Objective To obtain the quantitative parameters of tooth preparation for crown based on the 3D scanning and reverse engineering (RE) technique. Methods Tooth 26 in the standard gypsum model was prepared for allceramic crown. The three-dimensional data were acquired by D700 Scanner, which comained prepared tooth, neighbor teeth, antagonist and the intact tooth. The quantitative distribution of tooth reduction amount was analyzed by threedimensional comparison between the prepared and intact tooth. The quantitative values of taper and shoulder width were explored based on the cloud segmentation and extraction. Results By point clouds analysis, the quantitative parameters of tooth preparation (tooth reduction amount, taper and shoulder width) were obtained. Conclusion Based on reverse engineering software, this study establishes a preliminary method to quantify the vital parameters of tooth preparation for crown.%目的 基于三维扫描和逆向工程技术,研究全冠预备体临床评价指标的量化方法,并为专用评价软件的研发建立关键技术路线.方法 在教学用标准牙列石膏模型上,对左侧上颌第一磨牙进行全瓷冠牙体预备,用牙颌模型三维激光扫描仪获取预备前牙冠、预备体代型、邻牙以及对胎牙三维点云数据,通过对预备体及预备前牙冠数据进行点云间三维差异分析,得到牙体预备量的量化分布情况.基于点云分割及特征点云提取分析的方法,在所得截面下进行全冠预备体轴壁倾斜度及肩台宽度的定量表示的研究.结果 通过对点云数据进行处理分析,得到牙体预备量、预备体轴壁倾斜度及肩台宽度的量化指标.结论 本研究应用逆向工程软件,初步建立一种全冠预备体关键评价指标的量化表示方法.
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