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Mechanical Response of Dental Cements as Determined by Nanoindentation and Scanning Electron Microscopy

Published online by Cambridge University Press:  26 September 2013

Mohammad Ali Saghiri ,
Amir Nazari ,
Franklin Garcia-Godoy ,
Armen Asatourian ,
Mansour Malekzadeh  and
Maryam Elyasi
Mohammad Ali Saghiri*
Affiliation:
Department of Dental Material, Center for Craniofacial Research, Azad University (Tehran Branch), Tehran, Iran
Amir Nazari
Affiliation:
Department of Restorative Sciences, Tokyo Medical and Dental University, Tokyo, Japan
Franklin Garcia-Godoy
Affiliation:
College of Dentistry, University of Tennessee, Memphis, TN, USA
Armen Asatourian
Affiliation:
Kamal Asgar Research Center, Tehran, Iran
Mansour Malekzadeh
Affiliation:
Department of Dental Material, Center for Craniofacial Research, Islamic Azad University (Tehran Branch), Tehran, Iran
Maryam Elyasi
Affiliation:
Tehran, Iran
*
*Corresponding author. E-mail: saghiri@gmail.com
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Abstract

This study evaluated the effects of nanoindentation on the surface of white mineral trioxide aggregate (WMTA), Bioaggregate and Nano WMTA cements. Cements were mixed according to the manufacturer directions, condensed inside glass tubes, and randomly divided into three groups (n = 8). Specimens were soaked in synthetic tissue fluid (pH = 7.4) and incubated for 3 days. Cement pellets were subjected to nanoindentation tests and observed by scanning electron microscopy. Then, the images were processed and the number of cracks and total surface area of defects on the surface were calculated and analyzed using ImageJ. Data were submitted to one-way analysis of variance and a post hoc Tukey's test. The lowest number of cracks and total surface of defects were detected in Nano WMTA samples; however, it was not significantly different from WMTA samples (p = 0.588), while the highest values were noticed in Bioaggregate specimens that were significantly different from Nano WMTA and WMTA (p = 0.0001). The surface of WMTA and Nano WMTA showed more resistance after exposure to nano-compressive forces which indicated a better surface tolerance against these forces and crack formation. This suggests these substances are more tolerant cement materials which can predictably withstand loaded situations in a clinical scenario.

Keywords

dental cementsWMTANano WMTAnanoindentation
Type
Biomedical and Biological Applications
Information
Microscopy and Microanalysis , Volume 19 , Issue 6 , December 2013 , pp. 1458 - 1464
Copyright
Copyright © Microscopy Society of America 2013 

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