title: [Influence of implant-abutment connection mode on stress distribution in peri-implant bone].
abstract: OBJECTIVE
  To investigate the influence of butt joint connection and platform switching design of implant-abutment connection on the stress distribution in peri-implant bone.
  
  
  METHODS
  Three-dimensional finite element models of implant-supported mandibular first molar with different implant-abutment connections were computed by COSMOSM 2.85. Traditional butt joint connection was used in model A and platform switching design in model B. Loading conditions were a vertical load of 200 N and inclined load of the same magnitude at 45 degrees to the vertical axis of the implant. Stress distribution in peri-implant bone and von Mises stresses at the same point of buccal and lingual implant-bone interfaces in two models were compared.
  
  
  RESULTS
  Stresses concentrated in peri-implant cortical bone at the neck of implants on the buccal and lingual sides; maximum von Mises stresses under inclined load were higher than those under vertical load. Maximum von Mises stress in bone was 11.61 MPa in model A and 7.15 MPa in model B under vertical load, and 22.07 MPa in model A and 11.87 MPa in model B under inclined load respectively. Von Mises stresses decreased as the distance from implant-abutment junction increased and the most obvious change occurred at the interface between cortical bone and spongy bone. Von Mises stresses at the same points of buccal and lingual implant-bone interfaces in model A were higher than those in model B.
  
  
  CONCLUSIONS
  Compared with butt joint connection, platform switching design improved the stress distribution and decreased the maximum stresses in peri-implant bone around implant cervix.
authors.affiliation: Department of Oral Implantology, School of Stomatology, Wuhan University, Wuhan 430079, China.
authors.forename: Xue-jun
authors.initials: XJ
authors.lastname: Liu
authors.forename: Zhi-yong
authors.initials: ZY
authors.lastname: Li
authors.forename: Hai-bin
authors.initials: HB
authors.lastname: Xia
mesh_terms: D001842:Bone and Bones / Q000502:physiology* / Q000503:physiopathology*; D000044:Dental Abutments; D003757:Dental Implantation; D015921:Dental Implants; D020342:Finite Element Analysis; D008954:Models, Biological; D013314:Stress, Mechanical
chemical_list: D015921:Dental Implants