中文摘要：

目的探讨基于位相测量轮廓术（phase measuring profilometry, PMP）原理的面部轮廓三维彩色成像系统（DSC-2型）成像的精确度及临床实用性。方法使用DSC-2型面部三维成像照相机进行实际拍摄检验，测量规则几何条纹宽度并在石膏头像模型表面确定彩色标志点，定义并测量15项测量项目。对比3名医师两次计算机三维测量结果与两次实物测量结果之间的差异。结果几何条纹宽度的三维测量均值为19．5mm，与实物测量结果（20mm）比较，差异无统计学意义（P〉0．05）。石膏头像上15项测量项目的计算机三维测量结果与实物测量结果比较，差异无统计学意义（P〉0．05），不同医师测量结果的差异无统计学意义（P〉0．05）。结论基于位相轮廓术的面部轮廓三维彩色成像系统可为准确评估和预测正畸疗效提供一种可靠的方法。

英文摘要：

Objective Three-dimensional （3-D） facial images are very useful for orthodontic diagnosis. Three-dimensional facial imaging system （DSC-2） based on phase measuring profilometry （PMP） was used to obtain images and tested for accuracy. Methods Geometric strips （20 mm in width） was used to test the accuracy of the obtained images. Three-dimensional images of plaster head model with marker of 5 mm × 5 mm were taken by DSC-2 three-dimensional facial imag ing system. The difference of measurements was compared between beth methods. Measurements were repeated twice by three different doctors. Results The average value of width in 3-D mode was 19.5 mm. No significant difference was found, compared with actual width （20 mm）. There was no significant difference between computer measurement and manual measurement of the plaster head model （ P 〉 0. 05 ）. Conclusions DSC-2 three-dimensional facial imaging system was accurate and reliable to obtain 3-D facial images.