title: [Three-dimensional finite element analysis of removable partial denture with periodontally compromised abutments].
abstract: OBJECTIVE
  To evaluate three-dimensional (3D) finite element (FE) modeling of different periodontally compromised unilateral distal extension removable partial denture (RPD) abutments using the data of a 3D non-contact digitizing scanner.
  
  
  METHODS
  FE models were established, and the following structures were simulated in the models: alveolar bone, mucosa, abutments, periodontal ligaments, framework and artificial teeth. The alveolar bone and periodontal ligaments around the distal abutment in the three models were designed as normal, with bone defect and with periodontal ligaments defect respectively.Vertical or buccally inclined forces of 50, 100, 100 N were applied on the artificial teeth of the RPD and the stress distributions on the supporting tissues were calculated.
  
  
  RESULTS
  Under vertical loading, the maximal stress on the alveolar bone of the abutment were as follows: periodontal ligaments defect model (3.57 MPa) > bone defect model (3.21 MPa) > normal model (2.63 MPa). Under buccally inclined loading, the maximal stress on the alveolar bone of the abutment were as follows: periodontal ligaments defect model (2.50 MPa) > bone defect model (2.41 MPa) > normal model (1.79 MPa). Under buccally inclined loading, the stresses on distal aspects of the residual alveolar ridge were higher than that of the vertical loading model.
  
  
  CONCLUSIONS
  3D non-contact digitalizing scanner was useful for the finite element modeling process of removable partial denture.
authors.affiliation: The State Key Laboratory Breeding Base of Basic Science of Stomatology & Key Laboratory of Oral Biomedicine Ministry of Education, School of Stomatology, Wuhan University, Wuhan 430079, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Wei
authors.forename: Bin-ting
authors.initials: BT
authors.lastname: Xu
authors.forename: Qing
authors.initials: Q
authors.lastname: Li
authors.forename: Yi-ning
authors.initials: YN
authors.lastname: Wang
mesh_terms: D000328:Adult; D000539:Alveolar Process / Q000502:physiology*; D003198:Computer Simulation; D000044:Dental Abutments; D003799:Dental Stress Analysis / Q000379:methods*; D003832:Denture, Partial, Removable; D020342:Finite Element Analysis; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods; D008297:Male; D010513:Periodontal Ligament / Q000502:physiology*; D014716:Vertical Dimension