title: Stress Distribution in Single Dental Implant System: Three-Dimensional Finite Element Analysis Based on an In Vitro Experimental Model.
abstract: This study aimed to analyze the stress distribution in single implant system and to evaluate the compatibility of an in vitro model with finite element (FE) model. The in vitro model consisted of Brånemark implant; multiunit set abutment of 5 mm height; metal-ceramic screw-retained crown, and polyurethane simulating the bone. Deformations were recorded in the peri-implant region in the mesial and distal aspects, after an axial 300 N load application at the center of the occlusal aspect of the crown, using strain gauges. This in vitro model was scanned with micro CT to design a three-dimensional FE model and the strains in the peri-implant bone region were registered to check the compatibility between both models. The FE model was used to evaluate stress distribution in different parts of the system. The values obtained from the in vitro model (20-587 με) and the finite element analysis (81-588 με) showed agreement among them. The highest stresses because of axial and oblique load, respectively were 5.83 and 40 MPa for the cortical bone, 55 and 1200 MPa for the implant, and 80 and 470 MPa for the abutment screw. The FE method proved to be effective for evaluating the deformation around single implant. Oblique loads lead to higher stress concentrations.
authors.affiliation: *Department of Prosthodontics, Bauru School of Dentistry-University of Sao Paulo †Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry-University of Sao Paulo ‡Department of Mechanical Engineering, School of Engineering, São Paulo State University, São Paulo, Brazil.
authors.forename: Carlos Eduardo Edwards
authors.initials: CE
authors.lastname: Rezende
authors.forename: Melody
authors.initials: M
authors.lastname: Chase-Diaz
authors.forename: Max Doria
authors.initials: MD
authors.lastname: Costa
authors.forename: Max Laurent
authors.initials: ML
authors.lastname: Albarracin
authors.forename: Gabriela
authors.initials: G
authors.lastname: Paschoeto
authors.forename: Edson Antonio Capello
authors.initials: EA
authors.lastname: Sousa
authors.forename: José Henrique
authors.initials: JH
authors.lastname: Rubo
authors.forename: Ana Flávia Sanches
authors.initials: AF
authors.lastname: Borges
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry; D001696:Biomechanical Phenomena; D002858:Chromium Alloys / Q000737:chemistry; D003198:Computer Simulation; D003442:Crowns; D059605:Dental Implant-Abutment Design; D019250:Dental Implants, Single-Tooth; D003776:Dental Porcelain / Q000737:chemistry; D019094:Dental Prosthesis, Implant-Supported; D003799:Dental Stress Analysis / Q000295:instrumentation; D020342:Finite Element Analysis; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008334:Mandible / Q000502:physiology; D008422:Materials Testing; D016876:Metal Ceramic Alloys / Q000737:chemistry; D008953:Models, Anatomic; D008954:Models, Biological; D017680:Potassium Compounds / Q000737:chemistry; D013314:Stress, Mechanical; D055114:X-Ray Microtomography / Q000379:methods
chemical_list: D000538:Aluminum Silicates; D002858:Chromium Alloys; D016876:Metal Ceramic Alloys; D017680:Potassium Compounds; D003776:Dental Porcelain; C016447:feldspar