Objective: This study aims to compare the marginal accuracy of single crowns fabricated using self-curing resin, Luxatemp, and computer aided design/computer aided manufacturing (CAD/CAM) methods in clinical application.
Methods: A total of 30 working dies, which were obtained from 30 clinical teeth prepared with full crown as standard, were created and made into 30 self-curing resin, Luxatemp, and CAD/CAM single crowns. The restorations were seated on the working dies, and stereomicroscope was used to observe and measure the thickness of reference points. One-way analysis of variance, which was performed using SPSS 19.0 software package, compared the marginal gap widths of self-curing resin, Luxatemp, and CAD/CAM provisional crowns.
Results: The mean marginal gap widths of the fabricated self-curing resin, Luxatemp, and CAD/CAM were (179.06±33.24), (88.83±9.56), and (43.61±7.27) μm, respectively. A significant difference was observed among the three provisional crowns (P<0.05).
Conclusions: The marginal gap width of CAD/CAM provisional crown was lower than that of the self-curing resin and Luxatemp. Thus, the CAD/CAM provisional crown offers a better remediation effect in clinical application.
目的 比较自凝树脂、Luxatemp与计算机辅助设计与制造（CAD/CAM）树脂暂时冠修复体的边缘密合度差异。 方法 按全冠牙体制备标准预备牙体30个，取模并灌注石膏模型后，分别制作自凝树脂、Luxatemp与CAD/CAM树脂暂时冠各30个，将其就位于石膏模型上。通过体式显微镜，对利用硅橡胶复制技术得到的暂时冠与石膏模型间的边缘间隙宽度代型进行测量，计算各组30个样本边缘间隙的平均值。采用SPSS 19.0软件包对实验数据进行单因素方差分析。 结果 自凝树脂、Luxatemp与CAD/CAM树脂暂时冠边缘间隙平均值分别为（179.06±33.24）、（88.83±9.56）和（43.61±7.27） μm。CAD/CAM树脂暂时冠边缘间隙显著小于自凝树脂和Luxatemp暂时冠（P< 0.05），自凝树脂暂时冠边缘间隙显著大于Luxatemp与CAD/CAM树脂暂时冠（P<0.05）。 结论 CAD/CAM树脂暂时冠边缘密合度显著优于自凝树脂和Luxatemp暂时冠， CAD/CAM具有较高的临床应用价值。.
Keywords: computer aided design/computer aided manufacturing methods; marginal adaptation; provisional restoration.