Chen H, Zhao T, Wang Y, Sun Y C
Center for Digital Dentistry, Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Research Center of Engineering and Technology for Digital Dentistry of Ministry of Health & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China.
Beijing Da Xue Xue Bao Yi Xue Ban. 2016 Oct 18;48(5):900-904.
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.
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 13.0 system 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 Imageware 13.0.
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, (0.08±0.06) mm in the buffer area; the space between the tissue faces of the plaster model and the scanned tissue surface of custom tray was (1.98±0.40) mm, with (1.85±0.24) mm in the primary stress-bearing area, (1.86±0.26) mm in the secondary stress-bearing area, (1.77±0.36) mm in the border seal area, (2.90±0.26) mm in the buffer area.
With 3D scanning, computer aided design and FDM technology, an efficient means of custom tray production was established.
基于无牙颌初印模的三维（3D）扫描，利用熔融沉积建模（FDM）建立一种制作无牙颌定制托盘的数字化方法，并对其准确性进行定量评估。
采用红色模型材料对标准上颌无牙颌石膏模型制取初印模。使用3D扫描仪获取石膏模型数据和初印模组织面数据。在Gemomagic 2012软件中，利用交互式绘制曲线、局部填充孔、局部偏移、整体偏移、整体外壳等命令，模拟绘制托盘边界、填补倒凹、缓冲以及生成托盘主体等临床操作。设计一个标准形状的托盘手柄并连接到托盘主体，将数据保存为立体光刻（STL）格式。将数据导入连接到3D FDM打印设备的计算机系统，使用聚乳酸（PLA）丝材以0.2mm/层的厚度逐层打印无牙颌模型的定制托盘，然后用3D扫描仪扫描托盘的组织面。利用Geomagic 2012的配准功能对三维表面数据进行配准，使用Imageware 13.0系统的点云偏差分析功能分析误差。将定制托盘的CAD数据与扫描数据进行配准，分析两者之间的误差。将扫描的石膏模型表面与扫描的印模表面配准，将扫描的托盘数据与CAD数据配准，然后在Imageware 13.0中测量石膏模型表面与定制托盘扫描组织面之间的距离。
定制托盘的计算机辅助设计数据与扫描数据之间的偏差为（0.17±0.20）mm，主承托区为（0.19±0.18）mm，副承托区为（0.17±0.22）mm，边缘封闭区为（0.30±0.29）mm，缓冲区为（0.08±0.06）mm；石膏模型组织面与定制托盘扫描组织面之间的间隙为（1.98±0.40）mm，主承托区为（1.85±0.24）mm，副承托区为（1.86±0.26）mm，边缘封闭区为（1.
