全冠预备体终止线局部扫描正确度对整体的影响  

Influence of trueness for local finish lines of a full crown preparation on that of complete finish line

作　　者：姜楠 包旭东[1] 岳林[1] JIANG Nan;BAO Xu-dong;YUE Lin(Department of Cariology and Endodontology, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China)

机构地区：[1]北京大学口腔医学院·口腔医院,牙体牙髓科国家口腔疾病临床医学研究中心,口腔数字化医疗技术和材料国家工程实验室,口腔数字医学北京市重点实验室,北京100081

出　　处：《北京大学学报（医学版）》2021年第1期102-108,共7页Journal of Peking University:Health Sciences

摘　　要：目的:探讨影响数字化印模中全冠预备体终止线扫描正确度的因素。方法:在树脂牙列模型上制备右上第一磨牙标准全冠预备体,分别进行牙列内全冠预备体和孤立全冠预备体终止线的扫描正确度检测。牙列内全冠预备体终止线的扫描正确度检测:(1)应用Imetric扫描仪扫描全冠预备体,获得STL格式数据作为参考真值;(2)应用CEREC Omnicam口内扫描仪和3Shape TRIOS口内扫描仪扫描全冠预备体,同一操作者重复6次,获得STL格式数据,将Imetric扫描仪、CEREC Omnicam口内扫描仪和3Shape TRIOS口内扫描仪的扫描数据导入Geomagic Studio 2013软件中,提取全冠预备体整体终止线和局部终止线(近、远中和颊、舌侧)图像及数据,与Imetric扫描仪参考真值进行3D偏差分析,输出配准数据间的均方根误差(root mean square,RMS)值作为扫描正确度评价指标,RMS值越大,正确度越低。应用SPSS软件进行独立样本t检验,对CEREC Omnicam口内扫描仪和3Shape TRIOS扫描仪的全冠预备体终止线RMS值进行比较,并分析各部位终止线RMS值与整体终止线的关系。孤立全冠预备体终止线的扫描正确度检测:(1)去除预备体前后邻牙,建立孤立全冠预备体模型;(2)应用CEREC Omnicam口内扫描仪和3Shape TRIOS口内扫描仪扫描全冠预备体,同一操作者重复6次,数据采集和分析同牙列内全冠预备体终止线的扫描正确度检测。结果:在完整牙列内,(1)CEREC Omnicam口内扫描仪扫描全冠预备体整体终止线的RMS值[(44±7)μm]大于3Shape TRIOS口内扫描仪[(35±6)μm](P<0.05);(2)CEREC Omnicam口内扫描仪扫描全冠预备体远中终止线的RMS值[(63±7)μm]最大(P<0.05),近中RMS值[(45±9)μm]大于颊侧[(38±3)μm]和舌侧[(40±3)μm],但差异无统计学意义(P>0.05)。3Shape TRIOS口内扫描仪扫描近、远中终止线的RMS值分别为[(45±8)μm]和[(50±10)μm],均显著高于颊侧[(33±8)μm]、舌侧[(33±6)μm](P<0.05)。CEREC Omnicam口内扫�Objective:To investigate the factors affecting the trueness of finish lines of full crown preparations in digital impressions.Methods:A full crown preparation of the right maxillary molar was prepared on the standard resin dentition model,the trueness of the finish lines,the full crown preparation in the whole dentition and the isolated full crown preparation were measured respectively.Detection of scanning trueness of the finish lines of the full crown preparation in the whole dentition:(1)Using Imetric scanner to scan the full crown preparation,obtaining STL(Stereo lithographic)format data as the reference true value;(2)Using CEREC Omnicam oral scanner and 3Shape TRIOS oral scanner to scan the full crown preparation,obtaining all the STL format data,import Geomagic Studio 2013 software,extraction of images and data of the complete finish lines or local finish lines(mesial,distal,buccal,lingual)of the full crown preparation,then using the data to 3D Compare Analysis with the reference true value,outputting RMS(root mean square)values which could evaluate the scanning trueness,the lower RMS value was,the lower the trueness was.The detection of scanning trueness of the finish lines of the isolated full crown preparation:(1)the anterior and posterior adjacent teeth of the preparation were removed to establish the model of the isolated full crown preparation;(2)CEREC Omnicam oral scanner and 3Shape TRIOS oral scanner were used to scan the isolated preparations,and each group was repeated 6 times.Data collection and analysis were the same as the first part,that is,detection of scanning trueness of finish lines of the full crown preparation in the whole dentition.Results:In the whole dentition,(1)the RMS value[(44±7)μm]of CEREC Omnicam oral scanner scanning complete finish lines was greater than that of 3Shape TRIOS oral scanner[(35±6)μm](P<0.05).(2)the RMS values of the mesial[(45±9)μm],buccal[(38±3)μm]and lingual[(40±3)μm]finish lines in CEREC Omnicam oral scanner scanning were all lower than that in dista

关 键 词：口内扫描仪 正确度 预备体 终止线 

分 类 号：R782.1[医药卫生—口腔医学]