模拟口腔取模环境下TRIOS数字印模的精密度  

Precision of digital impressions with TRIOS under simulated intraoral impression taking conditions

作　　者：杨鑫[1] 孙一飞 田雷 司文捷[3] 冯海兰[1] 刘亦洪[4,5] 

机构地区：[1]北京大学口腔医学院.口腔医院修复科,北京100081 [2]深圳爱尔创科技股份有限公司,广东深圳518000 [3]清华大学材料科学与工程系,北京100083 [4]北京大学口腔医学院.口腔医院综合科,北京100081 [5]口腔数字化医疗技术和材料国家工程实验室,北京100081

出　　处：《北京大学学报（医学版）》2015年第1期85-89,共5页Journal of Peking University:Health Sciences

摘　　要：目的：研究模拟口腔取模环境下TRIOS数字印模的精密度,并与口外模型扫描的精密度比较。方法：制作6个#14~#17树脂牙列,其中#16为离体牙的全瓷冠预备体。对树脂牙列分别进行：（1）硅橡胶取印模,灌注石膏模型,3Shape D700模型扫描仪重复扫描10次;（2）固定于仿头模内,3Shape TRIOS口内扫描仪重复扫描10次。Geomagic Qualify12.0对重复扫描数据两两进行最佳拟合对齐和3D比较,分别输出配准数据间的平均偏差（averaged errors,AE）和差异分布彩图。秩和检验定量分析数字印模组与模型组AE的差异,根据差异分布彩图定性描述偏差分布特征。结果：数字印模组AE均数为7.058 281μm,高于模型组4.092 363μm,差异具有统计学意义（P〈0.05）,但是数字印模组AE的均数和中位数均小于10μm,表明扫描数据间一致性良好。模型组偏差分布均匀,数字印模组偏差较大区域主要分布于肩台及邻面区域。结论：TRIOS数字印模精密度良好,可达到临床应用要求,预备体肩台及邻面区域为扫描的难点。Objective： To evaluate the precision of digital impressions taken under simulated clinical impression taking conditions with TRIOS and to compare with the precision of extraoral digitalizations.Methods： Six #14- #17 epoxy resin dentitions with extracted #16 tooth preparations embedded were made. For each artificial dentition,（ 1） a silicone rubber impression was taken with individual tray,poured with type IV plaster,and digitalized with 3Shape D700 model scanner for 10 times;（ 2） fastened to a dental simulator,10 digital impressions for each were taken with 3Shape TRIOS intraoral scanner. To assess the precision,best-fit algorithm and 3D comparison were conducted between repeated scan models pairwise by Geomagic Qualify 12. 0,exported as averaged errors（ AE） and color-coded diagrams. Nonparametric analysis was performed to compare the precisions of digital impressions and model images. The color-coded diagrams were used to show the deviations distributions. Results： The mean of AE for digital impressions was 7. 058 281 μm,which was greater than that of 4. 092 363 μm for the model images（ P〈 0. 05）. However,the means and medians of AE for digital impressions were no more than 10 μm,which meant that the consistency between the digital impressions was good. The deviations distribution was uniform in the model images,while nonuniform in the digital impressions with greater deviations lay mainly around the shoulders and interproximal surfaces. Conclusion： Digital impressions with TRIOS are of good precision and up to the clinical standard. Shoulders and interproximal surfaces scanning are more difficult.

关 键 词：牙科印模技术 成像 三维 牙修复体设计 

分 类 号：R783.3[医药卫生—口腔医学]