title: Load distribution on abutment tooth, implant and residual ridge with distal-extension implant-supported removable partial denture.
abstract: OBJECTIVE
  The aim of this study was to evaluate the effect of implant location on load distribution in the abutment tooth, implant and residual ridge with a distal-extension implant-supported removable partial denture (ISRPD).
  
  
  METHODS
  A mandibular unilateral distal-extension edentulous simulation model was used. Implants were inserted at the second premolar (mesial implant) and second molar (distal implant) positions in the edentulous area. An experimental ISRPD was fabricated of acrylic resin with a cobalt-chromium alloy framework. Loads on the implants and abutment tooth were measured with piezoelectric force transducers. The load on the residual ridge was measured with pressure-sensitive film. A vertical load of 100N was applied at the first molar region. Measurements were made under the following three conditions: with conventional removable partial denture (CRPD), with mesial-implant-supported removable partial denture (MISRPD), and with distal-implant-supported removable partial denture (DISRPD). In each condition, the unused implants were made inactive by eliminating contact with the inner surface of the denture.
  
  
  RESULTS
  The load on the abutment tooth was greatest with DISRPD, followed by CRPD and MISRPD (P<0.01). The load on the implant was greater with DISRPD than with MISRPD (P<0.01). The load on the residual ridge was lowest with DISRPD, followed by MISRPD and CRPD (P<0.01).
  
  
  CONCLUSIONS
  This experimental study provided quantitative data regarding the effect of implant location on load distribution with ISRPDs. Further investigation regarding the effect of denture design on the load distribution is needed for determining the proper implant location of ISRPD.
authors.affiliation: Division of Advanced Prosthetic Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan.
authors.forename: Yoshiki
authors.initials: Y
authors.lastname: Matsudate
authors.affiliation: Division of Advanced Prosthetic Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan. Electronic address: nobuhiro.yoda.e2@tohoku.ac.jp.
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Yoda
authors.affiliation: Division of Advanced Prosthetic Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan.
authors.forename: Masahide
authors.initials: M
authors.lastname: Nanba
authors.affiliation: Division of Advanced Prosthetic Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan.
authors.forename: Toru
authors.initials: T
authors.lastname: Ogawa
authors.affiliation: Division of Advanced Prosthetic Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan.
authors.forename: Keiichi
authors.initials: K
authors.lastname: Sasaki
mesh_terms: D000539:Alveolar Process; D000044:Dental Abutments; D059605:Dental Implant-Abutment Design; D015921:Dental Implants; D019094:Dental Prosthesis, Implant-Supported; D003799:Dental Stress Analysis; D003779:Denture Design; D003832:Denture, Partial, Removable; D006801:Humans; D057893:Immediate Dental Implant Loading; D007575:Jaw, Edentulous; D008334:Mandible; D003765:Models, Dental
chemical_list: D015921:Dental Implants
keywords: Dental implant; Implant-supported removable partial denture; Load; Removable partial denture; Transducers