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Head & Face Medicine
Published in: Head & Face Medicine 1/2017

Open Access 01-12-2017 | Research

Assessing degradation of composite resin cements during artificial aging by Martens hardness

Authors: Stefan Bürgin, Nadja Rohr, Jens Fischer

Published in: Head & Face Medicine | Issue 1/2017

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Abstract

Background

Aim of the study was to verify the efficiency of Martens hardness measurements in detecting the degradation of composite resin cements during artificial aging.

Methods

Four cements were used: Variolink II (VL2), RelyX Unicem 2 Automix (RUN), PermaFlo DC (PDC), and DuoCem (DCM). Specimens for Martens hardness measurements were light-cured and stored in water at 37 °C for 1 day to allow complete polymerization (baseline). Subsequently the specimens were artificially aged by water storage at 37 °C or thermal cycling (n = 6). Hardness was measured at baseline as well as after 1, 4, 9 and 16 days of aging. Specimens for indirect tensile strength measurements were produced in a similar manner. Indirect tensile strength was measured at baseline and after 16 days of aging (n = 10). The results were statistically analyzed using one-way ANOVA (α = 0.05).

Results

After water storage for 16 days hardness was significantly reduced for VL2, RUN and DCM while hardness of PDC as well as indirect tensile strength of all cements were not significantly affected. Thermal cycling significantly reduced both, hardness and indirect tensile strength for all cements. No general correlation was found between Martens hardness and indirect tensile strength. However, when each material was analyzed separately, relative change of hardness and of indirect tensile strength revealed a strong linear correlation.

Conclusions

Martens hardness is a sensible test method to assess aging of resin composite cements during thermal cycling that is easy to perform.
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Metadata
Title
Assessing degradation of composite resin cements during artificial aging by Martens hardness
Authors
Stefan Bürgin
Nadja Rohr
Jens Fischer
Publication date
01-12-2017
Publisher
BioMed Central
Published in
Head & Face Medicine / Issue 1/2017
Electronic ISSN: 1746-160X
DOI
https://doi.org/10.1186/s13005-017-0142-4

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