title: Prognosis for abutment teeth of removable dentures: a retrospective study.
abstract: OBJECTIVE
  This retrospective study evaluates the clinical success of conical crown-retained removable dentures.
  
  
  METHODS
  Ninety-seven patients were treated with 97 dentures at the University of Frankfurt, Department of Prosthodontics, between 1993 and 2000. The average observation period was 4.9 +/- 2.8 years. The dentures were supported by 445 natural abutment teeth. To evaluate the long-term success of the restorations, the variables abutment loss, tooth mobility, mean probing depths, and radiological bone loss were used. Data were obtained by one clinical examiner at baseline, by systematic evaluation of patient records, and at clinical re-examinations. Survival-time methods were used to analyze time-to-event data. Specifically, the Cox model with frailty term was applied to account for correlations between intra-patient survival data. Thirty abutment teeth had to be extracted during the observation period.
  
  
  RESULTS
  Statistical analysis showed no significant effects of the variables tooth mobility (p= 0.42), mean probing depths (p= 0.23), and radiological bone loss (p= 0.59) on the time to tooth extraction. For the non-extracted abutment teeth significant changes during time for the variables tooth mobility (p < 0.0001) and radiological bone loss (p= 0.0240) were observed.
  
  
  CONCLUSIONS
  Removable partial dentures retained by conical crowns have a favorable clinical prognosis.
authors.affiliation: Department of Prosthodontics, School of Dentistry, Johann Wolfgang Goethe University, Frankfurt/Main, Germany. piwowarczyk@gmx.de
authors.forename: Andree
authors.initials: A
authors.lastname: Piwowarczyk
authors.forename: Kai-Christian
authors.initials: KC
authors.lastname: Köhler
authors.forename: Ralf
authors.initials: R
authors.lastname: Bender
authors.forename: Alfred
authors.initials: A
authors.lastname: Büchler
authors.forename: Hans-Christoph
authors.initials: HC
authors.lastname: Lauer
authors.forename: Peter
authors.initials: P
authors.lastname: Ottl
mesh_terms: D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging*; D000044:Dental Abutments; D003832:Denture, Partial, Removable; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D008297:Male; D008336:Mandibular Diseases / Q000000981:diagnostic imaging; D008439:Maxillary Diseases / Q000000981:diagnostic imaging; D008875:Middle Aged; D011859:Radiography; D013997:Time Factors; D016388:Tooth Loss / Q000000981:diagnostic imaging; D014086:Tooth Mobility / Q000000981:diagnostic imaging