title: An up to 5-year clinical evaluation of posterior in-ceram CAD/CAM core crowns.
abstract: OBJECTIVE
  This study evaluated the clinical performance of posterior CAD/CAM-generated In-Ceram Alumina and In-Ceram Spinell core crowns.
  
  
  METHODS
  Nineteen In-Ceram Spinell core crowns (four premolars and 15 molars) and 24 In-Ceram Alumina core crowns (two premolars and 22 molars) in 21 patients were examined using modified USPHS criteria at baseline and after a mean service time of 39 +/- 11 months. The crown copings were machined from Vitablocs In-Ceram Alumina and Vitablocs In-Ceram Spinell using the Cerec 2 CAD/CAM system.
  
  
  RESULTS
  Two molar In-Ceram Alumina core crowns fractured after respective service times of 14 and 17 months in the same patient. The Kaplan-Meier survival rate regarding fracture of the ceramic was 92% for In-Ceram Alumina and 100% for In-Ceram Spinell. At the follow-up examination, 80% alpha ratings and 18% beta ratings for In-Ceram Alumina core crowns and 84% alpha ratings and 15% beta ratings for In-Ceram Spinell core crowns were recorded.
  
  
  CONCLUSIONS
  Despite the two fractures, the clinical quality of CAD/CAM-generated In-Ceram Alumina and In-Ceram Spinell posterior crowns was excellent. Within the limitations of this study, both types of crowns appeared to be feasible.
authors.affiliation: Clinic of the Division of Aesthetics and Computer Restorations, Department of Preventive Dentistry, Periodontology and Cariology, Center for Dental and Oral Medicine, University of Zurich, Switzerland. bindl@zzmk.unizh.ch
authors.forename: Andreas
authors.initials: A
authors.lastname: Bindl
authors.forename: Werner H
authors.initials: WH
authors.lastname: Mörmann
mesh_terms: D000328:Adult; D000368:Aged; D000537:Aluminum Oxide; D001641:Bicuspid; D017076:Computer-Aided Design; D003442:Crowns; D003776:Dental Porcelain; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D005260:Female; D006801:Humans; D008277:Magnesium Oxide; D008297:Male; D008875:Middle Aged; D008963:Molar; D016019:Survival Analysis
chemical_list: C111130:spinell; D003776:Dental Porcelain; D008277:Magnesium Oxide; D000537:Aluminum Oxide