title: 10-year survival evaluation for glass-fiber-supported postendodontic restoration: a prospective observational clinical study.
abstract: BACKGROUND
  Glass-fiber-reinforced endodontic posts (GFRPs), in combination with composite resin core materials, are commonly used to build up damaged endodontically treated teeth. However, long-term clinical data are scarce. Thus, the aim of this investigation was to evaluate the survival of 3 different GFRP systems, taking into account several other relevant factors.
  
  
  METHODS
  One-hundred forty-nine GFRPs in 122 patients were followed for up to 120 months. GFRPs were adhesively luted using the etch-and-rinse technique. The core was built with a chemically curing composite resin and restored according to the specific prosthetic treatment plan. Cox proportional hazards models were used to evaluate the association between clinical variables and the time until failure.
  
  
  RESULTS
  Within 10 years, 55 failures could be observed (annual failure rate = 4.6%) with the most frequent ones being post fracture, loss of post retention (both n = 17), endodontic problems (n = 7), and those resulting in tooth extraction (n = 10). Sixty posts could be followed up for 105 to 120 months (34 posts lost to follow-up, [mean (standard deviation) survival time: 74 (43) months]). In crude analyses, only the tooth type in favor of posterior teeth compared with anterior teeth and the number of remaining cavity walls (in favor of ≥ 1 compared with no wall) were significantly associated with the failure rate. Cox regression analysis revealed a significant hazard ratio of 2.0 (95% confidence interval, 1.1-3.5; P = .021) for tooth type in favor of posterior teeth.
  
  
  CONCLUSIONS
  The relatively high annual failure rate of GFRPs highlights that the treatment decision should take into account the most relevant factors as tooth type and the number of remaining cavity walls.
authors.affiliation: Department of Prosthetic Dentistry, Center of Dentistry, University of Ulm, Ulm, Germany. micha.naumann@gmx.de
authors.forename: Michael
authors.initials: M
authors.lastname: Naumann
authors.forename: Manja
authors.initials: M
authors.lastname: Koelpin
authors.forename: Florian
authors.initials: F
authors.lastname: Beuer
authors.forename: Hendrik
authors.initials: H
authors.lastname: Meyer-Lueckel
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002484:Cementation / Q000379:methods; D015331:Cohort Studies; D003188:Composite Resins / Q000737:chemistry; D003764:Dental Materials / Q000737:chemistry*; D017267:Dental Prosthesis Design; D017268:Dental Prosthesis Retention; D019232:Dental Restoration Failure; D005260:Female; D005500:Follow-Up Studies; D005898:Glass / Q000737:chemistry*; D006801:Humans; D008297:Male; D008422:Materials Testing; D008875:Middle Aged; D011176:Post and Core Technique / Q000295:instrumentation*; D011446:Prospective Studies; D012008:Recurrence; D012307:Risk Factors; D055116:Self-Curing of Dental Resins; D016019:Survival Analysis; D014081:Tooth Extraction; D019231:Tooth Preparation, Prosthodontic / Q000379:methods; D019553:Tooth, Nonvital / Q000628:therapy*; D055815:Young Adult
chemical_list: D003188:Composite Resins; D003764:Dental Materials; C009753:fiberglass