Original article
Polymerization behavior of bulk-fill and hybrid-type resin composites using different light curing mode
2023 年 23 巻 1 号 p. 1-4
詳細
2023 年 23 巻 1 号 p. 1-4
Purpose: This study aimed to investigate if the hardness ratio of the bulk-fill-type resin composite is higher than that of the hybrid-type resin composite, to determine when the radiant exposure was the same, and to investigate if the polymerization of resin composites at the top and bottom surfaces and the hardness ratio is affected by differences in irradiance light sources. Methods: The light-curing unit used was the LED G-Light Prima-II Plus (blue + violet LED) light-curing unit. The light-cured resin composites were hybrid-type Clearfil AP-X and bulk-fill flowable-type Gracefil BulkFlo. Composite specimens with 2-mm-thick were polymerized in Teflon molds using radiant exposure of 24 J/cm2. The light-curing methods were 1,100 mW/cm2 for 22 s and 600 mW/cm2 for 40 s. Just after light-curing, the Knoop hardness was measured at the top and bottom surfaces of each specimen using a hardness tester, and the hardness ratio was calculated. Results: The bulk-fill flowable type resin composite, Gracefil BulkFlo, showed a lower hardness ratio than the hybrid-type resin composite, Clearfil AP-X. When radiant exposure was the same, 600 mW/cm2 irradiance light created more uniform polymerization of the resin composite than 1,100 mW/cm2 irradiance light for both bulk-fill and hybrid-type resin composites.Conclusion: It was suggested that curing with an irradiance of 600 mW/cm2 for 40 s created more uniform polymerization for both materials.
