The Synthesis of Urchin‐Like Serried Hydroxyapatite (USHA) and its Reinforcing Effect for Dental Resin Composites

摘要

Abstract The novel urchin‐like serried hydroxyapatite (USHA) is synthesized by homogeneous hydrothermal precipitation method through adjusting the pH value and temperature. The silanized USHA is thereby used as the reinforcing filler for dental resin composites. The structure and morphology of various HA nanostructures are characterized with X‐ray diffraction, Fourier transform infrared spectroscopy, and field‐emission scanning electron microscope. Thermogravimetric analysis is used to analyze the grafting ratio of 3‐methacryloxypropyl trimethoxysilane on the surface of USHA. Mechanical performance of dental resin composites reinforced with silanized USHA at different filler loadings are measured by a universal mechanical testing machine. The neat resin matrix is served as the control group. Results demonstrate that the optimization of USHA morphology gave a better understanding of the effect of the pH value and temperature on its structure transformation. After trials, USHA with the complete globular structure and the serried whiskers is synthesized at pH value of 12.5 under 105?°C. When the USHA loading is 30 wt%, the corresponding dental composite significantly improved the mechanical properties in comparison with the neat resin, especially for the compressive strength.