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Comparison of Mechanical Properties between Bulk-fill and Conventional Composite Resin

석유정 1,  Kim Jongbin ORD ID 2,  김기섭 1,  Jong-Soo Kim ORD ID 2

1단국대학교 치과대학 소아치과학교실
2단국대학교

Accredited

ABSTRACT

The aim of this study was to compare the mechanical properties of high viscosity bulk-fill resin composites, FiltekTM Bulk Fill Posterior Restorative (FBF) and Tetric􀋓 N-Ceram Bulk Fill (TBF), with conventional composite (FiltekTM Z-350 XT, Z-350). The Vickers hardness test which indicates the degree of conversion was performed and the dye penetration test was performed to measure the microleakage which indicates polymerization shrinkage amount. To minimize experimental error, the standardized 3D-printed molds and the bovine teeth were used. Obtained data were analyzed by the Kruskal-Wallis test and Mann-Whitney test with the confidence interval of 95%. In the microhardness test within 1 hour of polymerization, lower surface of FBF and TBF showed significantly lower value than that of Z-350 (p < 0.05). But after 24 hours, the microhardness of FBF had increased and showed no significant difference with Z-350 (p > 0.05). In top and 2 mm depth surface, mean microhardness values were in the following order: Z-350 > FBF > TBF (p < 0.05). The mean microleakage value of TBF was significantly lower than others (p < 0.05). For clinical application of bulk-fill resin composites, caution for applying masticatory forces during 24 hours after polymerization is advised and further studies to decrease microleakage should be conducted.

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