Photoshop进行模型测量的可靠性探讨

目的 探讨用Photoshop进行模型测量的可靠性.方法 牙列拥挤正畸病例上颌记存模10个,用数码相机分别拍摄其上下颌模型面的照片,用Photoshop法在数码相片上测量其前牙的可用间隙和必须间隙,用传统方法在石膏模型上测量其前牙的可用间隙和必须间隙,由5个测量者用同样的方法测量.比较不同测量者测量同一项目的 测量结果,以及同一测量者用两种测量方法的测量结果.结果 传统方法测量可用间隙时,5名测量者（M1～M5）的测量结果可重复性不高,M1的测量结果（44.87±2.55）mm分别与M3（42.15±2.20）mm和M5（41.86±3.12）mm的测量结果差异有统计学意义（P＜0.05）;Photoshop法测量可用间隙时,可重复性较传统方法高,M5的测量结果（41.10±2.96）mm和其余4人的测量结果差异皆有统计学意义（P＜0.05）;Photoshop法和传统方法测量必须间隙时,其可重复性皆比测量可用间隙时高,各组的测量结果差异无统计学意义（P＞0.05）.结论 测量必须间隙时,Photoshop法和传统方法差别不大,而测量可用间隙时,Photoshop法比传统方法有明显的优势.

The reliability of cast measurements by using Photoshop

Objective To investigate the reliability of cast measurements by comparing Photoshop and conventional hand-held method. Methods Maxillary standard plaster models from 10 orthodontic cases with crowding were enrolled in this study. The space available and the space required of anterior region were measured by using Photoshop in the digital pictures or conventional method used by 5 observers respectively.The measurement results of the same sample among every observer were analyzed with ANOVA, and the difference between the 2 methods was calculated and paired t test was used to analyze the data. Results The repeatability of measurement results was not good when the space available was measured with conven-tional method by different observer( M1 ～ M5 ), and the measurement results of M1 were significantly different from that of M3 and M5 respectively( P ＜ 0.05 ). The repeatability of measurement results was relatively good when the space available was measured by using Photoshop, and the measurement results of M5 were significantly different from other observers ( P ＜ 0.05 ). The measurement results of space required measured by different observer were very close, and the reproducibility was excellent when they were measured by means of Photoshop or conventional methods. Conclusion There were no much difference between Photoshop and conventional method to measure the required space. Photoshop had significant advantage over conventional method when available sRace was measured.