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-70-SETiOPlus3903 Finite Element Analysis of Implant-embedded MandibularModel From Patient DataPoster Presentation3:45 PM–5:00 PM Mar 25, 2017CC, First FloorAuthors:Authors:Roxana Stegaroiu(Presenter)Niigata University Graduate School of Medical and Dental SciencesKoichi Kurokawa, Niigata University Graduate School of Medical and Dental SciencesKazuhoYamada, Niigata University Medical and Dental HospitalYoshiaki Arai, Niigata University Medical and Dental HospitalHideyoshiNishiyama, Niigata University Graduate School of Medical and Dental SciencesShigeo Tanaka, Kanazawa University Institute of Science and EngineeringAbstract: Objectives: To construct a 3D finite element method (FEM) model with trabecularstructure from patient cone-beam computed tomography (CBCT) images obtained before implant surgery combined with micro-CT data from 2 implants and a superstructure, subsequently provided to the patient, and to analyze bone stress around implants under occlusalloads, as measured after superstructure set.Methods: This study was approved by the Ethics Committee of Niigata University Faculty of Dentistry. With the informed consent of a patient, CBCT data of her partially edentulous ridge, Dentistry. With the informed consent of a patient, CBCT data of her partially edentulous ridge, obtained for treatment planning purposes, were used in this study. To minimize artifacts, 2 implants of the same type with those subsequently placed in the patient (SETiOPlus, GC) were scanned by micro-CT and the 3D data were superimposed over the bone data, using programs for bone structure analysis (TRI/3D-BON, RATOC) and superimposition. On top of implants, 3D data from the micro-CT images of patient’s superstructure were superimposed and a 3D FEM model was constructed, using a 3D-FEM program (TRI/3D-FEM64, RATOC). After superstructure set, maximum bite forces at its occlusalcontact areas were measured by pressure-sensitive sheets (Dental Prescale, Fuji Photo Film) (total, 113.2 N), and this force distribution was used in sheets (Dental Prescale, Fuji Photo Film) (total, 113.2 N), and this force distribution was used in a stress analysis performed by the 3D-FEM program.Results: Bone structure and implant reproducibility in the 3D FEM model was high. While von Misesstress in cortical bone (maximum 21.7 MPa) concentrated mostly around the implant neck, stress in trabecularbone (maximum 14.5 MPa) was distributed over larger areas around the implants.Conclusions: By this method, CBCT data of the edentulous mandibularridge could be combined with separately obtained micro-CT implant and superstructure 3D data to construct a 3D FEM with separately obtained micro-CT implant and superstructure 3D data to construct a 3D FEM model in which trabecularstructure and implant shape were accurately reproduced, enabling a detailed stress analysis under forces as measured intraorally.This abstract is based on research that was funded entirely or partially by an outside source:JSPS KAKENHI Grant (#24592909, #16K11588)Disclosure Statement:The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: NONEI have read the IADR policy on licensing.Signed by Roxana StegaroiuReprinted with permission from the Journal of Dental Research, J Dent Res 96 (Spec Iss A):-70-abstract number 3903, https://iadr2017.zerista.com/event/member/331337, 2017
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