objective: to approach the change of stress shielding rate of internal fixation materials made of nano zirconia gradient compounded with hydroxyapatite.
目的:探讨氧化锆梯度复合羟基磷灰石内固定材料的应力遮挡率的变化。
the results show that the zirconium atom exist as tetramer in sol and the nano zirconia is the product of deprotonation and polymerization of the tetramer.