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International Journal of Dentistry
Volume 2011, Article ID 536212, 5 pages
http://dx.doi.org/10.1155/2011/536212
Research Article

Effect of Precuring Warming on Mechanical Properties of Restorative Composites

Department of Clinical Sciences, Faculty of Dentistry, University of Toronto, 124 Edward Street, Toronto, ON, Canada M5G 1G6

Received 14 July 2011; Accepted 4 October 2011

Academic Editor: Ali I. Abdalla

Copyright © 2011 Kareem Nada and Omar El-Mowafy. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

To investigate the effect of prepolymerization warming on composites' mechanical properties, three composites were evaluated: Clearfil Majesty (CM) (Kuraray), Z-100 (3M/ESPE), and Light-Core (LC) (Bisco). Specimens were prepared from each composite at room temperature as control and 2 higher temperatures ( and ) to test surface hardness (SH), compressive strength (CS), and diametral tensile strength (DTS). Data were statistically analyzed using ANOVA and Fisher's LSD tests. Results revealed that prewarming CM and Z100 specimens significantly improved their SH mean values ( ). Prewarming also improved mean CS values of Z100 specimens ( ). Furthermore, DTS mean value of CM prepared at was significantly higher than that of room temperature specimens ( ). KHN, CS, and DTS mean values varied significantly among the three composites. In conclusion, Prewarming significantly enhanced surface hardness of 2 composites. Prewarming also improved bulk properties of the composites; however, this improvement was significant in only some of the tested materials.