Abstract：
The aim of this in vitro study is to compare the performance of digital and conventional methods in the manufacture of single copings in terms of the internal and marginal fit. Twenty-four prefabricated titanium Cone Morse Exact abutments of the lateral anatomical type were used to manufacture 24 lithium disilicate copings in the CAD-CAM Ceramill (n = 12) and heat-press (n = 12) systems. The copings were cemented using a self-adhesive resin cement (RelyX U-200; 3M ESPE) and then cut vertically. The cement line was photographed using an optical microscope at ×100 and ×200 magnification and then the internal and marginal regions were measured. The mean values of fits, for the CAD-CAM and heat-press techniques, respectively, were (μm): angular regions, 81.8 and 75.3; linear regions, 63.1 and 60.1; incisal regions, 171.1 and 114.7; marginal discrepancy, 74.1 and 75.2; and absolute marginal discrepancy, 99.5 and 96.2. MANOVA test showed that there is an effect of the techniques on the regions (p < .05). The effects of laboratories and the interaction between laboratories and techniques on the regions were not statistically significant (p > .05). The techniques evaluated presented clinically acceptable results for the marginal fit. However, the conventional method performed better for the internal fit. RESEARCH HIGHLIGHTS: Scientific evidence regarding the methods of making prosthesis can help the dental professional in decision-making. Digital and conventional methods is both good in the manufacture of single copings in terms of the internal and marginal fit.
摘要：
这项体外研究的目的是比较数字和常规方法在内部和边缘配合方面的性能。在CAD-CAMCeramill（n=12）和热压（n=12）系统中，使用了二十四个预制的钛锥Morse精确基台来制造24个二硅酸锂覆盖物。使用自粘树脂粘固剂(RelyXU-200;3MESPE)粘合该覆盖层,然后垂直切割。使用光学显微镜在X100和X200放大率下拍摄水泥线,然后测量内部和边缘区域。拟合的平均值，对于CAD-CAM和热压技术，分别,were(μm)：角区域，81.8和75.3；线性区域，63.1和60.1；切面区域，171.1和114.7；边际差异，74.1和75.2；和绝对边际差异，99.5和96.2。MANOVA测试表明技术对区域有影响(p<.05)。实验室的影响以及实验室和技术之间的相互作用对区域的影响没有统计学意义（p>.05）。所评估的技术为边缘拟合提供了临床上可接受的结果。然而,传统方法的内部配合效果更好。研究重点：关于制造假体的方法的科学证据可以帮助牙科专业人员进行决策。就内部和边缘配合而言，数字和常规方法在制造单个顶盖方面都很好。
