Document Detail

Changes in mechanical properties of poly-l-lactic acid mini-plate under functional load simulating sagittal splitting ramus osteotomy.
MedLine Citation:
PMID:  18023560     Owner:  NLM     Status:  MEDLINE    
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.
H Mizuhashi; K Suga; T Uchiyama; Y Oda
Publication Detail:
Type:  Journal Article     Date:  2007-11-26
Journal Detail:
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:
Created Date:  2008-02-12     Completed Date:  2008-05-30     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8605826     Medline TA:  Int J Oral Maxillofac Surg     Country:  Denmark    
Other Details:
Languages:  eng     Pagination:  162-9     Citation Subset:  D; IM    
Department of Oral and Maxillofacial Surgery, Tokyo Dental College, 1-2-2 Masago, Miharma-ku, Chiba 261-8502, Japan.
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MeSH Terms
Biocompatible Materials / chemistry*
Bone Plates*
Calorimetry, Differential Scanning
Equipment Design
Equipment Failure
Lactic Acid / chemistry*
Mandible / surgery*
Materials Testing
Models, Anatomic
Molecular Weight
Osteotomy / instrumentation*,  methods
Polymers / chemistry*
Sodium Chloride / chemistry
Stress, Mechanical
Surface Properties
Time Factors
Transition Temperature
Reg. No./Substance:
0/Biocompatible Materials; 0/Buffers; 0/Polymers; 26100-51-6/poly(lactic acid); 50-21-5/Lactic Acid; 7647-14-5/Sodium Chloride

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