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首页> 外文期刊>European Journal of Dentistry >Color stability and marginal integrity of interim crowns: An in vitro study
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Color stability and marginal integrity of interim crowns: An in vitro study

机译：临时牙冠的颜色稳定性和边缘完整性：一项体外研究

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Objective: 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. Materials and Methods: 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 (n = 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). Results: 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. Conclusions: 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.
机译：目的：许多商业牙科材料被用于制造临时修复体。这项研究旨在比较四种不同的临时冠材料的颜色稳定性和边缘完整性。材料和方法：准备一个牙龈右上颌中切牙，进行全瓷全覆盖修复。使用四种不同的材料（n = 9）在母模上总共制作了36个冠状试样。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）和双丙烯酸树脂双固化复合材料（TempSpan）。通过在分光光度计中将其浸入浓茶溶液中之前和之后以分光光度计测量其颜色为Commission Internationale de l'Eclairage L * a * b *来计算每个样品的颜色变化ΔE。使用体视显微镜在×40的四个参考点测量边缘间隙。单向方差分析和Tukey多重比较检验用于确定四组之间的任何统计学显着性差异（α= 0.05）。结果：成功CD在所有测试材料中均显示出最大的颜色变化（7.7），而在其他三种材料之间未发现显着差异。 TempSpan显示出最大的边际间隙形成（430.15μm），而其他三种材料之间没有发现显着差异。结论：双丙烯酸树脂复合材料在临床上表现出明显的颜色变化，而PMMA材料表现出优异的颜色稳定性。与PMMA和冷固化双丙烯酸树脂材料相比，双重固化中间材料显示出明显更高的边际差异。 CAD-CAM PMMA材料表现出最佳的颜色稳定性和边缘完整性。

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