| Changes in mechanical properties of poly-l-lactic acid mini-plate under functional load simulating sagittal splitting ramus osteotomy. | |
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MedLine Citation:
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PMID: 18023560 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The purpose of this study was to investigate how the characteristics of a poly-l-lactic acid mini-plate changed with dynamic loading in an environment with hydrolytic degradation. A mandible osteosynthesis model was prepared with specimen poly-l-lactic acid mini-plates to simulate sagittal splitting ramus osteotomy. The model was then subjected to dynamic loading, and changes in specimen shape and surface quality were observed. Specimen bending strength was then measured, and degree of hydrolytic degradation estimated. Neither dynamic loading nor degree of load clearly affected degree of hydrolytic degradation. The specimens maintained their original shape and bending strength for up to 4 weeks with dynamic loading of 40 N or less in an environment with hydrolytic degradation. At 8 weeks, under the same conditions, the specimens showed cracks or fractures, or both, together with a clear decrease in bending strength. The results suggest that dynamic loading causes cracking in a poly-l-lactic acid mini-plate, and that growth of these cracks decreases bending strength over time, leading to fatigue fracture. |
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Authors:
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H Mizuhashi; K Suga; T Uchiyama; Y Oda |
Publication Detail:
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Type: Journal Article Date: 2007-11-26 |
Journal Detail:
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Title: International journal of oral and maxillofacial surgery Volume: 37 ISSN: 0901-5027 ISO Abbreviation: Int J Oral Maxillofac Surg Publication Date: 2008 Feb |
Date Detail:
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Created Date: 2008-02-12 Completed Date: 2008-05-30 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8605826 Medline TA: Int J Oral Maxillofac Surg Country: Denmark |
Other Details:
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Languages: eng Pagination: 162-9 Citation Subset: D; IM |
Affiliation:
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Department of Oral and Maxillofacial Surgery, Tokyo Dental College, 1-2-2 Masago, Miharma-ku, Chiba 261-8502, Japan. mizuhasi@tdc.ac.jp |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Biocompatible Materials
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chemistry* Bone Plates* Buffers Calorimetry, Differential Scanning Crystallization Equipment Design Equipment Failure Humans Hydrolysis Lactic Acid / chemistry* Mandible / surgery* Materials Testing Models, Anatomic Molecular Weight Osteotomy / instrumentation*, methods Pliability Polymers / chemistry* Sodium Chloride / chemistry Stress, Mechanical Surface Properties Time Factors Transition Temperature Viscosity |
| Chemical | |
Reg. No./Substance:
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0/Biocompatible Materials; 0/Buffers; 0/Polymers; 26100-51-6/poly(lactic acid); 50-21-5/Lactic Acid; 7647-14-5/Sodium Chloride |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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