title: [Study on the occlusal surface design methods of CAD/CAM all-ceramic coping crown].
abstract: OBJECTIVE
  To evaluate the accuracy of occlusal surface design methods for Cerec2 CAD/CAM all-ceramic coping crown.
  
  
  METHODS
  Ten first molar all-ceramic crown preparations were made. Five were normal occlusion, and five were abnormal. The crown was designed by Cerec 2 CAD/CAM using three methods, namely Extrapolation, Correlation and Function, for every preparation. The Z values of mesiobuccal, mesiolingual, distobuccal, distolingual angle in marginal ridge were recorded.
  
  
  RESULTS
  In the normal occlusion group, there was no statistical difference among the three occlusal surface design methods (P > 0.05). In the abnormal occlusion group, there were statistical differences between the occlusal surface design methods (P < 0.05); the function method was noted to be more accurate than the others.
  
  
  CONCLUSIONS
  The results indicate that the extrapolation method can be applied to patients with normal occlusion and the function method can be applied to patients with abnormal occlusion.
authors.affiliation: Department of Prosthodontics, West China School of Stomatology, Sichuan University, Chengdu 610041, China.
authors.forename: Hua-rong
authors.initials: HR
authors.lastname: Wang
authors.forename: Yun-feng
authors.initials: YF
authors.lastname: Zhao
authors.forename: Fei-min
authors.initials: FM
authors.lastname: Zhang
mesh_terms: D002516:Ceramics; D017076:Computer-Aided Design; D003442:Crowns; D003725:Dental Articulators; D003766:Dental Occlusion; D003769:Dental Occlusion, Traumatic / Q000517:prevention & control; D017267:Dental Prosthesis Design; D006801:Humans; D007574:Jaw Relation Record / Q000379:methods; D008334:Mandible; D003765:Models, Dental