Document Detail


Influence of number and inclination angle of implants on stress distribution in mandibular cortical bone with All-on-4 Concept.
MedLine Citation:
PMID:  20452854     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: The All-on-4 is used in the therapy of edentulous mandibles. However, few studies have investigated the effect of such implants on supporting bone. To clarify differences in stress in peri-implant cortical bone between 2-patterns of 6 implants and 8-patterns of 4 implants with change in inclination angle based on the All-on-4.
METHODS: Three-dimensional finite element analysis models based on the mean value of the Japanese edentulous mandible were constructed. Implants 13 or 15 mm in length were inserted between the mental foramina. In the 6-implant model, implants were inserted in parallel. In the 4-implant model, the 2 anterior implants were inserted in parallel and the 2 posterior implants in parallel or on a slant. Implants were splinted with a superstructure. A 50 N load was applied to the occlusal surface under condition A, at 2mm distal from the distal implant, or condition B, at the distal end of the superstructure. Maximum von Mises stress on cortical bone was measured.
RESULTS: Stress was concentrated around the posterior-most implant on the right side. Under condition A, stress increased with 4 implants and increase in angulation. At 45°, stress increased by 23% of that in the 6-implant model. Under condition B, stress increased with 4 implants, although stress decreased with increase in angulation. At 45°, stress decreased by 45% of that in the 6 implants.
CONCLUSIONS: The use of 4 implants or inclined implants increased stress on peri-implant cortical bone. However, when used in conjunction with a short cantilever, inclined implants decreased stress on peri-implant cortical bone.
Authors:
Takeshi Takahashi; Ichiro Shimamura; Kaoru Sakurai
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-05-10
Journal Detail:
Title:  Journal of prosthodontic research     Volume:  54     ISSN:  2212-4632     ISO Abbreviation:  J Prosthodont Res     Publication Date:  2010 Oct 
Date Detail:
Created Date:  2010-09-14     Completed Date:  2011-02-07     Revised Date:  2012-09-11    
Medline Journal Info:
Nlm Unique ID:  101490359     Medline TA:  J Prosthodont Res     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  179-84     Citation Subset:  D; IM    
Copyright Information:
Copyright © 2010. Published by Elsevier Ltd. All rights reserved.
Affiliation:
Department of Removable Prosthodontics and Gerodontology, Tokyo Dental College, 1-2-2 Masago, Mihama-ku, Chiba city, Chiba, 261-8502, Japan. takahashit@tdc.jp
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MeSH Terms
Descriptor/Qualifier:
Dental Implantation, Endosseous / methods*
Dental Implants
Dental Models
Dental Stress Analysis
Mandible*
Stress, Mechanical
Chemical
Reg. No./Substance:
0/Dental Implants

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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