title: Influence of loading positions of mandibular unilateral distal extension removable partial dentures on movements of abutment tooth and denture base.
abstract: OBJECTIVE
  The aim of our study was to explore the effects of different loading positions on the movements of the abutment tooth and denture base of removable partial denture with unilaterally designed framework (RPD-U).
  
  
  METHODS
  The experiment was carried out with a simulation model of a mandible without left molars. The movements of abutment tooth and denture base of the unilateral and bilateral designs were due to 30N vertical load on 12 loading positions determined with a strain gauge circuitry. The effects of loading positions on the movements of the abutment tooth and denture base were compared between two designs.
  
  
  RESULTS
  During the loading on buccal, lingual positions, and the most disto-central position the movements of the abutment tooth and denture base of the unilateral design were significantly greater than those of the bilateral design (P < 0.01). During the loading on the three mesio-central positions the movements of the abutment tooth and denture base were equal between designs, and were significantly lower than during the loading on the other positions (P < 0.01).
  
  
  CONCLUSIONS
  Ending the denture teeth at the mesial cusp of second molar and positioning the occlusal contacts over the ridge crest adequately stabilize the abutment tooth and denture base of RPD-U.
authors.affiliation: Department of Masticatory Function Rehabilitation, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan. jkl.rpro@tmd.ac.jp
authors.forename: Xilin
authors.initials: X
authors.lastname: Jin
authors.forename: Masayuki
authors.initials: M
authors.lastname: Sato
authors.forename: Akira
authors.initials: A
authors.lastname: Nishiyama
authors.forename: Takashi
authors.initials: T
authors.lastname: Ohyama
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D001641:Bicuspid / Q000502:physiology; D003481:Cuspid / Q000502:physiology; D000044:Dental Abutments; D016734:Dental Clasps; D003799:Dental Stress Analysis; D003819:Denture Bases; D003779:Denture Design; D003781:Denture Retention; D003832:Denture, Partial, Removable; D006047:Gold Alloys / Q000737:chemistry; D006801:Humans; D008334:Mandible; D008953:Models, Anatomic; D009068:Movement; D010984:Platinum / Q000737:chemistry; D013314:Stress, Mechanical; D016474:Weight-Bearing
chemical_list: D000180:Acrylic Resins; D006047:Gold Alloys; D010984:Platinum