Song Yang, Zhao Yi-jiao, Sun Yu-chun, Lü Pei-jun, Wang Yong
Center of Digital Dentistry, 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, Ministry of Health, Beijing 100081, China.
Zhonghua Kou Qiang Yi Xue Za Zhi. 2013 Sep;48(9):550-3.
To evaluate the design and manufacture accuracy of a domestic computer aided design (CAD) and computer aided manufacture (CAM) system, and to compare it with similar foreign products.
Thirty models of posterior-teeth-single-crown preparations were collected, and STL data of these preparations was collected by Denmark 3Shape scanner. Three copings were made for each preparation, the one designed and manufactured using commercial CAD/CAM system (3Shape CAD software and Wieland T1 CAM equipment) was assigned into control group T0, the one designed and manufactured using domestic CAD software (developed by Peking University School and Hospital of Stomatology and Nanjing University of Aeronautics and Astronautics) and Wieland T1 CAM equipment was assigned into experimental group TCAD for design accuracy evaluation, and the one designed and manufactured using 3Shape CAD software and domestic CAM equipment (developed by Peking University School and Hospital of Stomatology, Tsinghua University and ShanDong XinHua Incorporated Company of medical apparatus and instruments) was assigned into experimental group TCAM for manufacture accuracy evaluation. Finally, the marginal fitness were compared and evaluated by using 3D & Profile measurement microscope laser.
The marginal fitness of TCAD was 27.98 (19.10, 46.57) µm in buccal, 32.67 (20.65, 50.82) µm in lingual, 27.38 (22.53, 52.61) µm in mesial, 29.50 (22.68, 53.65) µm in distal; of TCAM was 21.69 (15.87, 30.21) µm in buccal, 18.51 (13.50, 22.51) µm in lingual, 19.15 (15.42, 26.89) µm in mesial, 22.77 (18.58, 32.15) µm in distal; and there were no statistical differences compared with T0 [20.16 (17.16, 48.00) µm in buccal, 21.51 (17.05, 28.31) µm in lingual, 23.54 (17.89, 30.04) µm in mesial and 23.94 (17.93, 28.19) µm in distal] except lingual data of TCAD.
The design and machining precision of this domestic CAD/CAM system is at the same level of those comparable foreign products.
评价一款国产计算机辅助设计（CAD）与计算机辅助制造（CAM）系统的设计与制造精度，并与国外同类产品进行比较。
收集30个后牙单冠预备体模型，采用丹麦3Shape扫描仪采集这些预备体的STL数据。为每个预备体制备3个全冠，其中一个使用商用CAD/CAM系统（3Shape CAD软件和Wieland T1 CAM设备）设计和制造，归入对照组T0；一个使用国产CAD软件（由北京大学口腔医学院和南京航空航天大学开发）和Wieland T1 CAM设备设计和制造，归入实验组TCAD以评估设计精度；一个使用3Shape CAD软件和国产CAM设备（由北京大学口腔医学院、清华大学和山东新华医疗器械股份有限公司开发）设计和制造，归入实验组TCAM以评估制造精度。最后，使用三维轮廓测量显微镜激光对边缘适合性进行比较和评估。
TCAD的边缘适合性在颊侧为27.98（19.10，46.57）µm，舌侧为32.67（20.65，50.82）µm，近中为27.38（22.53，52.61）µm，远中为29.50（22.68，53.65）µm；TCAM的边缘适合性在颊侧为21.69（15.87，30.21）µm，舌侧为18.51（13.50，22.51）µm，近中为19.15（15.
