模拟口腔取模环境下TRIOS数字印模的精密度

发布时间：2018-06-06 05:16

本文选题：牙科印模技术 + 成像　；参考：《北京大学学报(医学版)》2015年01期

【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(P0.05),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。
[Abstract]:Aim: to study the precision of TRIOS digital impression in simulated oral cavity and compare it with that of external model. Methods: six #14 #17 resin dentitions were made, of which #16 was the all-ceramic crown preparation for isolated teeth. The resin dentition was made with 1% of the silicone rubber and the impression was obtained by using silicone rubber. The 3Shape D700 model scanner was fixed to the 3Shape TRIOS mouth scanner for 10 times. Geomagic Qualify12.0 performed the best fitting alignment and 3D comparison of the repeated scanning data. The average deviation between the registration data and the difference distribution color map are outputted respectively. The difference of AE between digital printing module and model group was quantitatively analyzed by rank sum test, and the deviation distribution characteristics were described qualitatively according to the difference distribution color map. Results: the average AE of digital printing module group was 7.058 281 渭 m, which was higher than that of model group 4.092 363 渭 m, the difference was statistically significant (P 0.05), but the mean number and median of AE in digital printing module group were less than 10 渭 m, which indicated that the scanning data were consistent. The deviation distribution of the model group is uniform, and the large deviation area of the digital printing module is mainly distributed in the shoulder platform and adjacent area. Conclusion the precision of the digital impression is good and it can meet the requirement of clinical application. The shoulder plate and adjacent area of the prepared body are the difficult points in scanning.
【作者单位】：北京大学口腔医学院·口腔医院修复科;深圳爱尔创科技股份有限公司;清华大学材料科学与工程系;北京大学口腔医学院·口腔医院综合科;口腔数字化医疗技术和材料国家工程实验室;
【分类号】：TP391.7;R783.3

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