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Surface microhardness measurements

NT Nuray Tuloglu
SB Sule Bayrak
ET Emine Sen Tunc
FO Fusun Ozer
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Enamel surface microhardness was measured before treatment (baseline) and after pH cycling using a Vickers microhardness tester (HM112, Mitutoyo Corporation, Tokyo, Japan) with a load of 100 g. Three indentations at distances of 100 μm from each other, were performed in the center of enamel specimens, the average was calculated and recorded as the Vickers microhardness number (VHN) for each specimen. Baseline (VHN1) and post-pH cycling (VHN2) Vickers microhardness numbers were used to calculate the percentage of loss surface microhardness (%VHN) following acid exposure using the formula: 100× (VHN2-VHN1) ⁄ VHN1 [20].

Copyright and License information: The Author(s). ©2016
Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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