牙冠延长术模板的计算机辅助设计与制作

Computer aided design and computer aided manufacture of template for crown lengthening

目的:将计算机辅助设计与快速成型技术相结合,应用于牙冠延长术手术模板的设计与制作,初步探索可行的方案。方法:利用三维扫描仪对1位需行牙冠延长术患者的上颌牙列石膏模型进行扫描。遵循龈缘形态的美学原则,结合患者口腔实际情况,对点云数据进行编辑,生成代表龈缘形态的3D曲线。按照曲线位置确定模板区域,通过抽壳等操作获取模板的三维数据模型。最后将数据导入快速成型机,加工出树脂模板。结果:初步实现了牙冠延长术手术模板的计算机辅助设计与制作;提高了术中定位切口的速度和准确性。结论:计算机辅助设计与快速成型技术相结合制作牙冠延长术模板,为科学设计龈缘的位置和形态提供了一种可行的方法。

PURPOSE： To introduce a method applied in computer aided design and computer aided manufacture（CADCAM） of template for crown lengthening.METHODS： Point cloud data of dental stone model of the patient in the plan of crown lengthening surgery was obtained by laser scanning.The following processes were carried out,constructing 3-D curve of the gingiva,drawing template outline on the triangle mesh model,shelling it for 3-D model of template,and transferring the data to rapid prototyping equipment for manufacture.RESULTS： 3-D model of the template was preliminarily accomplished.The resin template was manufactured with rapid prototyping equipment.The fitness between resin template and plaster model was good.CONCLUSIONS： This method,as an integrated procedure including data acquisition,3-D computer modeling and fabrication by rapid prototyping,is feasible to implement CAD-CAM of template for crown lengthening.