title: Finite element analysis of implant-supported prosthesis with pontic and cantilever in the posterior maxilla.
abstract: The aim of this study was to evaluate the influence of pontic and cantilever designs (mesial and distal) on 3-unit implant-retained prosthesis at maxillary posterior region verifying stress and strain distributions on bone tissue (cortical and trabecular bones) and stress distribution in abutments, implants and fixation screws, under axial and oblique loadings, by 3D finite element analysis. Each model was composed of a bone block presenting right first premolar to the first molar, with three or two external hexagon implants (4.0 × 10 mm), supporting a 3-unit splinted dental fixed dental prosthesis with the variations: M1 - three implants supporting splinted crowns; M2 - two implants supporting prosthesis with central pontic; M3 - two implants supporting prosthesis with mesial cantilever; M4 - two implants supporting prosthesis with distal cantilever. The applied forces were 400 N axial and 200 N oblique. The von Mises criteria was used to evaluate abutments, implants and fixation screws and maximum principal stress and microstrain criteria were used to evaluate the bone tissue. The decrease of the number of implants caused an unfavorable biomechanical behavior for all structures (M2, M3, M4). For two implant-supported prostheses, the use of the central pontic (M2) showed stress and strain distributions more favorable in the analyzed structures. The use of cantilever showed unfavorable biomechanical behavior (M3 and M4), mainly for distal cantilever (M4). The use of three implants presented lower values of stress and strain on the analyzed structures. Among two implant-supported prostheses, prostheses with cantilever showed unfavorable biomechanical behavior in the analyzed structures, especially for distal cantilever.
authors.affiliation: a Graduate Program in Dentistry, Department of Dental Materials and Prosthodontics , Araçatuba Dental School, UNESP - Univ Estadual Paulista , Araçatuba , Brazil.
authors.forename: Victor Eduardo
authors.initials: VE
authors.lastname: de Souza Batista
authors.affiliation: b Department of Dental Materials and Prosthodontics, Araçatuba Dental School , UNESP - Univ Estadual Paulista , Araçatuba , Brazil.
authors.forename: Fellippo Ramos
authors.initials: FR
authors.lastname: Verri
authors.affiliation: c School of Dentistry, Federal University of Alfenas - UNIFAL-MG , Alfenas , Brazil.
authors.forename: Daniel Augusto de Faria
authors.initials: DA
authors.lastname: Almeida
authors.affiliation: d Department of Health Sciences , University of Sacred Heart - USC , Bauru , Brazil.
authors.forename: Joel Ferreira
authors.initials: JF
authors.lastname: Santiago Junior
authors.affiliation: a Graduate Program in Dentistry, Department of Dental Materials and Prosthodontics , Araçatuba Dental School, UNESP - Univ Estadual Paulista , Araçatuba , Brazil.
authors.forename: Cleidiel Aparecido Araújo
authors.initials: CA
authors.lastname: Lemos
authors.affiliation: e Department of Dental Materials and Prosthodontics, Araçatuba Dental School , UNESP - Univ Estadual Paulista , Araçatuba , Brazil.
authors.forename: Eduardo Piza
authors.initials: EP
authors.lastname: Pellizzer
mesh_terms: D001863:Bone Screws; D003442:Crowns; D015921:Dental Implants; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D003799:Dental Stress Analysis; D003830:Denture, Partial, Fixed; D020342:Finite Element Analysis; D006801:Humans; D008437:Maxilla / Q000601:surgery*; D008962:Models, Theoretical; D013314:Stress, Mechanical
chemical_list: D015921:Dental Implants
keywords: Finite element analysis; biomechanical phenomena; dental implant