The aim of this research was to develop an intrarradicular dental post based on epoxy resin/nano zirconium phosphate composite with potential appli-cation in prosthetic dentistry. Zirconium phosphate (ZrP) nanoparticle was synthesized by a reaction between phosphoric acid (H3PO4) and zirconium (IV) oxide chloride 8-hydrate (ZrOCl2·8H2O) and applied as filler. Commer-cial epoxy resin and hardener were used as polymer matrix. The composites were prepared at different proportions of epoxy resin/hardener, filler amount, reaction time and temperature. Infrared revealed that degree of conversion decreased with amount of ZrP. Insoluble matter was upper than 97%. Thermogravimetry indicated two steps of degradation. The best values of flexural modulus and flexural strength were achieved for the post desig-nated as 1:0.25:0.25. Laser scanning confocal microscopy suggested that the morphology of the posts fractured surface varied according to epoxy-resin:hardener ratio and the ZrP amount. From atomic force micros-copy, the topographic view exposed the shape and size of ZrP particles. Field emission scanning electron microscopy and energy dispersive spectroscopy indicated good adhesion between epoxy resin matrix-ZrP and that the pres-ence of phosphate rendered brittle the fracture surface.
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