title: [Initial evolution research for design and process accuracy of one type of domestic computer aided design soft and computer aided manufacture].
abstract: OBJECTIVE
  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.
  
  
  METHODS
  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.
  
  
  RESULTS
  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.
  
  
  CONCLUSIONS
  The design and machining precision of this domestic CAD/CAM system is at the same level of those comparable foreign products.
authors: 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.
authors: Yang
authors: Y
authors: Song
authors: Yi-jiao
authors: YJ
authors: Zhao
authors: Yu-chun
authors: YC
authors: Sun
authors: Pei-jun
authors: PJ
authors: Lü
authors: Yong
authors: Y
authors: Wang
mesh_terms: D002681:China; D017076:Computer-Aided Design; D003442:Crowns / Q000592:standards; D018772:Dental Marginal Adaptation; D006801:Humans; D012984:Software