title: Effect of tooth type and ferrule on the survival of pulpless teeth restored with fiber posts: a 3-year clinical study.
abstract: OBJECTIVE
  To determine, in a 3-year clinical trial, whether tooth type and ferrule significantly affect the survival of pulpless teeth restored with fiber posts.
  
  
  METHODS
  A sample of 87 teeth in 87 patients (32 men and 55 women, age ranged from 23 to 78) were restored using Snowpost: 34 incisors, 12 canines, 25 premolars and 16 molars. The posts were cemented with RelyXUnicem and the core was made with a resin composite (Dentocore Automix). Every tooth was covered with a metal-ceramic or all ceramic crown. Two experimental groups, according to the presence or absence of ferrule, were defined: A) 45 teeth with ferrule (>2 mm height); and B) 42 teeth without ferrule (<2 mm height). Patients were reevaluated every 6 months.
  
  
  RESULTS
  14 of the total restorations failed (16.1%). The failure modes were caries (n=4), post fracture (n=4), root fracture (n=2), and marginal gap, post cement failure, crown cement failure, and periapical lesion (n= 1 respectively). In Group A the failure observed was 6.67% and in Group B it was 26.20%. The log-rank test showed statistically significant differences between both groups. According to the type of tooth, the incisors were the teeth with the highest failure rate (73.52%), but Chi-square test showed no statistically significant differences among the four tooth types, perhaps because of the low number of the sample.
authors.affiliation: Department of Prosthetic Dentistry, School of Dentistry, University of Seville, Seville, Spain. davalos@us.es
authors.forename: Juan Carlos
authors.initials: JC
authors.lastname: Mancebo
authors.forename: Emilio
authors.initials: E
authors.lastname: Jiménez-Castellanos
authors.forename: Diego
authors.initials: D
authors.lastname: Cañadas
mesh_terms: D000328:Adult; D000368:Aged; D016009:Chi-Square Distribution; D003188:Composite Resins; D003442:Crowns; D019232:Dental Restoration Failure; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D053208:Kaplan-Meier Estimate; D008297:Male; D008875:Middle Aged; D011176:Post and Core Technique; D016016:Proportional Hazards Models; D019279:Resin Cements; D014070:Tooth; D019231:Tooth Preparation, Prosthodontic / Q000379:methods*; D019553:Tooth, Nonvital / Q000628:therapy*; D055815:Young Adult
chemical_list: D003188:Composite Resins; C483701:Rely X Unicem; D019279:Resin Cements