title: Influence of implant angulation with different crowns on stress distribution.
abstract: The aim of this study was to perform a photoelastic analysis of stress distribution on straight and angulated implants with different crowns (screwed and cemented). Three models were made of photoelastic resin PL-2: model 1: external hexagon implant 3.75×10.00 mm at 0 degrees; model 2: external hexagon implant 3.75×10.00 mm at 17 degrees; model 3: external hexagon implant 3.75×10.00 mm at 30 degrees. Axial and oblique (45 degrees) load (100 N) was applied with a universal testing machine. The photoelastic fringes on the models were recorded with a digital camera and visualized in a graphic software for qualitative analysis. The axial loading generated the same pattern of stress distribution. The highest stresses were concentrated between medium and apical thirds. The oblique loading generated a similar pattern of stress distribution in the models with similar implant angulation; the highest stress was located on the cervical region opposite to implant angulation and on the apical third. It was concluded that the higher the implant angulation, the higher the stress value, independent of crown type. The screwed prostheses exhibited the highest stress concentration. The oblique load generated higher stress value and concentration than the axial load.
authors.affiliation: Department of Dental Materials and Prosthodontics, Araçatuba School of Dentistry, São Paulo State University-UNESP, São Paulo, 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: Daniela Mayumi Inatomi Kavano
authors.initials: DM
authors.lastname: Sánchez
authors.forename: Gabriel Augusto Tozo
authors.initials: GA
authors.lastname: Rinaldi
authors.forename: Carolina Calles
authors.initials: CC
authors.lastname: de Aguirre
authors.forename: Marcelo Coelho
authors.initials: MC
authors.lastname: Goiato
mesh_terms: D001696:Biomechanical Phenomena; D001732:Bite Force; D002484:Cementation; D003442:Crowns; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D003799:Dental Stress Analysis / Q000379:methods*; D004548:Elasticity; D006801:Humans; D003765:Models, Dental