CAJ | 학술논문

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（ aver-aged 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7．058281μm，高于模型组4．092363μm，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。
목적：연구모의구강취모배경하TRIOS수자인모적정밀도，병여구외모형소묘적정밀도비교。방법：제작6개＃14～＃17수지아렬，기중＃16위리체아적전자관예비체。대수지아렬분별진행：（1）규상효취인모，관주석고모형，3Shape D700모형소묘의중복소묘10차；（2）고정우방두모내，3Shape TRIOS구내소묘의중복소묘10차。Geomagic Qualify12．0대중복소묘수거량량진행최가의합대제화3D비교，분별수출배준수거간적평균편차（ aver-aged errors ，AE）화차이분포채도。질화검험정량분석수자인모조여모형조AE적차이，근거차이분포채도정성묘술편차분포특정。결과：수자인모조AE균수위7．058281μm，고우모형조4．092363μm，차이구유통계학의의（P＜0．05），단시수자인모조AE적균수화중위수균소우10μm，표명소묘수거간일치성량호。모형조편차분포균균，수자인모조편차교대구역주요분포우견태급린면구역。결론：TRIOS수자인모정밀도량호，가체도림상응용요구，예비체견태급린면구역위소묘적난점。
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 3 D comparison were conducted between repeated scan models pairwise by Geomagic Qualify 12.0, exported as averaged errors (AE) and color-coded diagrams.Non-parametric 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.