前牙唇面微观纹理的测量技术研究

Study on measuring method for surface micromorphology of human incisor

目的开发小尺度三维形貌测试系统,测量前牙唇面的天然纹理特征,为个性化牙齿修复技术提供实用数据。方法结合体视显微镜及三维数字图像相关方法,研制适用于小尺度物体三维形貌测量的测试系统及软件,评价系统测量精度,测量人体上颌左侧侧切牙唇面的三维形貌特征。结果在17 mm×12 mm的视野范围下,测试系统的精度在面内为0.6μm,离面为5.4μm。测得牙列唇面两条横纹的物理尺寸,其中,长横纹深度83μm,长度5.28 mm;短横纹深度41μm,长度4.24 mm,两条横纹的间距2.85 mm。结论小尺度三维形貌测试系统可以精确测量牙唇面的微观纹理特征。

Objective To develop a microscopic 3D morphology testing system used for measuring the natural texture of human incisor,and provide practical data for the individualized technique used in dental restoration.Methods Based on microscope and digital image correlation（DIC）,a microscopic 3D morphology testing system with its software was developed.The precision of this system was then evaluated,and the characterization of the 3D surface morphology for human incisor was measured by the system.Results Within the field of view（FOV） of 17 mm×12 mm,the accuracy of in-plane displacement was estimated as 0.6 μm,while that of out-of-plane displacement was 5.4 μm.The dimension of horizontal grooves on the labial surface of incisor was determined,where the depth and length for the long groove were 83 μm and 5.28 mm,respectively;the depth and length for the short groove were 40 μm and 4.24 mm,respectively,and the space between the two grooves was 2.85 mm.Conclusions The microscopic 3D morphology testing system is an effective instrument for measuring the surface morphology of human incisors accurately.