椅旁数字化模型上测量牙尖斜面夹角的可靠性研究
Reliability study in the measurement of the cusp inclination angle of a chairside digital model
作者：刘星纲, 陈小贤
Author：Xinggang Liu, Xiaoxian Chen
收稿日期： 年卷（期）页码：2018,36(1):56-56-59
期刊名称：华西口腔医学杂志
Journal Name：West China Journal of Stomatology
关键字：椅旁数字化印模,计算机辅助设计与辅助制造,牙尖斜面夹角,可靠性,组内相关系数,
Key words：chairside digital impression,computer-aided design and computer-aided manufacturing,cusp inclination angle,reliability,intraclass correlation coefficient,
基金项目：[基金项目] 北京口腔医院学科建设基金面上项目（13-9-20）;2017年度北京市属医院科研培育计划（PX2017031）
中文摘要
目的 评价使用第三方软件测量椅旁数字化模型的牙尖斜面夹角的可靠性。方法 21副石膏模型修整出二维截面后作为实验对象,使用椅旁数字化印模技术获取三维模型,第三方软件测量数字模型上牙尖斜面夹角,重复3次;手工测量实验模型牙尖斜面夹角作为金标准。统计组内相关系数（ICC）和t值,评价测量的一致性。结果 2种测量方法行配对t检验分析,结果差异无统计学意义（P=0.91）;两种测量方法的ICC均大于0.9;每种测量方法3次重复的ICC也大于0.9;数字化模型具有更小的变异系数（9.9%）。结论 第三方软件测量数字化模型的牙尖角度具有良好的可靠性。
英文摘要
ObjectiveThis study aims to evaluate the reliability of the software Picpick in the measurement of the cusp inclination angle of a digital model.MethodsTwenty-one trimmed models were used as experimental objects. The chair-side digital impression was then used for the acquisition of 3D digital models, and the software Picpick was employed for the measurement of the cusp inclination of these models. The measurements were repeated three times, and the results were compared with a gold standard, which was a manually measured experimental model cusp angle. The intraclass correlation coefficient (ICC) was calculated.ResultsThe pairedttest value of the two measurement methods was 0.91. The ICCs be-tween the two measurement methods and three repeated measurements were greater than 0.9. The digital model achieved a smaller coefficient of variation (9.9%).ConclusionThe software Picpick is reliable in measuring the cusp inclination of a digital model.
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