An Experimental Study of Ultrathin Hydroxyapatite Coated Implant

―Biomechanical Investigation―

Abstract

In this study, we performed a pull-out strength test using an ultrathin HA coated implant by the thermal decomposition method (HA type) and pure titanium implant (Ti type).
Prior to the experiment, surface quality was analyzed using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) for the HA type.
Each screw was embedded in the rabbit femur and pull-out strength was examined using a load cell type omnipotent testing device.
1. The surface of the HA type was observed by SEM and EDS, and the HA layer coated on the Ti surface was detected by SEM. Moreover, a coating layer of calcium was observed on the surface by EDS and the thickness was found to be 2-5μm.
2. In the pull-out strength test, at 2, 4, 8 and 12 weeks, the strength of the HA type was 1.38, 1.33, 1.27 and 1.14 times that of the Ti type, suggesting that bone joint power is developed at an early stage.
Therefore, even if an HA coated implant by the thermal decomposition method is ultrathin, its bone conduction ability is good. Hence, this biomechanical material is useful for biological combinations.