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An Experimental Study on the Microhardness of 4 Kinds of Direct Composite Resins
Int J Clin Prev Dent 2017;13(4):183-188
Published online December 31, 2017;  https://doi.org/10.15236/ijcpd.2017.13.4.183
© 2017 International Journal of Clinical Preventive Dentistry.

Nam-Joong Kim

Department of Dental Technology and Science, Shinhan University, Uijeongbu, Korea
Correspondence to: Nam-Joong Kim
Department of Dental Technology and Science, Shinhan University, 95 Hoam-ro, Uijeongbu 11644, Korea. 
Tel: +82-31-870-3425, Fax: +82-31-870-3429, E-mail: wnj120@hanmail.net
Received December 9, 2017; Revised December 23, 2017; Accepted December 26, 2017.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Objective: The objective of this study is to compare the microhardness of various direct composite resins.Methods: The authors performed experiments on the microhardness of direct composite resins after polymerizing 4 kinds of direct composite resins on the medio-occluso-distal cavity (MOD) standard specimens.Results: The microhardness of Z350 was the highest (p<0.05). According to post-hoc study with Turkey honest significant difference by multiple comparison on microhardness test results, there were statistically significant differences between all kinds of direct composite resin. The microhardness of the direct composite resin past the expiration date was the lowest.Conclusion: Z350 scored the highest concerning the microhardness, and there was a statistically valid difference from the direct composite resin past its expiration date.
Keywords : composite resin, hardness
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