Dissolution behavior of hydroxyapatite coating by hydrothermal method: An in vitro study

Abstract

Hydroxyapatite (HA) coated CaO–SiO₂–B₂O₃–Na₂O glass composites prepared by a hydrothermal coating method were soaked in four kinds of solutions to evaluate the dissolution behavior and the chemical stability. 0.5 mol/l HCl and 0.5 mol/l HNO₃ were used as acidic solution, and 5% physiological saline and sodium lactate compound solution as the neutral physiological solution. It was found that HA coated glass composites had the better chemical stability and the corroding‐resistance ability. The dissolution behavior of the HA coating was mainly correlated with the phase composition of the as‐received HA coating and its microstructure as well as the pH value of the solution.