Spherical Ti-6Al-4V powders in the size range of 250 and 300 µm were uniformly doped with nano-sized hydroxyapatite (HAp) powders by Spex milling process. A single pulse of 0.75-2.0 kJ/0.7 g of the Ti-6Al-4V powders doped with HAp from 300 mF capacitor was applied to produce fully porous and porous-surfaced Ti-6Al-4V implant compact by electro-discharge-sintering (EDS). The solid core was automatically formed in the center of the compact after discharge and porous layer consisted of particles connected in three dimensions by necks. The solid core increased with an increase in input energy. The compressive yield strength was in a range of 41 to 215 MPa and significantly depended on input energy. X-ray photoelectron spectroscopy and energy dispersive x-ray spectrometer were used to investigate the surface characteristics of the Ti-6Al-4V compact. Ti and O were the main constituents, with smaller amount of Ca and P. It was thus concluded that the porous-surfaced Ti-6Al-4V implant compacts doped with HAp can be efficiently produced by manipulating the milling and electro-discharge-sintering processes.

Porous Ti implant samples were fabricated by the sintering of spherical Ti powders in a high vacuum furnace. To increase their surface area and biocompatibility, anodic oxidation and a hydrothermal treatment were then applied. Electrolytes in a mixture of glycerophosphate and calcium acetate were used for the anodizing treatment. The resulting oxide layer was found to have precipitated in the phase form of anatase TiO2 and nano-scaled hydroxyapatite on the porous Ti implant surface. The porous Ti implant can be modified via an anodic oxidation method and a hydrothermal treatment for the enhancement of the bioactivity, and current multi-surface treatments can be applied for use in a dental implant system.

본 연구의 결과 원예치료 프로그램을 통해 학교폭력 가․피해 학생들의 자아존중감이 향상됨을 확인하였다. 그러나 대상자의 수가 적고 연구 기간이 짧아 연구 결과를 일반화시키기에 제한점이 있으나, 향후 원예치료의 효과를 높이기 위해서는 청소년 개개인의 특성에 맞는 원예치료 프로그램을 개발할 필요가 있을 것이며, 또한 장기적인 원예프로그램뿐 아니라 학교와 연계된 가정에서의 원예프로그램을 지속적으로 실시한다면 건강한 청소년기를 보내는데 원예활동이 큰 역할을 할 것이라고 판단된다.(이민정 등, 2012)