Dental Research Journal

ORIGINAL ARTICLE
Year
: 2021  |  Volume : 18  |  Issue : 1  |  Page : 96-

Effect of curing method and thermocycling on flexural strength and microhardness of a new composite resin with alkaline filler


Mahmoud Bahari, Mehdi Abed Kahnamoui, Mohammad Esmaeel Ebrahimi Chaharom, Soodabeh Kimyai, Zeinab Sattari 
 Dental and Periodontal Research Center; Department of Operative Dentistry, Dental Faculty, Tabriz Medical Sciences University, Tabriz, Iran

Correspondence Address:
Dr. Mohammad Esmaeel Ebrahimi Chaharom
Department of Operative Dentistry, Dental Faculty, Tabriz Medical Sciences University, Daneshgah Ave, Tabriz
Iran

Background: Cention N has been introduced as an alternative material for amalgam. The purpose was to investigate the flexural strength and microhardness of this material in self-cure and dual-cure modes before and after thermocycling. Materials and Methods: In this experimental study, 40 samples of Cention N were prepared in order to determine and compare the microhardness. Half of the samples were set by self-cure method and the other half with dual-cure method. The Vickers microhardness test was performed once after 24 h and again after 10000 thermocyclings. Three-point flexural test was used to determine and compare the flexural strength of 52 rod-shaped samples. Half of the samples were set by self-cure method and the other half with dual-cure method. Among 26 samples in each group, 13 samples were randomly selected and three-point flexural test was performed after 24 h and for another 13 samples after 10,000 thermocyclings. Data were analyzed using two-way ANOVA and paired samples t-test (P < 0.05). Results: There was a statistically significant difference between the mean of microhardness values in two curing methods (P < 0.001) and in two storage conditions (P < 0.001). The mean of dual-cure microhardness (100.99 ± 7.22) was higher than that of self-cure (64.61 ± 12.51) and the mean value associated with pre-thermocycling (89.75 ± 15.84) was higher than that of the post-thermocycling (76.44 ± 23.56). There was no statistically significant difference between the mean flexural strength in the two curing methods (self-cure [72.85 ± 16.26], dual cure [79.87 ± 23.07]; [P > 0.05]). However, the mean flexural strength without thermocycling (85.98 ± 21.74) was higher than that of the thermocycled group (64.24 ± 6.40) (P < 0.001). Conclusion: The microhardness of Cention N in dual-cure mode was higher than that of self-cure mode, but the flexural strength of dual-cure was not significantly different from that of self-cure. Thermocycling had a significant effect on the microhardness and flexural strength.


How to cite this article:
Bahari M, Kahnamoui MA, Chaharom ME, Kimyai S, Sattari Z. Effect of curing method and thermocycling on flexural strength and microhardness of a new composite resin with alkaline filler.Dent Res J 2021;18:96-96


How to cite this URL:
Bahari M, Kahnamoui MA, Chaharom ME, Kimyai S, Sattari Z. Effect of curing method and thermocycling on flexural strength and microhardness of a new composite resin with alkaline filler. Dent Res J [serial online] 2021 [cited 2021 Nov 30 ];18:96-96
Available from: https://www.drjjournal.net/article.asp?issn=1735-3327;year=2021;volume=18;issue=1;spage=96;epage=96;aulast=Bahari;type=0