title: Influence of platform and abutment angulation on peri-implant bone. A three-dimensional finite element stress analysis.
abstract: The aim of this study was to evaluate stress distribution on the peri-implant bone, simulating the influence of Nobel Select implants with straight or angulated abutments on regular and switching platform in the anterior maxilla, by means of 3-dimensional finite element analysis. Four mathematical models of a central incisor supported by external hexagon implant (13 mm × 5 mm) were created varying the platform (R, regular or S, switching) and the abutments (S, straight or A, angulated 15°). The models were created by using Mimics 13 and Solid Works 2010 software programs. The numerical analysis was performed using ANSYS Workbench 10.0. Oblique forces (100 N) were applied to the palatine surface of the central incisor. The bone/implant interface was considered perfectly integrated. Maximum (σmax) and minimum (σmin) principal stress values were obtained. For the cortical bone the highest stress values (σmax) were observed in the RA (regular platform and angulated abutment, 51 MPa), followed by SA (platform switching and angulated abutment, 44.8 MPa), RS (regular platform and straight abutment, 38.6 MPa) and SS (platform switching and straight abutment, 36.5 MPa). For the trabecular bone, the highest stress values (σmax) were observed in the RA (6.55 MPa), followed by RS (5.88 MPa), SA (5.60 MPa), and SS (4.82 MPa). The regular platform generated higher stress in the cervical periimplant region on the cortical and trabecular bone than the platform switching, irrespective of the abutment used (straight or angulated).
authors.affiliation: 1  Araçatuba School of Dentistry, UNESP - Universidade Estadual Paulista, Araçatuba, SP, Brazil.
authors.forename: Ana Paula
authors.initials: AP
authors.lastname: Martini
authors.forename: Rosália Moreira
authors.initials: RM
authors.lastname: Barros
authors.forename: Amilcar Chagas Freitas
authors.initials: AC
authors.lastname: Júnior
authors.forename: Eduardo Passos
authors.initials: EP
authors.lastname: Rocha
authors.forename: Erika Oliveira
authors.initials: EO
authors.lastname: de Almeida
authors.forename: Cacilda Cunha
authors.initials: CC
authors.lastname: Ferraz
authors.forename: Maria Cristina Jimenez
authors.initials: MC
authors.lastname: Pellegrin
authors.forename: Rodolfo Bruniera
authors.initials: RB
authors.lastname: Anchieta
mesh_terms: D000539:Alveolar Process / Q000502:physiology*; D003198:Computer Simulation; D059605:Dental Implant-Abutment Design; D003799:Dental Stress Analysis / Q000379:methods; D020342:Finite Element Analysis; D006801:Humans; D021621:Imaging, Three-Dimensional; D007180:Incisor / Q000502:physiology; D003765:Models, Dental