Photoelastic analysis of the influence of platform switching on stress distribution in implants.
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.
Pellizzer
Eduardo Piza
EP
Department of Dental Materials and Prosthodontics, Araçatuba School of Dentistry, São Paulo State University, Brazil. ed.pl@uol.com.br
Falcón-Antenucci
Rosse Mary
RM
de Carvalho
Paulo Sérgio Perri
PS
Santiago
Joel Ferreira
JF
de Moraes
Sandra Lúcia Dantas
SL
de Carvalho
Bruno Machado
BM
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
D002858:Chromium Alloys; D012117:Resins, Synthetic