Objectives: This study evaluated the effects of the resin thickness on the microhardness and optical properties of bulk-fill resin composites. Materials and Methods: Four bulk-fill (Venus Bulk Fill, Heraeus Kulzer; SDR, Dentsply Caulk; Tetric N-Ceram Bulk Fill, Ivoclar vivadent; SonicFill, Kerr) and...
Objectives: This study evaluated the effects of the resin thickness on the microhardness and optical properties of bulk-fill resin composites. Materials and 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 ${\alpha}=0.05$. 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.
Objectives: This study evaluated the effects of the resin thickness on the microhardness and optical properties of bulk-fill resin composites. Materials and 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 ${\alpha}=0.05$. 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.
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문제 정의
Also, there are few reports of the microhardness and optical properties according to resin thickness of these composites. Therefore, this study investigated the effects of the resin thickness on the microhardness and optical properties of bulk-fill resin composites.
대상 데이터
Four bulk-fill resin composites (Venus Bulk Fill, VB; SDR, SR; Tetric N-Ceram Bulk Fill, TB; SonicFill, SO) and two regular resin composites (Charisma flow, CF; Tetric N-Ceram, TN) were used. CF was used as the control group of flowable bulk-fill resin composites including VB and SR, whereas TN was used as the control group of the non-flowable bulk-fill resin composites including TB and SO.
Sixty acrylic cylindrical molds with a socket, 9 mm in diameter, were prepared for each thickness (2 mm, 3 mm and 4 mm). They were divided into six groups for each resin composite (n = 10).
데이터처리
*Student t-test.
The microhardness was analyzed by one-way and two-way ANOVA and Scheffe’s post hoc test, and the color differences were analyzed using a student t-test. TP was analyzed by one-way ANOVA. The software used was SPSS 15.
The microhardness was analyzed by one-way and two-way ANOVA and Scheffe’s post hoc test, and the color differences were analyzed using a student t-test.
성능/효과
For the restorations with bulk-fill resin composites, the manufacturers recommend that 4 mm thick increments can be cured in a single step. Based on the results of this study, up to 4 mm thick increments of bulk-fill resin composites are clinically acceptable.
05). Furthermore, the percentage of the bottom to top surface hardness (bottom/top hardness ratio) of the 4 mm specimens for VB, SR, CF, TB, SO, and TN were 94.2%, 87.3%, 60.4%, 78.7%, 84.8% and 52.4%, respectively. The bulk-fill resin composite groups including VB, SR, SO and TB showed a bottom/top hardness ratio of almost 80% or more in the 4 mm thick specimens.
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