Effect of resin thickness on the microhardness and optical properties of bulk-fill resin composites
김은하, 정경화, 손성애, Hur Bock, 권용훈, 박정길,
소속 상세정보
김은하 ( Kim Eun-Ha ) - Pusan National University School of Dentistry Department of Conservative Dentistry
정경화 ( Jung Kyoung-Hwa ) - Pusan National University School of Dentistry Department of Conservative Dentistry
손성애 ( Son Sung-Ae ) - Pusan National University School of Dentistry Department of Conservative Dentistry
( Hur Bock ) - Pusan National University School of Dentistry Department of Conservative Dentistry
권용훈 ( Kwon Yong-Hoon ) - Pusan National University School of Dentistry Department of Dental Materials
박정길 ( Park Jeong-Kil ) - Pusan National University School of Dentistry Department of Conservative Dentistry
KMID : 1034420150400020128
Abstract
Objectives: This study evaluated the effects of the resin thickness on the microhardness and optical properties of bulk-fill resin composites.
Methods: Four bulk-fill (Venus Bulk Fill, Heraeus Kulzer; SDR, Dentsply Caulk; Tetric N-Ceram Bulk Fill, Ivoclar vivadent; SonicFill, Kerr) and two regular resin composites (Charisma flow, Heraeus Kulzer; Tetric N-Ceram, Ivoclar vivadent) were used. Sixty acrylic cylindrical molds were prepared for each thickness (2, 3 and 4 mm). The molds were divided into six groups for resin composites. The microhardness was measured on the top and bottom surfaces, and the colors were measured using Commission Internationale d'Eclairage (CIE) L*a*b* system. Color differences according to the thickness and translucency parameters and the correlations between the microhardness and translucency parameter were analyzed. The microhardness and color differences were analyzed by ANOVA and Scheffe's post hoc test, and a student t-test, respectively. The level of significance was set to α = 0.05.
Results: The microhardness decreased with increasing resin thickness. The bulk-fill resin composites showed a bottom/top hardness ratio of almost 80% or more in 4 mm thick specimens. The highest translucency parameter was observed in Venus Bulk Fill. All resin composites used in this study except for Venus Bulk Fill showed linear correlations between the microhardness and translucency parameter according to the thickness.
Conclusions: Within the limitations of this study, the bulk-fill resin composites used in this study can be placed and cured properly in the 4 mm bulk.
키워드
Bulk-fill resin composite; Microhardness; Thickness; Translucency parameter
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