title: Retrospective comparative ten-year study of cumulative survival rates of remaining teeth in large edentulism treated with implant-supported fixed partial dentures or removable partial dentures.
abstract: OBJECTIVE
  This study aimed to compare the survival rates of remaining teeth between implant-supported fixed dentures (IFDs) and removable partial dentures (RPDs) in patients with large edentulous cases. The second goal was to assess the risk factors for remaining tooth loss.
  
  
  METHODS
  The study subjects were selected among those who received prosthodontic treatment at Okayama University Dental Hospital for their edentulous space exceeding at least four continuous missing teeth. Twenty-one patients were included in the IFD group and 82 patients were included in the RPD group. Survival rates of remaining teeth were calculated in three subcategories: (1) whole remaining teeth, (2) adjacent teeth to intended edentulous space, and (3) opposing teeth to intended edentulous space.
  
  
  RESULTS
  The ten-year cumulative survival rate of the whole remaining teeth was significantly higher in the IFD group (40.0%) than in the RPD group (24.4%). On the other hand, there was no significant difference between two groups in the survival rate of teeth adjacent or opposing to intended edentulous space. A Cox proportional hazard analysis revealed that RPD restoration and gender (male) were the significant risk factors for remaining tooth loss (whole remaining teeth).
  
  
  CONCLUSIONS
  These results suggest that IFD treatment can reduce the incidence of remaining tooth loss in large edentulous cases.
authors.affiliation: Department of Oral Rehabilitation and Regenerative Medicine, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Okayama 700-8525, 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: Emilio Satoshi
authors.initials: ES
authors.lastname: Hara
authors.forename: Kinji
authors.initials: K
authors.lastname: Noda
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; D001732:Bite Force; D015921:Dental Implants / Q000009:adverse effects*; D019094:Dental Prosthesis, Implant-Supported / Q000009:adverse effects*; D003830:Denture, Partial, Fixed / Q000009:adverse effects*; D003832:Denture, Partial, Removable / Q000009:adverse effects*; D005260:Female; D006801:Humans; D007576:Jaw, Edentulous, Partially / Q000628:therapy*; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012307:Risk Factors; D013997:Time Factors; D016388:Tooth Loss / Q000453:epidemiology* / Q000209:etiology*
chemical_list: D015921:Dental Implants
keywords: Implant-supported fixed denture; Remaining teeth; Removal partial denture; Risk factor; Survival rate