四个亚组：（1）对照组，蒸馏水（n = 16）。（2）红茶溶液（n = 16）。（3）咖啡溶液（n = 16）。（4）可乐（n = 16）。在四个时间点使用分光光度计评估颜色变化（ ）：浸泡的基线（t ）、第1天（t ）、第7天（t ）和第30天（t ）。应用柯尔莫哥洛夫-斯米尔诺夫检验，随后进行独立样本t检验、单因素方差分析和事后Tukey检验，以比较不同时间点的颜色变化值。
咖啡溶液的NBS值平均得分表明，在第30天结束时，传统丙烯酸牙组有可察觉的颜色变化。在t 时为0.843±0.395，在t 时增加到1.017±0.477，在t 时增加到2.259±1.059。在红茶溶液中浸泡30天结束时，两种牙类型的颜色变化值存在统计学显著差异（p < 0.05），在咖啡溶液中浸泡第7天（p < 0.05）和第30天（p < 0.05）结束时也存在统计学显著差异。
在咖啡和红茶溶液中浸泡30天后，CAD/CAM PMMA牙比传统丙烯酸牙颜色更稳定。
