title: Survival rates of teeth, implants, and double crown-retained removable dental prostheses: a systematic literature review.
abstract: OBJECTIVE
  The aim of this systematic literature review was to investigate the survival rates of teeth, implants, and double crown-retained removable dental prostheses (RDPs).
  
  
  METHODS
  A systematic review of the literature published from January 1973 through May 2010 was conducted using electronic databases and hand-searching to assess the clinical outcomes of teeth, implants, and double crown-retained RDPs.
  
  
  RESULTS
  This review yielded 512 articles, which were narrowed down to 11. The included studies demonstrated tooth survival rates between 60.6% and 95.3% after an observation period of 4 to 10 years. The survival rates of RDPs supported by teeth ranged between 90.0% and 95.1% after 4 and 5.3 years, respectively. The survival rates of implants supporting prostheses in the mandible were between 97% and 100% after an observation period between 3 and 10.4 years. The survival rates of implant-retained RDPs in the mandible ranged between 95% and 100% after 9 and 10.4 years. Teeth and implants supporting prostheses in the maxilla, as well as the RDPs themselves, demonstrated a survival rate of 100% after 3.2 years.
  
  
  CONCLUSIONS
  The current literature does not provide sufficient information regarding the long-term outcome of double crown-retained RDPs. Further studies based on a higher level of evidence are needed to validate the outcomes of this treatment modality.
authors.affiliation: Department of Prosthodontics, Albert-Ludwigs University, Freiburg, Germany. beatrice.koller@uniklinik-freiburg.de
authors.forename: Beatrice
authors.initials: B
authors.lastname: Koller
authors.forename: Wael
authors.initials: W
authors.lastname: Att
authors.forename: Jorg-Rudolf
authors.initials: JR
authors.lastname: Strub
mesh_terms: D003442:Crowns; D000044:Dental Abutments; D015921:Dental Implants; D019094:Dental Prosthesis, Implant-Supported; D003779:Denture Design; D003781:Denture Retention; D003828:Denture, Overlay; D003832:Denture, Partial, Removable; D006801:Humans; D016019:Survival Analysis; D014070:Tooth; D016896:Treatment Outcome
chemical_list: D015921:Dental Implants