title: The influence of gender and age on fixed prosthetic restoration longevity: an up to 18- to 20-year follow-up in an undergraduate clinic.
abstract: OBJECTIVE
  This study investigated the possible relationship between the survival of complete crowns (CCs), 3-unit fixed dental prostheses (3uFDPs), and fixed dental prostheses (FDPs) versus gender and age at initial treatment over a period of 18 to 20 years in an undergraduate clinic.
  
  
  METHODS
  Complete treatment and follow-up records of 1,037 CCs (60.5% women/39.5% men; age range: 18 to 82 years), 134 3uFDPs (59.2% women/40.8% men; age range: 33.6 to 93.6 years), and 322 FDPs (62.1% women/37.9% men; age range: 33.6 to 94.2 years) were available for analysis. Failures of the fixed prosthetic restorations were defined as irreversible complications (finish line involved or loss of CCs, FDPs, or abutments).
  
  
  RESULTS
  The association between gender versus irreversible complications for the CCs (P = .481), 3uFDPs (P= .814), and FDPs (P = .410) groups was not statistically significant. The relationship between age versus irreversible complications for the fixed prosthetic restorations was statistically significant for all test groups. The patients with the failing restorations (66.2 years; mean range: 64.8 to 67.5 years) were 4.5 to 5.5 years older at initial treatment than the patients with the surviving restorations (61.3 years; mean range: 59.5 to 63.0 years).
  
  
  CONCLUSIONS
  There was no relationship between gender and irreversible complications. There was a clear statistically significant association between age and irreversible complications. Receiver operating characteristic analysis for all study groups revealed that for age, no clear cutoff point exists with acceptable specificity and sensitivity.
authors: Centre for Special Care, PaeCaMed Research, Unit of Gnathology and Temporomandibular Disorders, Dental School, Faculty of Medicine and Health Sciences, Ghent University, Belgium. Hein.Debacker@skynet.be
authors: Hein
authors: H
authors: De Backer
authors: Georges
authors: G
authors: Van Maele
authors: Nathalie
authors: N
authors: De Moor
authors: Linda
authors: L
authors: Van den Berghe
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D003442:Crowns; D019232:Dental Restoration Failure; D003830:Denture, Partial, Fixed; D005260:Female; D006047:Gold Alloys; D006801:Humans; D053208:Kaplan-Meier Estimate; D008297:Male; D016876:Metal Ceramic Alloys; D008875:Middle Aged; D012189:Retrospective Studies; D012737:Sex Factors; D018709:Statistics, Nonparametric
chemical_list: D006047:Gold Alloys; D016876:Metal Ceramic Alloys