非接触式三维图像检测系统测量牙齿咬合面磨损的初步研究

目的　使用新研制的非接触式三维图像检测系统对健康人牙齿咬合面的磨损情况进行定量测定。方法　选择 32名牙列完整的健康中老年人 5年前后的牙颌模型 ,用统一方法确定个体参照平面和上颌第一恒磨牙测量范围 ,用非接触式三维图像检测系统测量研究对象 5年内上颌第一恒磨牙咬合面的磨损量和平均磨损速度。结果　 5年内上颌第一恒磨牙咬合面的磨损情况 :以高度平均值变化为指标 ,平均磨损量为 0 2 93mm ,平均每年磨损速度为 0 0 5 9mm ;以体积变化为指标 ,平均磨损量为 97 881mm3 ,平均磨损速度为 19 5 76mm3 /年。结论　非接触式三维图像检测系统及相关的必要设置 ,可作为测量健康人牙齿磨损情况的有效工具。其个别设置条件尚待进一步改进

Preliminary study of tooth measured by a noncontact 3D image survey system

OBJECTIVE: To perform the quantitative study of tooth occlusal surface wear by a noncontact 3D image survey system. METHODS: Thirty-two old people's complete dental casts in five years which had normal occlusion were studied. The same way was used to determine the individual reference surface, and the range of the maxillary first molar occlusal surface was delimitted by the unite regulation. Then the quantity of wear in five years and wear rate of maxillary first molar occlusal surface were measured by the noncontact 3D image survey system. RESULTS: Wear of maxillary first molar occlusal surfaces was as follows: the mean height loss was 0.293 mm in five years and the mean wear rate was 0.059 mm/year; the mean volume loss was 97.881 mm(3) in five years and the mean wear rate was 19.576 mm(3)/year. CONCLUSIONS: Under the necessary conditions, the noncontact 3D image survey system is an effective method to measure the wear of dental occlusal surface, but some set-up conditions need to be improved further.