title: A 10-year retrospective study of the survival rate of teeth restored with metal prefabricated posts versus cast metal posts and cores.
abstract: OBJECTIVE
  The aim of this retrospective study was to compare the cumulative survival rate of teeth restored with prefabricated posts and with cobalt-chrome cast post-cores.
  
  
  METHODS
  112 endodontically treated teeth restored with prefabricated post and cobalt-chrome cast post-and-cores were evaluated. Teeth were considered as failures when were objective or radiologic sign of endodontic failure, post or root fracture, or when they had been extracted at the moment of the evaluation. Kaplan-Meier's method was used to reconstruct the survival curves of the restorations and to test the variable type of post-and-core restoration.
  
  
  RESULTS
  93 of the posts were still in function without clinical or radiographic signs of failure at the time of the examination resulting in a survival rate of 83.03% after a mean follow-up period of 10.08 years. When comparing the two techniques, prefabricated posts showed a slightly higher survival rate: 84.6% versus 82.6%.Focusing on tooth-type, maxillary premolars (n=30) had the highest failure rate (30%) and also the lowest mean lifetime, with 6-and-a-half years. Maxillary incisors (n=20) showed the highest success rate (5%) with only one case of failure.
  
  
  CONCLUSIONS
  The results showed no significant difference between both groups after a 10-year average follow-up.
authors: Department of Bucofacial Prosthesis, Faculty of Dentistry, University Complutense, Madrid, Spain. mgpolo@odon.um.com
authors: Miguel
authors: M
authors: Gómez-Polo
authors: Blanca
authors: B
authors: Llidó
authors: Antonia
authors: A
authors: Rivero
authors: Jaime
authors: J
authors: Del Río
authors: Alicia
authors: A
authors: Celemín
mesh_terms: D000328:Adult; D001641:Bicuspid / Q000473:pathology; D002858:Chromium Alloys / Q000737:chemistry; D003442:Crowns; D003481:Cuspid / Q000473:pathology; D000044:Dental Abutments; D003731:Dental Caries / Q000209:etiology; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D005260:Female; D005500:Follow-Up Studies; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D007180:Incisor / Q000473:pathology; D008297:Male; D016876:Metal Ceramic Alloys; D008875:Middle Aged; D011176:Post and Core Technique / Q000295:instrumentation*; D012189:Retrospective Studies; D012390:Root Canal Therapy / Q000009:adverse effects; D012737:Sex Factors; D016019:Survival Analysis; D014081:Tooth Extraction; D014082:Tooth Fractures / Q000209:etiology; D014092:Tooth Root / Q000293:injuries; D019553:Tooth, Nonvital / Q000628:therapy; D016896:Treatment Outcome; D015036:Zinc Phosphate Cement / Q000737:chemistry
chemical_list: D002858:Chromium Alloys; D005899:Glass Ionomer Cements; D016876:Metal Ceramic Alloys; D015036:Zinc Phosphate Cement