Document Detail

Investigations in the correlation between Martens hardness and flexural strength of composite resin restorative materials.
MedLine Citation:
PMID:  20379029     Owner:  NLM     Status:  MEDLINE    
The purpose of this study is to verify the hypothesis that the hardness and flexural strength of composite resin restorative materials are correlated and similarly affected by accelerated aging. With four different composite resins (Tetric Evo Ceram, Synergy, Filtek Supreme, Quixfil), the effects of aging in distilled water at 37 degrees C or by thermal cycling (5 degrees C/55 degrees C) on Martens hardness and flexural strength were assessed. Flexural strength (n=12) was measured according to ISO 4049 immediately after light-curing and after 75 days of aging. Martens hardness (n=6) was measured in intervals up to 75 days. The results were statistically analyzed with one-way ANOVA, followed by a post hoc Bonferroni test. In all cases, the effect of aging on hardness could not be measured. The effect of aging on flexural strength was also not consistent, although it was found that thermal cycling affected flexural strength more than water storage. Martens hardness and flexural strength of composite resins are not correlated.
Jens Fischer; Svenja Roeske; Bogna Stawarczyk; Christoph H F H?mmerle
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Dental materials journal     Volume:  29     ISSN:  0287-4547     ISO Abbreviation:  Dent Mater J     Publication Date:  2010 Mar 
Date Detail:
Created Date:  2010-04-09     Completed Date:  2010-06-10     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8309299     Medline TA:  Dent Mater J     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  188-92     Citation Subset:  D    
Clinic for Fixed and Removable Prosthodontics and Dental Materials Science, Center for Dental and Oral Medicine, University of Zurich, Zurich, Switzerland.
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MeSH Terms
Composite Resins / chemistry*,  radiation effects
Dental Materials / chemistry*,  radiation effects
Dental Stress Analysis / instrumentation
Elastic Modulus
Materials Testing
Stress, Mechanical
Time Factors
Water / chemistry
Reg. No./Substance:
0/Composite Resins; 0/Dental Materials; 0/Filtek Supreme; 0/QuiXfil; 0/Synergy composite resin; 0/Tetric EvoCeram; 7732-18-5/Water

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

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