基于初印模三维扫描的无牙颌上颌个性化托盘计算机辅助设计及三维打印  

Computer aided design and 3-dimensional printing for the production of custom trays of maxillary edentulous jaws based on 3-dimensional scan of primary impression

作　　者：陈虎[1] 赵甜[1] 王勇[1] 孙玉春[1] 

机构地区：[1]北京大学口腔医学院·口腔医院,口腔医学数字化研究中心,口腔修复教研室,口腔数字化医疗技术和材料国家工程实验室,卫生部口腔医学计算机应用工程技术研究中心,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）》2016年第5期900-904,共5页Journal of Peking University:Health Sciences

基　　金：国家自然科学基金(81271181);首都卫生发展科研专项重点攻关项目(首发2016-1-4101)资助~~

摘　　要：目的:基于红色打样膏初印模三维扫描,建立一种无牙颌个性化托盘的计算机辅助设计(computer aided design,CAD)和工艺熔融沉积制造(fused deposition modeling,FDM)制作方法,定量评价加工精度。方法:在标准上颌无牙颌石膏模型上制取红色打样膏初印模,用牙颌模型三维扫描仪扫描红色打样膏初印模,得到扫描数据,在Gemomagic 2012软件中用交互绘制曲线、局部填补空洞、局部增厚、整体偏移、整体抽壳等命令,完成提取托盘边界、填倒凹、缓冲、预留终印模三维空间和生成托盘厚度的操作,设计标准形状手柄,得到个性化托盘三维设计数据。将托盘设计数据导入与FDM三维打印设备连接的电脑系统,打印聚乳酸(polylactic acid,PLA)材质的无牙颌个性化印模托盘,用牙颌模型三维扫描仪扫描托盘整体。在Gemomagic 2012软件中,以托盘组织面为共同区域,将个性化托盘CAD数据和个性化托盘三维扫描数据进行配准,利用Imageware 13.0的点云偏差分析功能测量三维设计数据和三维扫描数据之间的偏差。扫描石膏模型得到其表面三维数据,将石膏模型数据对齐于印模数据,同时个性化托盘扫描数据对齐于个性化托盘三维设计数据,利用Imageware 13.0的点云偏差分析功能测量三维扫描数据和石膏模型数据表面的距离。结果:与CAD数据对比,加工完成的上颌个性化托盘内表面整体平均偏差为(0.17±0.20)mm,主承托区平均偏差为(0.19±0.18)mm,副承托区平均偏差为(0.17±0.22)mm,边缘封闭区平均偏差为(0.30±0.29)mm,缓冲区平均偏差为(0.08±0.06)mm;托盘内表面与石膏模型表面平均间隙大小为(1.98±0.40)mm,主承托区平均间隙量为(1.85±0.24)mm,副承托区平均间隙量为(1.86±0.26)mm,边缘封闭区平均间隙量为(1.77±0.36)mm,缓冲区平均间隙量为(2.90±0.26)mm。结论:结合红色打样膏初印模三维扫描、CAD和FDM技术,可成功实现上颌无牙颌个性化�Objective： To establish a digital method for production of custom trays for edentulous jaws using fused deposition modeling（ FDM） based on three-dimensional（ 3D） scans of primary jaw impressions,and to quantitatively evaluate the accuracy. Methods： A red modeling compound was used to make a primary impression of a standard maxillary edentulous plaster model. The plaster model data and the primary impression tissue surface data were obtained using a 3D scanner. In the Gemomagic 2012 software,several commands were used,such as interactive drawing curves,partial filling holes,local offset,bodily offset,bodily shell,to imitate clinical procedures of drawing tray boundary,filling undercut,buffer,and generating the tray body. A standard shape of tray handle was designed and attached to the tray body and the data saved as stereolithography（ STL） format. The data were imported into a computer system connected to a 3D FDM printing device,and the custom tray for the edentulous jaw model was printed layer upon layer at 0. 2 mm / layer,using polylactic acid（ PLA） filament,the tissue surface of the tray was then scanned with a 3D scanner. The registration functions of Geomagic 2012 was used to register the 3-dimentional surface data,and the point-cloud deviation analysis function of the Imageware 13. 0system was used to analyze the error. The CAD data of the custom tray was registered to the scan data,and the error between them was analyzed. The scanned plaster model surface was registered to the scanned impression surface and the scanned tray data to the CAD data,then the distance between the surface of plaster model and the scanned tissue surface of the custom tray was measured in Imageware13. 0. Results： The deviation between the computer aided design data and the scanned data of the custom tray was（ 0. 17 ± 0. 20） mm,with（ 0. 19 ± 0. 18） mm in the primary stress-bearing area,（ 0. 17 ±0. 22） mm in the secondary stress-bearing area,（ 0. 30 ± 0. 29） mm in the border seal area,（ 0.

关 键 词：义齿 全口 计算机辅助设计 工艺熔融沉积制造 个性化托盘 

分 类 号：R783.1[医药卫生—口腔医学]