title: Comparison of stress distribution between complete denture and implant-retained overdenture-2D FEA.
abstract: The aim of this study was to compare the stress distribution induced by posterior functional loads on conventional complete dentures and implant-retained overdentures with different attachment systems using a two-dimentional Finite Element Analysis (FEA-2D). Three models representative of edentulous mandible were constructed on AutoCAD software; Group A (control), a model of edentulous mandible supporting a complete denture; Group B, a model of edentulous mandible supporting an overdenture over two splinted implants connected with the bar-clip system; Group C, a model of edentulous mandible supporting an overdenture over two unsplinted implants with the O-ring system. Evaluation was conducted on Ansys software, with a vertical force of 100 N applied on the mandibular left first molar. When the stress was evaluated in supporting tissues, groups B (51.0 MPa) and C (52.6 MPa) demonstrated higher stress values than group A (10.1 MPa). Within the limits of this study, it may be concluded that the use of an attachment system increased stress values; furthermore, the use of splinted implants associated with the bar-clip attachment system favoured a lower stress distribution over the supporting tissue than the unsplinted implants with an O-ring abutment to retain the mandibular overdenture.
authors.affiliation: Department of Dental Materials and Prosthodontics, Araçatuba Dental School, São Paulo State University (UNESP), São Paulo, Brazil. wirley@foa.unesp.br
authors.forename: W G
authors.initials: WG
authors.lastname: Assunção
authors.forename: L F
authors.initials: LF
authors.lastname: Tabata
authors.forename: V A R
authors.initials: VA
authors.lastname: Barão
authors.forename: E P
authors.initials: EP
authors.lastname: Rocha
mesh_terms: D019094:Dental Prosthesis, Implant-Supported; D003799:Dental Stress Analysis / Q000379:methods; D003779:Denture Design; D003781:Denture Retention / Q000379:methods; D003824:Denture, Complete; D003828:Denture, Overlay; D006801:Humans; D008422:Materials Testing / Q000379:methods; D008953:Models, Anatomic; D013314:Stress, Mechanical