| 학회 | 한국재료학회 |
| 학술대회 | 2004년 봄 (05/14 ~ 05/14, 강릉대학교) |
| 권호 | 10권 1호 |
| 발표분야 | 기타 |
| 제목 | 전기방전소결에 의한 다공성 치과용 임플란트의 제조 및 동물실험 연구 |
| 초록 | Since the surface features of dental implant have been changed from smooth to notched surfaces, the most implants have been designed to maintain immobility during healing so that osseointegration will occur. One of designs, porous-coated implants are intended to increase the surface area for the promotion of immobilization of the implant in bone by enabling mechanical interlocking between the implant and tissue, leading to faster osseointegration. Fabrication of porous-coated titanium based implants normally involves powder metallurgy operations to compact a metal powder in a die at room temperature and subsequently sinter it at elevated temperatures. The high temperatures involved in these processes, however, result in detrimental changes in the microstructure and mechanical properties. On the other hand, electro-discharge-sintering (EDS) combines simultaneous compaction and sintering of powders by applying a high voltage and high density current. We have first used this method to fabricate porous-coated Ti alloy implants. To provide a wide range of porosity of the implant that might affect the rate of osseointegration for various bone density, we have used four different powder sizes of 50-100 and 200-250 um and manipulated the various capacitances (150, 300, 450 uF) and input energies (0.75 - 2.0 kJ) for discharging. Finally, physical characteristics were evaluated in terms of degree of solid core formation, neck sizes, and porosity of the implants and correlated with discharging conditions. The basic physical properties of each implant, such as solid core size, pore size, and neck size on porous layer have been evaluated. The dependence of mechanical properties of each implant such as micro-hardness, yield stresses at different locations, and compressive strength have been also analyzed. The solid core and neck sizes between powders on porous layer generally increases with both input energy and capacitance. On the other hand, the pore size decreases with both input energy and capacitance. The micro-hardness analyses at various locations such as powders on porous layer, solid core, interface between solid core and powder, and interface between powder and powder show quitely constant values which is independent on the discharge conditions. The similar result has been also found in the case of yield stresses of each implant at different locations. The compressive strengths of each implant are in the rage of 39 and 452 MPa which depends on the input energy. Clinical examination using an adult dog showed that all the implants fabricated by current method were biocompatible and supports rapid and perfect osseointegration as short as 2 weeks. |
| 저자 | 이원희1, 안영배1, 천연욱1, 이권용1, 권종진2, 변창섭3, 현창용4, 김동관4 |
| 소속 | 1세종대, 2고려대, 3한밭대, 4서울산업대 |
| 키워드 | 임플란트; 다공성; 생체적합성; 골유착 |
