Evaluation of the Polymerization Depth of Bulk Fill Resin Composites Polymerized by Different Procedures: An In-Vitro Study

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Özyurt E., Kurt A., YILDIRIM H.

Clinical and Experimental Health Sciences, vol.9, no.4, pp.304-309, 2019 (TRDizin)

Abstract

Objective: The aim of this study is to investigate the depth of cure (DOC) of the bulk fill composite samples prepared in different thicknesses withtwo different modes of light curing device with Vickers hardness tester.Methods: Five different bulk-fill composite materials were used in the present study. 20 sample of 2 mm and 20 sample of 4 mm thick sampleswere prepared, 10 samples from each group were polymerized for 20 seconds with the standard mode (Mode 1) of the light curing device and 10samples polymerized with soft-start mode (Mode 2) for 25 seconds (n=10). Hardness measurements were made from the upper and lower surfacesof each sample and the hardness ratio was calculated. The statistical analysis was performed using three-way analysis of variance (ANOVA) andTukey multiple comparisons (p = 0.05).Results: The hardness ratios of all composites were determined to be over 80%, which is clinically acceptable. There was a statistically significantdifference between the DOC levels according to the composites (p <0.05). There was a statistically significant difference according to the thickness(p <0.05). There was no statistically significant difference according to polymerization procedures (p >0.05).Conclusions: The surface hardness ratios of all groups were determined to be over 80%, which is clinically acceptable. The polymerization with softstart technique may not different from the standard-mode for polymerization depth.