title: Photoelastic analysis of the influence of platform switching on stress distribution in implants.
abstract: The aim of this study was to evaluate the stress distribution of platform switching implants using a photoelastic method. Three models were constructed of the photoelastic resin PL-2, with a single implant and a screw-retained implant-supported prosthesis. These models were Model A, platform 5.0 mm/abutment 4.1 mm; Model B, platform 4.1 mm/abutment 4.1 mm; and Model C, platform 5.00 mm/abutment 5.00 mm. Axial and oblique (45°) loads of 100 N were applied using a Universal Testing Machine (EMIC DL 3000). Images were photographed with a digital camera and visualized with software (AdobePhotoshop) to facilitate the qualitative analysis. The highest stress concentrations were observed at the apical third of the 3 models. With the oblique load, the highest stress concentrations were located at the implant apex, opposite the load application. Stress concentrations decreased in the cervical region of Model A (platform switching), and Models A (platform switching) and C (conventional/wide-diameter) displayed similar stress magnitudes. Finally, Model B (conventional/regular diameter) displayed the highest stress concentrations of the models tested.
authors.affiliation: Department of Dental Materials and Prosthodontics, Araçatuba School of Dentistry, São Paulo State University, Brazil. ed.pl@uol.com.br
authors.forename: Eduardo Piza
authors.initials: EP
authors.lastname: Pellizzer
authors.forename: Rosse Mary
authors.initials: RM
authors.lastname: Falcón-Antenucci
authors.forename: Paulo Sérgio Perri
authors.initials: PS
authors.lastname: de Carvalho
authors.forename: Joel Ferreira
authors.initials: JF
authors.lastname: Santiago
authors.forename: Sandra Lúcia Dantas
authors.initials: SL
authors.lastname: de Moraes
authors.forename: Bruno Machado
authors.initials: BM
authors.lastname: de Carvalho
mesh_terms: D001696:Biomechanical Phenomena; D001732:Bite Force; D002858:Chromium Alloys / Q000737:chemistry; D003196:Computer Graphics; D000044:Dental Abutments; D019250:Dental Implants, Single-Tooth; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D003799:Dental Stress Analysis / Q000295:instrumentation; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008422:Materials Testing; D008953:Models, Anatomic; D010781:Photography; D012117:Resins, Synthetic / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties
chemical_list: D002858:Chromium Alloys; D012117:Resins, Synthetic