Dental and Medical Problems

Dent Med Probl
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ISSN 1644-387X (print)
ISSN 2300-9020 (online)
Periodicity – quarterly

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Dental and Medical Problems

2020, vol. 57, nr 3, July-September, p. 247–253

doi: 10.17219/dmp/118123

Publication type: original article

Language: English

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Creative Commons BY-NC-ND 3.0 Open Access

Surface microhardness of a self-adhesive composite in comparison with conventional composite resins

Mikrotwardość powierzchni samoadhezyjnego materiału kompozytowego w porównaniu z klasycznymi żywicami kompozytowymi

Sedighe Sadat Hashemikamangar1,A,E,F, Mohammad Zeynaddini Meymand2,B,D, Mohammad Javad Kharazifard3,C, Sara Valizadeh1,A,E,F

1 Department of Operative Dentistry, School of Dentistry, Tehran University of Medical Sciences, Iran

2 Department of Periodontology, Dental School, Mashhad University of Medical Sciences, Iran

3 Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Iran

Abstract

Background. The surface microhardness of dental composites greatly affects the durability of restorations.
Objectives. The aim of this study was to compare the surface microhardness of a self-adhesive composite with that of other conventional composites. The effect aging has on surface microhardness was also evaluated.
Material and Methods. In this in vitro experimental study, the composite resins were poured into molds measuring 3 mm × 3 mm × 6 mm and cured for 40 s. The samples were then immersed in distilled water at 37°C for 24 h. After polishing, the surface microhardness of the samples was measured using the Vickers hardness tester. For this purpose, a 100-gram load was applied to 3 points on the surface of each composite sample for 20 s, and the mean value of surface microhardness was used as the Vickers hardness number. The samples were then subjected to 30,000 thermal cycles at 5–55°C in order to age them; after that, their surface microhardness was measured again. The one-way analysis of variance (ANOVA) was used for the statistical analysis.
Results. The maximum hardness value before and after aging belonged to Filtek® Z250, followed by Premise™ Flow and Vertise™ Flow, with significant differences between them (p < 0.001). After aging, the surface microhardness of all composites decreased significantly (p < 0.001). The effect of aging on surface microhardness was the same in all groups (p > 0.05).
Conclusion. The surface microhardness of composites was significantly different before and after aging. All composites experienced a reduction in their surface microhardness after aging.

Key words

aging, self-adhesive composite, surface microhardness

Słowa kluczowe

starzenie się, samoadhezyjny materiał kompozytowy, mikrotwardość powierzchni

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