Abstract
Hydroxyapatite whisker (HW) was synthesised and used as a bioactive filler to reinforce dental resin composite. The effect of HW mass fraction on physical and mechanical properties of the composite was investigated by universal testing machine, microhardness tester and field emission scanning electron microscope (FE-SEM). HW had a superior reinforcing efficacy. Flexural modulus and Vickers microhardness of the resin composite were continuously improved with the increase of whisker fraction. Impregnation of 20 wt-% silanised HW into the resin dramatically improved flexural strength and compressive strength by 33·4 and 11·3% respectively. However, higher whisker fraction would not further enhance the strength of the composite, which might result from poor whisker dispersion. At higher filler loading, whisker tended to form agglomerations which were similar to the microstructure of enamel. It was revealed that HW could be a promising filler to fabricate bionic dental restoration with reliability.
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