title: [3-D FEA of the stress state of abutment and its periodontal tissue with three different retention styles in the absence of mandibular anterior teeth].
abstract: OBJECTIVE
  To study the stress of the abutment and its periodontal tissue with different designs of retainer (type of retainer, place)in the same situation of dentural defect.
  
  
  METHODS
  Based on the 3-D FEA database of RPD, the stress state of the abutment and its periodontal tissue was analyzed to choose the optimal retainer with the same situation of dentural defect.
  
  
  RESULTS
  With three different retainer designs, the retainer on the second premolar and the first molar exerted the smallest stress on the abutment and its periodontal tissue, while the retainer on the first premolar and the first molar had the largest stress.
  
  
  CONCLUSIONS
  Analysis for the health condition of abutment and its periodontal tissue is imperative for the selection of different designs of retainers.
authors.affiliation: Department of Prosthodontics, School of Stomatology, Ninth People's Hospital, Shanghai Jiaotong University, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Zhao
authors.forename: Bin
authors.initials: B
authors.lastname: Wei
authors.forename: Ling
authors.initials: L
authors.lastname: Li
authors.forename: Fu-qiang
authors.initials: FQ
authors.lastname: Zhang
mesh_terms: D001641:Bicuspid; D000044:Dental Abutments; D003779:Denture Design; D003832:Denture, Partial, Removable; D006801:Humans; D008963:Molar; D010519:Periodontium; D014070:Tooth