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Cobalt-Chromium 합금의 표면처리가 4-META/MMA-TBB 레진과의 접착에 미치는 영향
진재식,김교한,이청희,조광헌,Jin, Jae-Sik,Kim, Kyo-Han,Lee, Cheong-Hee,Jo, Kwang-Hun 대한치과보철학회 2000 대한치과보철학회지 Vol.38 No.4
The effects of pretreatment of Co-Cr alloy, including two adhesive primers that contain either MDP or MAC-10, and silicoating on the bond The result sobtained as follows; o Strength of 4-META/MMA-TBB resin were investigated using FT-IR, SEM, and EDAX. o In the SEM observation of surface morphologies, the sandblasted specimen exibited a very rough surface, whereas the surfaces of the two groups primed with either MDP or MAC-10 were covered with a layer of primer, and the surface morphology of the silicoated specimen remained almost the same after sandblasting. o Before the thermocycling tests, the group treated with MDP demonstrated the highest mean tensile bond strength and the sandblasted group showed the lowest bond strength. o After 20,000 thermocyling, the mean tensile bond strength of the sandblasted group exhibited a 50% reduction in bond strength, while the others showed a $20\sim30%$ reduction. o Observation of the metal-resin interface revealed that in all groups the resin permeated the rough surface formed by sandblasting thereby producing a mechanical bond between the metal and the resin. It was also found that thermocycling resulted in a gap formation at the metal-resin interface of the specimens, and the sandblasted group exhibited a larger gap width than the other groups. o In fracture mode, all specimens indicated a cohesive fracture within the resin before thermocycling. However, thermocyling produced adhesive failure at the edge of the resin-metal interface in most specimens. The sandblasted group, which exhibited the lowest bond strength after thormocycling, also demonstrated the largest area of adhesive failure.
김한솔 ( Han Sol Kim ),김경택 ( Kyung Taek Kim ),조규섭 ( Gu Serb Cho ),강황진 ( Hwang Jin Kang ),김교한 ( Kyo Han Kim ),김원용 ( Won Yong Kim ) 대한금속재료학회 ( 구 대한금속학회 ) 2009 재료마당 Vol.22 No.2
생체재료용 Ti 합금에 관한 연구는 Ti-Nb계 합금의 저탄성계수와 초탄성·형상기억특성 향상에 초점을 두고 일본과 우리나라에서 활발히 진행되어 왔다. 이들의 연구결과를 종합해 보면, 저탄성계수와 초탄성·형상기억특성 향상은 모두 β상의 상안정성과 집합조직에 크게 영향을 받는다고 할 수 있다. 현재까지 Ti-Nb계 합금의 탄성계수가 상용의 Ti합금에 비해 월등히 낮은 값을 보이지만 아직까지 인체 뼈에 비해 높은 값을 가지고 있으며, 또한 초탄성·형상기억특성은 Nitinol합금에 비해 절반 정도에 불과하여, 앞으로도 탄성계수 저감과 초탄성·형상기억특성 향상에 대해 개발할 여지가 많이 남아있다. 이와 같은 기계적 특성과 함께 생체골의 동작 특성을 고려한 피로특성 또한 연구개발이 필수적으로 동반되어야 할 부분으로 많은 연구자들의 연구수행을 기대하여 본다. 마지막으로 연구개발 수행합금의 in-vitro 및 in-vivo 시험과 같은 생체적합성에 대한 연구 및 임상분야의 연구도 지속적으로 수행되어야 할 것이다.
다공성 3차원 Ti 지지체의 제조 및 알카리처리에 따른 생체활성 평가
안상현,김승언,김교한,윤희숙,현용택,An, Sang-Hyun,Kim, Seung-Eon,Kim, Kyo-Han,Yun, Hui-Suk,Hyun, Yong-Taek 한국재료학회 2009 한국재료학회지 Vol.19 No.7
Ti scaffolds with a three-dimensional porous structure were successfully fabricated using powder metallurgy and modified rapid prototyping (RP) process. The fabricated Ti scaffolds showed a highly porous structure with interconnected pores. The porosity and pore size of the scaffolds were in the range of 66$\sim$72% and $300\sim400\;\mu$m, respectively. The sintering of the fabricated scaffolds under the vacuum caused the Ti particles to bond to each other. The strength of the scaffolds depended on the layering patterns. The compressive strength of the scaffolds ranged from 15 MPa to 52 MPa according to the scaffolds' architecture. The alkali treatment of the fabricated scaffolds in an aqueous NaOH solution was shown to be effective in improving the bioactivity. The surface of the alkali-treated Ti scaffolds had a nano-sized fibre-like structure. The modified surface showed a good apatite forming ability. The apatite was formed on the surface of the alkali treated Ti scaffolds within 1 day. The thickness of the apatite increased when the soaking time in a simulated body fluid (SBF) solution increased. It is expected that the surface modification of Ti scaffolds by alkali treatment could be effective in forming apatites in vivo and can subsequently enhance bone formation.