用于简单病例无托槽隐形矫治器制作的3D打印模型精度研究  

Accuracy evaluation of 3D-printed dental models used for the fabrication of clear aligners in mild malocclusions

作　　者：李晶[1] 韩高峰 王硕[1] 周彦恒[1] Li Jing;Han Gaofeng;Wang Shuo;Zhou Yanheng(Department of Orthodontics,Peking University School 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;Department of Orthodontics,School of Stomatology,Tongji University,Shanghai Engineering Research Center of Tooth Restoration and Regenration,Shanghai 200072,China)

机构地区：[1]北京大学口腔医学院·口腔医院正畸科,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,100081 [2]同济大学附属口腔医院正畸科,上海牙组织修复与再生工程技术研究中心,200072

出　　处：《中华口腔正畸学杂志》2021年第4期184-187,共4页Chinese Journal of Orthodontics

摘　　要：目的应用数字化的诊疗设计和3D打印制作无托槽隐形矫治器从而解决简单牙列不齐等问题。评价基于数字光处理技术3D打印牙列模型的精确性,论证该数字化正畸流程可行性。方法通过选取轻度间隙不调、扭转等不同类型的简单不齐病例20例,3shape Trios全称“口内扫描”获得牙列信息后应用3shape Ortho Analyzer软件进行排牙设计并导出各阶段步骤模型数据用于3D打印和压制无托槽矫治器;在85个上下领牙列数字化设计模型和对应3D打印模型上选取对应左右中切牙、尖牙和磨牙的牙冠高度、牙冠宽度尖牙和磨牙间牙弓宽度、牙弓长度分别进行软件及手工测量。采用组内相关系数(ICC)对重复测量信度进行评估;采用配对t检验分析两种模型在各测量指标上有无差异以检验模型精确性。结果软件测量数字化设计模型和手工测量3D打印实体模型结果的ICC均>0.95,测量者应用软件及手工测量的可重复性均较高。两种模型在除外牙冠高度的其他各测量指标上的一致性高,配对t检验结果P>0.05,整体偏差范围在(-0.01±0.12)mm至(0.11±0.31)mm之间。结论基于数字光处理技术以10μm层厚精度3D打印的牙列模型精确性较高,可用于临床简单病例隐形矫治器制作。Objective The objective of this study was to assess the accuracy and feasibility of three dimensional(3D)printing dental models based on Digital Light Processing(DLP)used for the fabrication of clear aligners in mild malocclusions.Methods T wenty patients with different types of simple irregularities were selected and intra-oral scanned for the digital dental models with 3shape Trios.The 3shape Ortho Analyzer software was used to setup the digital models and the tooth movement staging.The step model data were derived for 3D printing and aligner fabrication.Eighty-five upper and lower jaw dentition digital models and 3D-printed models were compared digitally or manually with the selected corresponding crown height,crown width,arch width and length measurements to test the consistency and acuracy of the 3D-printed model.The intraclass correlation coefficients(ICC)was used to evaluate the reliability of the two measurement methods.Paired t tests were used to detect significant differences in the measurements between the 3D printed models and the original digital models.Results The intraclass correlation coefficients for all the comparisons made between the 3D replicas and the original digital models were greater than 0.95.This indicated an excellent agreement.No statistically significant differences could be detected between the 3D-printed models and their corresponding digital models except for crown height measurements.The overall difference was ranging from(-0.01±0.12)mm to(0.11±0.31)mm.Conclusions The accuracy of the 3D models produced by the DLP techniques at 10μm layer heights for the fabrication of clear aligners in mild malocclusions was clinically acceptable.

关 键 词：3D打印 牙列模型 数字化模型 隐形矫治器 

分 类 号：R783.5[医药卫生—口腔医学]