title: [Effect of camera control devices of Cerec 2 on the fit of CAD/CAM all-ceramic copyings of posterior tooth].
abstract: OBJECTIVE
  To investigate the effect of camera control devices of Cerec 2 on the fit of CAD/CAM all-ceramic copyings of posterior tooth.
  
  
  METHODS
  24 all-ceramic copyings were made by Cerec 2 with camera control devices and that without camera control devices. Copyings were embed and sectioned, then SEM and image analyzer was used to measure the space between the copyings and dies at the marginal opening, the axial wall, and the occlusal adaptation at the measurement locations.
  
  
  RESULTS
  The marginal fit at buccal space of copyings with camera control devices group was smaller than that without camera control devices group (P < 0.05). The internal fit of of copyings had statistically significant difference at mesio-axial, disto-axial, bucco-axial, bucco-occlusal, linguo-occlusal and disto-occlusal space between camera control device group and without camera control devices group (P < 0.05). There was no statistical difference on the marginal fit and internal fit of copyings between Vita MK II and porous alumina oxide (P < 0.05).
  
  
  CONCLUSIONS
  The Cerec 2 with camera control devices reduced effectively the inaccuracy of inner space of copyings which contributed from the technical errors of the operator, and provided well-proportioned space for adhesive. Both the fit of copyings made of Vita MK II and porous alumina oxide satisfied the clinical demand.
authors.affiliation: Key Laboratory of Oral Biomedical Engineering Ministry of Education, Sichuan University, Chengdu 610041, China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Chen
authors.forename: Hong
authors.initials: H
authors.lastname: Li
authors.forename: Yun-Feng
authors.initials: YF
authors.lastname: Zhao
authors.forename: Xing
authors.initials: X
authors.lastname: Liang
mesh_terms: D000537:Aluminum Oxide; D002516:Ceramics; D017076:Computer-Aided Design; D018772:Dental Marginal Adaptation; D003776:Dental Porcelain; D017267:Dental Prosthesis Design; D006801:Humans; D008963:Molar; D019231:Tooth Preparation, Prosthodontic
chemical_list: D003776:Dental Porcelain; C074543:Cerec; D000537:Aluminum Oxide