Elagra Marwa I, Rayyan Mohammad R, Alhomaidhi Maisam M, Alanaziy Areej A, Alnefaie Mona O
Department of Prosthodontic, Riyadh Colleges of Dentistry and Pharmacy, Riyadh, Saudi Arabia.
Department of Restorative Dentistry, Riyadh Colleges of Dentistry and Pharmacy, Riyadh, Saudi Arabia.
Eur J Dent. 2017 Jul-Sep;11(3):330-334. doi: 10.4103/ejd.ejd_66_17.
Many commercial dental materials are used to fabricate interim restorations. This study aimed to compare the color stability and the marginal integrity of four different interim crown materials.
An ivorine right maxillary central incisor was prepared for a full coverage all-ceramic restoration. A total of 36 specimens in the form of crowns were fabricated on the master die using four different materials ( = 9); Polymethyl methacrylate (PMMA) resin (TrimPLUS), PMMA computer-aided design, and computer-aided manufacturing (CAD-CAM) blocks (Ceramill TEMP), cold cure bis-acryl resin (Success CD), and bis-acryl resin dual-cure composite (TempSpan). Color change ΔE for each sample was calculated by measuring its color as Commission Internationale de l'Eclairage L* a* b* with a spectrophotometer before and after immersing in a concentrated tea solution for 7 days. Marginal gap was measured at four reference points using stereomicroscope at ×40. One-way ANOVA and the Tukey multiple comparisons test were used to determine any statistically significant difference between the four groups, (α = 0.05).
Success CD showed significantly the greatest color change (7.7) among all the tested materials, while no significant difference was found between the other three materials. TempSpan showed significantly the highest marginal gap formation (430.15 μm), while no significant difference was found between the three other materials.
Bis-acryl resin composite materials demonstrated clinically noticeable change in color while PMMA materials demonstrated superior color stability. Dual cure interim materials exhibited significantly higher marginal discrepancy in comparison to PMMA and cold cure bis-acrylic resin materials. CAD-CAM PMMA material exhibited the best color stability and marginal integrity.
许多商用牙科材料用于制作临时修复体。本研究旨在比较四种不同临时冠材料的颜色稳定性和边缘完整性。
制备一颗象牙质右上颌中切牙以进行全瓷覆盖修复。使用四种不同材料（每种材料9个样本）在主模型上制作总共36个冠样本；聚甲基丙烯酸甲酯（PMMA）树脂（TrimPLUS）、PMMA计算机辅助设计和计算机辅助制造（CAD-CAM）块（Ceramill TEMP）、冷固化双丙烯酸树脂（Success CD）和双丙烯酸树脂双重固化复合材料（TempSpan）。通过用分光光度计在浸入浓茶溶液7天前后测量每个样本的国际照明委员会Lab*颜色值来计算每个样本的颜色变化ΔE。使用×40体视显微镜在四个参考点测量边缘间隙。采用单因素方差分析和Tukey多重比较检验来确定四组之间是否存在任何统计学上的显著差异（α = 0.05）。
在所有测试材料中，Success CD显示出显著最大的颜色变化（7.7），而其他三种材料之间未发现显著差异。TempSpan显示出显著最高的边缘间隙形成（430.15μm），而其他三种材料之间未发现显著差异。
双丙烯酸树脂复合材料在临床上显示出明显的颜色变化，而PMMA材料显示出更好的颜色稳定性。与PMMA和冷固化双丙烯酸树脂材料相比，双重固化临时材料表现出显著更高的边缘差异。CAD-CAM PMMA材料表现出最佳的颜色稳定性和边缘完整性。
