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Please use this identifier to cite or link to this item: http://hdl.handle.net/10564/3331

Title: Biomechanical analysis of immediately loaded implants according to the "All-on-Four" concept.
Other Titles: “All-on-Four”コンセプトに基づいて即時荷重を適用したインプラントの力学解析
Authors: Horita, Satoshi
Sugiura, Tsutomu
Yamamoto, Kazuhiko
Murakami, Kazuhiro
Imai, Yuichiro
Kirita, Tadaaki
Keywords: All-on-Four concept
Finite element analysis
Immediate loading
Cantilever loading
Framework material
Issue Date: 5-Sep-2016
Publisher: Elsevier
Citation: Journal of prosthodontic research Epub ahead of print (2016 Sep 5)
Abstract: PURPOSE: The purpose of this study was to investigate the biomechanical behavior of immediately loaded implants in an edentulous mandible according to the "All-on-Four" concept. METHODS: A 3D-finite element model of an edentulous mandible was constructed. Four implants were placed between the bilateral mental foramen according to "All-on-Four" concept. A framework made of titanium or acrylic resin between the bilateral first molars was modeled. Immediate loading and a delayed loading protocol were simulated. A vertical load of 200N was applied at the cantilever or on the abutments region of the distal implants, simulating the absence of a cantilever. RESULTS: The peak principal compressive strains in the immediate loading models resulted in 24.0-35.8% and 26.4-39.0% increases compared with the delayed loading models under non-cantilever loading and cantilever loading, respectively. The loading position greatly affected the principal compressive and tensile strain values. The peak principal compressive strains in non-cantilever loading resulted in a 45.3-52.6% reduction compared with those in cantilever loading. The framework material did not influence the peak compressive and tensile strain. The maximum micromotion at the bone-implant interface in the immediate loading models was 7.5-14.4μm. CONCLUSIONS: Mandibular fixed full-arch prostheses without cantilevers may result in a favorable reduction of the peri-implant bone strain during the healing period, compared with cantilevers. The maximum micromotion was within the acceptable limits for uneventful implant osseointegration in the immediate loading models. Framework material did not play an important role in reducing the peri-implant bone strain and micromotion at the bone-implant interface.
Description: 博士(医学)・乙第1398号・平成29年3月15日
Copyright © 2016 Japan Prosthodontic Society. Published by Elsevier Ltd. All rights reserved.
URI: http://hdl.handle.net/10564/3331
ISSN: 18831958
Academic Degrees and number: 24601B1398
Degree-granting date: 2017-03-15
Degree name: 博士(医学)
Degree-granting institutions: 奈良県立医科大学
Appears in Collections:2016年度

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