Department of Buccofacial Prostheses, Faculty of Odontology, University Complutense of Madrid, Madrid, Spain.
J Prosthodont. 2019 Mar;28(3):299-304. doi: 10.1111/jopr.12590. Epub 2017 Feb 2.
Studies on the marginal fit of monolithic restorations are limited. This study aimed to evaluate the marginal fit among monolithic zirconia, monolithic lithium disilicate, and conventional metal-ceramic crowns and to compare the buccal and lingual surfaces.
Thirty standardized stainless steel master dies were fabricated (height: 5 mm; convergence: 6°; chamfer: 1 mm). The dies were randomly divided into three groups (n = 10 each) according to the material used to construct the crowns: group 1 (LM): Lava Plus; group 2 (DM): IPS e.max CAD; and group 3 (MC): Metal-ceramic. The crowns were luted in a standard manner onto the stainless steel master dies using conventional glass ionomer cement. The vertical marginal gap of the restorations was evaluated under a scanning electron microscope (SEM) at 500x magnification. One-way ANOVA, Tukey´s HSD test, and Student's paired t test were used to assess the marginal discrepancy among the groups. The cutoff value for statistical significance was set at α = 0.05.
Significant differences among the three groups (p = 0.0001) were recorded. DM group showed the lowest discrepancies (27.95 ± 9.37 μm). Significant differences were observed for the buccal (p = 0.007) and lingual (p = 0.0001) surfaces between the DM group and the other groups.
The accuracy of fit achieved for the three groups was within the range of clinical acceptance. IPS e.max CAD showed the lowest discrepancies.
关于整体式修复体边缘适合性的研究有限。本研究旨在评估整体式氧化锆、整体式锂硅玻璃陶瓷和传统金属烤瓷冠的边缘适合性，并比较颊舌面。
制作 30 个标准化不锈钢主模具（高度：5mm；会聚度：6°；倒角：1mm）。根据用于制作冠的材料，将模具随机分为三组（每组 10 个）：组 1（LM）：Lava Plus；组 2（DM）：IPS e.max CAD；组 3（MC）：金属烤瓷。用传统玻璃离子水门汀以标准方式将冠粘接到不锈钢主模具上。使用扫描电子显微镜（SEM）在 500x 放大倍数下评估修复体的垂直边缘间隙。采用单因素方差分析、Tukey HSD 检验和学生配对 t 检验评估组间边缘差异。统计显著性的截止值设为α=0.05。
三组之间存在显著差异（p=0.0001）。DM 组显示出最低的差异（27.95±9.37μm）。DM 组与其他两组之间的颊面（p=0.007）和舌面（p=0.0001）均存在显著差异。
三组的拟合精度在临床可接受范围内。IPS e.max CAD 显示出最低的差异。
