KMID : 1034420210460030039
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Restorative Dentistry & Endodontics 2021 Volume.46 No. 3 p.39 ~ p.39
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Physicochemical characterization of two bulk fill composites at different depths
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Grazioli Guillermo
Cuevas-Suarez Carlos Enrique Nakanishi Leina Francia Alejandro de Moraes Rafael Ratto
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Abstract
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Objectives: This study analyzed the physical-chemical behavior of 2 bulk fill resin composites (BFCs; Filtek Bulk Fill [FBF], and Tetric-N-Ceram Bulk Fill [TBF]) used in 2- and 4-mm increments and compared them with a conventional resin composite (Filtek Z250).
Materials and Methods: Flexural strength and elastic modulus were evaluated by using a 3-point bending test. Knoop hardness was measured at depth areas 0?1, 1?2, 2?3, and 3?4 mm. The translucency parameter was measured using an optical spectrophotometer. Real-time polymerization kinetics was analyzed using Fourier transform infrared spectroscopy.
Results: Flexural strength was similar among the materials, while TBF showed lower elastic modulus (Z250: 6.6 ¡¾ 1.3, FBF: 6.4 ¡¾ 0.9, TBF: 4.3 ¡¾ 1.3). The hardness of Z250 was similar only between 0?1 mm and 1?2 mm. Both BFCs had similar hardness until 2?3 mm, and showed significant decreases at 3?4 mm (FBF: 33.45 ¡¾ 1.95 at 0?1 mm to 23.19 ¡¾ 4.32 at 3?4 mm, TBF: 23.17 ¡¾ 2.51 at 0?1 mm to 15.11 ¡¾ 1.94 at 3?4 mm). The BFCs showed higher translucency than Z250. The polymerization kinetics of all the materials were similar at 2-mm increments. At 4-mm, only TBF had a similar degree of conversion compared with 2 mm.
Conclusions: The BFCs tested had similar performance compared to the conventional composite when used in up to 2-mm increments. When the increment was thicker, the BFCs were properly polymerized only up to 3 mm.
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KEYWORD
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Resin composite, Flexural strength, Hardness, Polymerization
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