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Influence of nanometer scale particulate fillers on some properties of microfilled composite resin

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Abstract

The aim of this study was to evaluate the effect of different weight fractions of nanometer sized particulate filler on properties of microfilled composite resin. Composite resin was prepared by mixing 33 wt% of resin matrix to the 67 wt% of silane treated microfine silica particulate fillers with various fractions of nanometer sized fillers (0, 10, 15, 20, 30 wt%) using a high speed mixing machine. Test specimens made of the composites were tested with a three-point bending test with a speed of 1.0 mm/min until fracture. Surface microhardess (Vicker’s microhardness) was also determined. The volumetric shrinkage in percent was calculated as a buoyancy change in distilled water by means of the Archimedes principle. The degree of monomer conversion (DC%) of the experimental composites containing different nanofiller fractions was measured using FTIR spectroscopy. Surface roughness (Ra) was determined using a surface profilometer. Nanowear measurements were carried out using a nanoindentation device. The water uptake of specimens was also measured. Parameters were statistically analysed by ANOVA (P < 0.05). The group without nanofillers showed the highest flexural strength and modulus, DC% and Ra value. The group with 30% nanofillers had the highest water uptake and volumetric shrinkage. No significant difference was found in Vicker’s microhardness and the nanowear of the composites. The plain microfilled composite demonstrated superior properties compared to the composites loaded with nanofillers with the exception of surface roughness.

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Authors and Affiliations

  1. Department of Biomaterials Science, Institute of Dentistry and BioCity Turku Biomaterials Research Program, University of Turku, Turku, Finland

    Sufyan Garoushi, Lippo V. J. Lassila & Pekka K. Vallittu

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  1. Sufyan Garoushi
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  2. Lippo V. J. Lassila
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  3. Pekka K. Vallittu
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Correspondence to Sufyan Garoushi.

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Garoushi, S., Lassila, L.V.J. & Vallittu, P.K. Influence of nanometer scale particulate fillers on some properties of microfilled composite resin. J Mater Sci: Mater Med 22, 1645–1651 (2011). https://doi.org/10.1007/s10856-011-4352-1

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  • DOI: https://doi.org/10.1007/s10856-011-4352-1

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