数字化正畸模型测量的可靠性研究

Reliability Evaluation of Digital Orthodontic Model Measurement

目的评价数字化模型测量的可靠性。方法在正畸门诊随机选取13例就诊患者的石膏记存模型,使用3Shape扫描仪扫描石膏模型转化为数字化模型并应用扫描仪辅助制作软件(Magics 20.03)进行测量,手工测量石膏模型作为金标椎,每种方法都重复测量3次。测量参数包括牙冠宽度、牙弓现有长度、牙弓宽度、牙弓长度、腭穹高度。使用组内相关系数(ICC)和配对t检验评价测量的一致性。结果石膏模型手工测量和数字化模型测量每个模型重复3次所得ICC值均>0.8,两种测量方法的相关性值也>0.8;配对t检验分析发现对两种测量方法的24、26、35、36、37、46牙冠宽度、下牙弓中段长度和腭穹高度差异有统计学意义(P<0.05),其余的测量数值,包括牙齿拥挤度等差异无统计学意义。结论尽管个别测量参数会有差异,但数字化模型测量与石膏模型测量一致性较高,尤其是牙齿拥挤度与石膏模型的差异较小,不影响临床正畸方案的制定。

Objective To evaluate the reliability of digital orthodontic model measurement.Methods The plaster models of 13 orthodontic patients were randomly selected in clinic.The plaster models were scanned by 3shape scanner and transformed into digital images,and measured by the scanner aided software(magics 20.03).The plaster models were measured manually as the gold standard.Each method was repeated for three times.The measurement parameters include:crown width,existing arch length,arch width,arch length and palatal height.Statistical intra-group correlation coefficient(ICC)were used to evaluate the consistency of measurement,and paired t-test was used to analyze the data of the two measurement methods.Results The ICC values obtained by manual and digital plaster modelsand the correlation values of the two methods were both greater than 0.8.Paired t-test analysis showed that there were statistically significant differences in crown width(24,26,35,36,37 and 46),middle length of lower arch,and palatal height(P<0.05)between two groups,while there were no statistically significant differences in other measurement values,including tooth crowding.Conclusion Although some individual measurement parameters may be different,the consistency between the digital model measurement and plaster model measurement is high,especially the difference of dental crowding degree,which does not affect the orthodontic diagnosis and decisionin clinic.