Document Detail

Creep and dynamic viscoelastic behavior of endodontic fiber-reinforced composite posts.
MedLine Citation:
PMID:  19699701     Owner:  NLM     Status:  MEDLINE    
PURPOSE: Fiber-reinforced composite (FRC) posts have gained much interest recently and understanding of their viscoelastic properties is important as they can be used in stress-bearing posterior restorations. The aim of this study was to evaluate the creep behavior and the viscoelastic properties of four commercial FRC posts under different temperatures and different storage conditions.
METHODS: The FRC posts tested were Glassix, C-Post, Carbonite and Snowlight. For the creep measurements a constant load below the proportional limit of the posts was applied and the angular deformation of the specimens was recorded. The viscoelastic parameters were determined by using dynamic torsional loading under four different conditions.
RESULTS: All materials were susceptible to creep and exhibited linear viscoelastic behavior. Residual strain was observed in all FRC posts. The viscoelastic properties were affected by the increase of temperature and water storage (p<0.001) resulting in their decline. Carbon fiber posts exhibited better performance than glass fiber posts.
CONCLUSIONS: FRC posts exhibit permanent strains under regular masticatory stresses that can be generated in the oral cavity. Their properties are susceptible to changes in temperature, while direct contact with water also affects them deleteriously.
D Papadogiannis; R S Lakes; G Palaghias; Y Papadogiannis
Publication Detail:
Type:  Journal Article     Date:  2009-08-21
Journal Detail:
Title:  Journal of prosthodontic research     Volume:  53     ISSN:  2212-4632     ISO Abbreviation:  J Prosthodont Res     Publication Date:  2009 Oct 
Date Detail:
Created Date:  2009-09-07     Completed Date:  2009-12-08     Revised Date:  2012-09-11    
Medline Journal Info:
Nlm Unique ID:  101490359     Medline TA:  J Prosthodont Res     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  185-92     Citation Subset:  D; IM    
Department of Biomaterials, School of Dentistry, University of Athens, Greece.
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MeSH Terms
Composite Resins*
Post and Core Technique*
Stress, Mechanical
Reg. No./Substance:
0/Composite Resins; 7732-18-5/Water

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