title: Six-year clinical performance of all-ceramic crowns with alumina cores.
abstract: OBJECTIVE
  The aim of the study was to evaluate the clinical performance of Procera Alumina AllCeram crowns (Nobel Biocare).
  
  
  METHODS
  In 70 patients, 61 anterior and 46 posterior teeth were provided with single crowns and cemented with a glass-ionomer cement.
  
  
  RESULTS
  Four patients were lost to follow-up. Six crowns had to be removed, all because of nonreparable fracture. At 6 years, the cumulative survival rate was 94.3% for all crowns, 96.7% for anterior crowns, and 91.3% for posterior crowns (survival = not removed). Most of the defects occurred within the first 1.5 years.
  
  
  CONCLUSIONS
  The findings indicate a good clinical prognosis of both anterior and posterior Procera Alumina crowns.
authors.affiliation: Department of Prosthetic Dentistry, School of Dentistry, Dresden University of Technology, Germany. michael.walter@uniklinikum-dresden.de
authors.forename: Michael H
authors.initials: MH
authors.lastname: Walter
authors.forename: Burkhard H
authors.initials: BH
authors.lastname: Wolf
authors.forename: Annette E
authors.initials: AE
authors.lastname: Wolf
authors.forename: Klaus W
authors.initials: KW
authors.lastname: Boening
mesh_terms: D000328:Adult; D000537:Aluminum Oxide; D002484:Cementation; D003442:Crowns; D003776:Dental Porcelain; D019232:Dental Restoration Failure; D005260:Female; D005899:Glass Ionomer Cements; D006801:Humans; D008277:Magnesium Oxide; D008297:Male; D011076:Polycarboxylate Cement; D016019:Survival Analysis; D015034:Zinc Oxide
chemical_list: C105314:AllCeram; D005899:Glass Ionomer Cements; D011076:Polycarboxylate Cement; D003776:Dental Porcelain; D008277:Magnesium Oxide; C040235:Ketac-cem; D000537:Aluminum Oxide; D015034:Zinc Oxide