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Effect of acid-etching procedure on selected physical properties of mineral trioxide aggregate

Kayahan, M. B., Nekoofar, Mohammad Hossein, Kazandag, M., Canpolat, C., Malkondu, O., Kaptan, F. and Dummer, Paul Michael Howell ORCID: https://orcid.org/0000-0002-0726-7467 2009. Effect of acid-etching procedure on selected physical properties of mineral trioxide aggregate. International Endodontic Journal 42 (11) , pp. 1004-1014. 10.1111/j.1365-2591.2009.01610.x

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Abstract

P>Aim To evaluate the effect of acid-etch procedures on the compressive strength and surface microhardness of tooth-coloured mineral trioxide aggregate (MTA). Methodology White ProRoot MTA (Dentsply Tulsa Dental) was mixed and packed into cylindrical tubes of 4 mm in diameter and 6 mm in height. Three groups, each of 15 specimens were subjected to an acid-etch procedure either 4, 24 or 96 h after mixing. The compressive strength was measured and compared with unetched control groups. Differences between groups were analysed using the Kruskall-Wallis test. A further batch of cylindrical specimens of 6 mm in diameter and 12 mm in height were prepared for testing surface microhardness. Three groups of 15 specimens were subjected to the acid-etch procedure at either 4, 24 or 96 h following mixing. Data were subjected to one-way anova. Changes in the surface microstructure before and after the acid-etch procedures were analysed using a scanning electron microscope (SEM). Results There was a general trend for the compressive strength and surface microhardness of specimens to increase with time. In terms of compressive strength, the increase was significant between 4 h and the other time periods for both experimental and control groups (P < 0.0001); however, there was no significant difference between 24 and 96 h. The increase in surface microhardness was significant between 4, 24 and 96 h (P < 0.0001). In addition, there was a significant difference between experimental and control groups at all time periods (P < 0.0001). SEM examination revealed morphological differences between the intact and the etched MTA surfaces. Conclusions Acid-etch procedures affected the compressive strength and surface microhardness of ProRoot MTA. This indicates that it may be better to postpone restorative procedures for at least 96 h after mixing MTA. Etching created surface changes that might have the potential to enhance bonding of resinous materials.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Dentistry
Uncontrolled Keywords: acid etch; compressive strength; pH; SEM; Vickers surface micro hardness
Publisher: Wiley
ISSN: 0143-2885
Last Modified: 18 Oct 2022 13:55
URI: https://orca.cardiff.ac.uk/id/eprint/15911

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