摘要
目的：用表面分析方法对三维激光扫描仪分别扫描石膏模型和印模获得的数字模型的准确性和一致性进行比较。方法 ：对20个病例分别采用两种方法采集上颌和下颌数字模型。将同一病例的两种数字模型输入Rapid Form软件以最佳配对算法进行叠加,并采用表面分析方法对叠加结果加以分析。测量两模型上各点的线性距离,在容差设定为0.05、0.10、0.25、0.50、0.75、1.00 mm的情况下,确定相关模型之间的重叠百分率。此外,对6个预定的线性测量指标也进行测量和分析。结果 ：平均上颌模型的线性距离是0.097~0.191 mm,而下颌模型的平均线性距离是0.092~0.257 mm。在0.50 mm容差值水平,可以得到超过94%的表面相关性。组内相关系数（intraclass correlation coefficients,ICCs）统计表明两种方法获得的数字模型间有很好的一致性（0.972≤ICCs≤0.998）。结论 ：两种方法生成的数字模型在软件中有很好的重叠,经表面分析方法分析统计两者一致性较好,表明直接从印模获取数字模型是可行的。
Objective：We sought to determine the accuracy of digital models generated from impressions and casts respectively by an ortho insight 3D laser scanner（Motion View Software,Chattanooga,Tenn）and compare them with surface area analysis method.Methods：Two sets of maxillary and mandibular digital models of 20 subjects were obtained. The models were made from impressions and casts were scanned by ortho insight 3D digital scanner,respectively. Each patient＇s matched pairs of maxillary and mandibular models were superimposed by using a software program and a best-fitalgorithm; surface-to-surface analysis was then performed. The average linear differences between the 2 files at all points on the surfaces were measured,and tolerance levels of 0.05,0.1,0.25,0.5,0.75,and 1.0 mm were set to determine the surface correlation amounts between the 2 files. Additionally,6 linear measurements from predetermined landmarks were also measured and analyzed. Results：The average maxillary model linear difference was 0.097 to0.191 mm,whereas the average mandibular model linear difference ranged between 0.092 and 0.257 mm. Greater than a 94% surface correlation was obtained on average at 0.5 mm tolerance level. The mean differences obtained from the linear measurements indicated strong agreement（0.972≤single measure ICCs≤0.998） between the maxillary and mandibular pairs. Conclusion：Surface-to-surface analysis of digital models generated from impressions and casts by ortho insight 3D digital scanner pointed to a fair overlap between the protocols. Therefore,the digital model generated directly from impressions is an alternative for that from casts.
出处
《南京医科大学学报（自然科学版）》
CAS
CSCD
北大核心
2016年第9期1132-1135,共4页
Journal of Nanjing Medical University(Natural Sciences)
基金
江苏省高校优秀中青年教师境外研修计划资助
关键词
表面分析
数字模型
石膏模型
surface analysis
digital models
plaster models
