title: Performance of titanium alloy sintered porous-surfaced (SPS) implants supporting mandibular overdentures during a 20-year prospective study.
abstract: OBJECTIVE
  This study was undertaken to assess short, sintered porous-surfaced (SPS), press-fit implants with mandibular overdentures to restore edentulous patients with severe mandibular resorption.
  
  
  METHODS
  Implant lengths of 7, 8, 9, and 10 mm were used, all with 2-mm polished collars, making the designed intrabony lengths 5, 6, 7, and 8 mm. Each patient received three non-splinted implants placed using a two-stage protocol.
  
  
  RESULTS
  Only 22 (with 53 implants) of the original 52 patients were available after 20 years. All but one of these patients was functioning with their implant-retained overdentures. Life table analysis accounted for all patients and implants, and showed a 20-year survival of 73.4%. Analysis of carefully standardized radiographs revealed mean cumulative bone loss after 20 years of 0.67 mm relative to the polished collar-SPS junction.
  
  
  CONCLUSIONS
  Short SPS implants with mandibular overdentures can provide an acceptable treatment over a 20-year period for fully edentulous patients with severe alveolar resorption.
authors.affiliation: Faculty of Dentistry, University of Toronto, Toronto, ON, Canada.
authors.forename: Douglas
authors.initials: D
authors.lastname: Deporter
authors.forename: Michael
authors.initials: M
authors.lastname: Pharoah
authors.forename: Simon
authors.initials: S
authors.lastname: Yeh
authors.forename: Reynaldo
authors.initials: R
authors.lastname: Todescan
authors.forename: Eshetu G
authors.initials: EG
authors.lastname: Atenafu
mesh_terms: D016301:Alveolar Bone Loss; D003722:Dental Alloys; D015921:Dental Implants; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D003828:Denture, Overlay; D005260:Female; D006801:Humans; D007575:Jaw, Edentulous / Q000534:rehabilitation; D008297:Male; D008334:Mandible / Q000601:surgery; D008422:Materials Testing; D008875:Middle Aged; D016062:Porosity; D011446:Prospective Studies; D013499:Surface Properties; D014025:Titanium; D016896:Treatment Outcome
chemical_list: D003722:Dental Alloys; D015921:Dental Implants; D014025:Titanium