title: A retrospective comparative 8-year study of cumulative complications in teeth adjacent to both natural and implant-supported fixed partial dentures.
abstract: OBJECTIVE
  To compare the complication rate of natural teeth adjacent to implant supported dentures (IFDs) with that of teeth serving as abutments for fixed partial dentures (FPDs). The second goal was to assess the risk factors for complications in teeth adjacent to bounded edentulous spaces.
  
  
  METHODS
  The study subjects were selected from patients who received prosthodontic treatment for their bounded edentulous space not exceeding two missing teeth between February 1990 and March 2007. Sixty-one patients were included in the IFD group and 66 patients were included in the FPD group. Tooth complications were defined as tooth extraction, periodontal lesion, periapical lesion, and loss of prosthesis and were assessed by one examiner based on dental records.
  
  
  RESULTS
  The 8-year cumulative complication rate for the IFD group (7.9%) was significantly lower than for the FPD group (40.7%). Additionally, the 8-year cumulative complication rate of vital teeth (6%) was significantly lower than that of nonvital teeth (45.9%). A cox proportional hazard analysis revealed that nonvitality of dental pulp was a significant risk factor for tooth complications, whereas treatment modality was not.
  
  
  CONCLUSIONS
  Teeth adjacent to IFD-treated edentulous spaces presented fewer complications than natural teeth serving as abutments for FPDs. Conservation of teeth adjacent to edentulous spaces as vital teeth was the key finding to limit further tooth loss.
authors.affiliation: Department of Oral Rehabilitation and Regenerative Medicine, Okayama University Graduate School of Medicine, Okayama, Japan.
authors.forename: Seiya
authors.initials: S
authors.lastname: Yamazaki
authors.forename: Hikaru
authors.initials: H
authors.lastname: Arakawa
authors.forename: Kenji
authors.initials: K
authors.lastname: Maekawa
authors.forename: Kinji
authors.initials: K
authors.lastname: Noda
authors.forename: Emilio Satoshi
authors.initials: ES
authors.lastname: Hara
authors.forename: Hajime
authors.initials: H
authors.lastname: Minakuchi
authors.forename: Wataru
authors.initials: W
authors.lastname: Sonoyama
authors.forename: Yoshizo
authors.initials: Y
authors.lastname: Matsuka
authors.forename: Takuo
authors.initials: T
authors.lastname: Kuboki
mesh_terms: D000328:Adult; D000368:Aged; D016009:Chi-Square Distribution; D019094:Dental Prosthesis, Implant-Supported / Q000009:adverse effects*; D019232:Dental Restoration Failure; D003830:Denture, Partial, Fixed / Q000009:adverse effects*; D005260:Female; D006801:Humans; D053208:Kaplan-Meier Estimate; D008297:Male; D008875:Middle Aged; D010483:Periapical Diseases / Q000209:etiology*; D010518:Periodontitis / Q000209:etiology*; D016016:Proportional Hazards Models; D012189:Retrospective Studies; D012307:Risk Factors; D018709:Statistics, Nonparametric; D016388:Tooth Loss / Q000209:etiology*; D019553:Tooth, Nonvital / Q000209:etiology*