| 초록 |
In order to improve the bone in-growth properties and implant fixation behavior, hydroxyapatite (HA) is commonly applied to Ti implants as a coating material. The direct bone bonding capacity of HA is known as osteoconductivity, which means that HA allows direct formation of bone on its bioactive surface by acting as a template. There are several methods for coating Ti with HA, such as plasma spraying or sputter-deposition. However, coating properties in terms of coating chemistry and morphology can be varied only to a limited extent. On the other hand, an electrostatic-spray-deposition (ESD) method is relatively simple and inexpensive process for the coating inorganic thin films with a variety of chemical and morphological properties. It is seen that a solid core is automatically formed by the discharge in the center of the compact which is surrounded by a microporous layer. The solid core was composed of powder particles which were deformed and welded together. Figures 1 show SEM images of EDS Ti compact coated with HA by ESD under current experimental condition. HA particles were quite uniformly distributed through out the porous-surfaced structure of Ti compact. HA-coated Ti compacts were further heat-treated at 700 °C for 2 hours in a high vacuum. The heat-treated HA coating was also observed to consist of relatively equiaxed grains with sizes of about 100–300 nm in diameter. Any pores or cracks have not been found on the surface. |
