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Investigations in the correlation between Martens hardness and flexural strength of composite resin restorative materials


Fischer, J; Roeske, S; Stawarczyk, B; Hämmerle, C H F (2010). Investigations in the correlation between Martens hardness and flexural strength of composite resin restorative materials. Dental Materials Journal, 29(2):188-192.

Abstract

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.

Abstract

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.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Center for Dental Medicine > Clinic for Fixed and Removable Prosthodontics
Dewey Decimal Classification:610 Medicine & health
Language:English
Date:March 2010
Deposited On:05 May 2010 13:27
Last Modified:05 Apr 2016 14:07
Publisher:The Japanese Society for Dental Materials and Devices
ISSN:0287-4547
Free access at:Official URL. An embargo period may apply.
Publisher DOI:https://doi.org/10.4012/dmj.2009-080
Related URLs:https://www.zora.uzh.ch/19602/
PubMed ID:20379029

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