Synthesis of Fluorinated Urchin-like Serried Hydroxyapatite with Improved Water Sorption-Solubility and Bioactivity for Dental Composites |
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Authors: | CHEN Hongyan WANG Junjun WANG Ruili ZHU Meifang |
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Affiliation: | State Key Laboratory for Modification of Chemical Fibers and Polymer Mate-rials,International Joint Laboratory for Advanced Fiber and Low-dimension Materials,College of Materials Science and Engineering,Donghua University,Shanghai 201620,P.R.China |
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Abstract: | Fluorine is present in the hydroxyapatite mineral in natural tooth enamel, which plays a key role in the prevention of dental caries. The aim of this study is to synthetize the fluorinated urchin-like serried hydroxyapatite(FnUHA) particles with different degrees of fluorine substitution and explore the effect of the fluorine element on the water absorption-solubility, mechanical strength, and biological activity of dental composites. The obtained FnUHA particles were further modified with 3-methacryloxypropyl trimethoxysilane(γ-MPS) to get the silanized FnUHA(SFnUHA) particles, which were then used as the reinforcement for dental composites. The morphology, compositional elements, and structure of the FnUHA were characterized by field-emission scanning electron microscopy(FE-SEM), transmission electron microscopy(TEM), X-ray photoelectron spectroscopy(XPS), X-ray diffractometer(XRD), and Fourier transform infrared spectrometer (FTIR), respectively. The mechanical properties of the SFnUHA reinforced composites with different filler loadings were measured with a universal testing machine. The results demonstrated that the 50%(mass fraction) SF5UHA filled composite exhibited the acceptable flexural strength and compressive strength, giving the respective improvements of 56.3% and 30.8% compared with those of the 50% SUHA filled composite. In addition, this composite also presented lower water absorption-solubility, better in vitro bioactivity, and excellent cell viability. Therefore, fluorinated hydroxyapatite is a promising filler to improve the mechanical properties and functionality of dental composites. |
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Keywords: | Fluorinated hydroxyapatite Dental composite Mecha-nical property Water absorption In vitro bioactivity Cell viability |
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