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. 2017 Mar 1;9(3):e424-e430.
doi: 10.4317/jced.53463. eCollection 2017 Mar.

Flexural strength and microhardness of anterior composites after accelerated aging

Kanşad Pala  1 , Neslihan Tekçe  2 , Safa Tuncer  3 , Mustafa Demirci  4 , Fatih Öznurhan  5 , Merve Serim  6
Affiliations

Flexural strength and microhardness of anterior composites after accelerated aging

Kanşad Pala et al. J Clin Exp Dent. .

Abstract

Background: This study aimed to evaluate the flexural strength and microhardness of three different anterior composites after 10 000 thermocycles.

Material and methods: The mechanical properties of a nano-fill composite (Filtek Ultimate Universal Restorative (FUR) (Enamel)), a nano-hybrid composite (Clearfil Majesty ES2 (ES2) (Enamel)), and a micro-hybrid composite (G Aenial Anterior (GAA)) were investigated in this study. For the microhardness test, 8-mm diameter and 2-mm thickness composite discs were used (n = 10), and for the flexural strength test, 25x2x2 mm bar-shaped specimens were prepared (n = 13). The specimens were tested at 24 h and after 10 000 thermocycles. Data were analyzed using two-way analysis of variance and the post-hoc Tukey test (p < .05). Correlations between hardness and flexural strength were calculated using Pearson's correlation analysis.

Results: There was a significant difference in the microhardness values of the materials (p < .05). FUR exhibited significantly higher microhardness than ES2 and GAA. However, the flexural strength of three composites was statistically similar at 24 h (p > .05). Pearson correlation analysis revealed that there was a negative relationship between the mean hardness and flexural strength values (correlation coefficient = -0.367, p = .043). After 10 000 thermocycles, microhardness values of each material and flexural strength of ES2 and GAA decreased significantly according to 24 h.

Conclusions: The nano-fill composite FUR displayed significantly higher microhardness values. However, each resin composite was statistically similar for flexural strength values. Ten thousand thermocycles significantly affected microhardness and flexural strength. Key words:Flexural strength, microhardness, anterior composites.

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Conflict of interest statement

Conflict of interest statement:The authors have declared that no conflict of interest exist.

Figures

Figure 1
Figure 1
SEM image of fractured specimen of FUR; a: ×70 magnification; b: ×5 00 magnification.
Figure 2
Figure 2
SEM image of fractured specimen of ES2; a: ×70 magnification; b: ×5 00 magnification.
Figure 3
Figure 3
SEM image of fractured specimen of GAA; a: ×70 magnification; b: ×5 00 magnification.
See this image and copyright information in PMC

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