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Kokubo, Tadashi,Uenoyama, Mayo,Kim, Hyun-Min,Minoda, Masahiko,Miyamoto, Takeaki,Nakamura, Takashi The Korean Ceramic Society 1999 The Korean journal of ceramics Vol.5 No.3
Polyethylene was modified with silanol groups on its surface by photografting of vinyltrimethoxysilane in vapor phase by using benzophenon as a polymerization initiator and by hydrolyzing the methoxysilane groups into the silanol groups with HCI solution. The modified polyethylene formed a dense and homogeneous apatite layer on its surface in a solution with ion concentrations 1.5 times those of human blood plasma within 21 days. This kind of biomimetic process could provide techniques for fabricating apatite-polymer composites with three dimensional structure analogous to the natural bone.
(Bi₂O₃)·(Nb₂O)-6Bi₂O₃·SiO₂계 복합다결정체의 변채효과
김호건,小久保正 漢陽大學校 基礎科學硏究所 1988 基礎科學論文集 Vol.7 No.-
융액 일방향 응고법에 의하여 여러 가지 조건으로 제조한 ?? 계 복합다결정체의 변채 효과를 관찰하고 시료의 미세구조와 변채의 선명도간의 관계를 조사하였다. 그 결과 융액을 0.05cm/h 의 느린 응고속도로 응고시켜 제조한 시료에서 변채가 관찰되었다.특히 2중도가니를 사용한 경우는 변체의 선명도가 높았다. 변채효과는 시료중에 평행하게 규칙적으로 배열된 침상결정에 의한 빛의 반사에 의하여 나타나며 침상결정의 배열을 불규칙하게 하는 인자, 즉 cell 의 크기가 변채의 선명도에 영향을 미치는 것이 확인되었다. Chatoyancy of ?? composite Polycrystal prepared by unidirectional solidification of the melt under various solidification conditions, was investigated and the relation between sharpness of chatoyancy and microstructure of the sample was also studied. Chatoyancy was observed in the sample prepared by unidirectional solidification of the melt at a slow rate of 0.05cm/h and in the case of using double crucibles, more sharp chatoyancy was found. Chartoyancy was caused by the reflection of light on the pararell fibric crystals arrayed reguarly in the mtriax crystal. The size of cells, which brought about irregular array of fibric crystals, influenced on the sharpness of chatoyancy.
Mechanism of Apatite Formation on Bioactive Titanium Metal
Kim, Hyun-Min,Takadama, Hiroaki,Miyaji, Fumiaki,Kokubo, Tadashi,Nishiguchi, Shigeru,Nakamura, Takashi The Korean Ceramic Society 1998 The Korean journal of ceramics Vol.4 No.4
Bioactive titanium metal can be prepared by simple 5M-NaOH treatment and subsuquent heat treatment at $600^{\circ}C$ to form an amorphous sodium titanate on its surface. In the present study, mechanism of apatite formation on the titanium metal was investigated by examining its surface compositional and structural changes in a simulated body fluid. The apatite formation on the metal was found to proceed in the sequence of 1)$Na^+$ ion release from the sodium titanate to form hydrated titania abundant in Ti-OH groups, 2) early and selective binding of calcium ions with the Ti-OH groups to form a calcium titanate, and 3) late binding of phosphate ions to make apatite nucleation and growth. This indicates that Ti-OH groups do not directly induce the apatite nucleation, but via formation of a calcium titanate.
Apatite Formation on Anodized Ti-6Al-4V Alloy in Simulated Body Fluid
Xinyu Cui,김현민,Masakazu Kawashita,Longbao Wang,Tianying Xiong,Tadashi Kokubo,Takashi Nakamura 대한금속·재료학회 2010 METALS AND MATERIALS International Vol.16 No.3
Titania layers were successfully prepared on the surfaces of Ti-6Al-4V alloy via anodic oxidation in H2SO4or Na2SO4 solutions at room temperature. The titania layers consisted of pure rutile or a mixture of anatase and rutile structures after the Ti-6Al-4V alloy had been anodized in 1.0 M H2SO4 solution at 150 V or 0.5M Na2SO4 solution at 100 or 130 V. Good apatite-forming ability was demonstrated in simulated body fluid. However, surface layers with mainly titanium metallic phase or a pure anatase structure did not possess the ability to induce apatite formation. Anodic oxidation is an effective method to prepare bioactive Ti-6Al-4V alloy that can be used as an artificial bone substitute under load-bearing applications.
Fujibayashi Shunsuke,Takemoto Mitsuru,Nakamura Takashi,Matsushita Tomiharu,Kokubo Tadashi,Sasaki Kiyoyuki,Mori Shigeo,Matsuda Shuichi 대한척추외과학회 2021 Asian Spine Journal Vol.15 No.3
The purpose of this study was to introduce our patient-specific bioactive porous titanium implant manufactured using selective laser melting (SLM) and to establish the efficacy and safety of the implant for stand-alone anterior cervical discectomy and fusion (ACDF) based on a prospective clinical trial. We designed a customized ACDF implant using patient-specific data and manufactured the implant using SLM. We produced a bioactive surface through a specific chemical and thermal treatment. Using this implant, we surgically treated four patients with cervical degenerative disc disease and evaluated the clinical and radiological results. We achieved successful bony union in all but one patient without autologous bone grafting within 1 year. We observed no implant subsidence during the follow-up period, and all clinical parameters improved significantly after surgery, with no reported implant-related adverse effects. Our customized bioactive porous titanium implant is a safe and promising implant for stand-alone ACDF.
Apatite-Wollastonite Glass-Ceramics 材料開發 및 치면열구전색재로의 이용을 위한 동물실험 연구
金龍成,申承澈,金豪健,申建澈,小久保正 단국대학교 치의학연구소 1991 논문집 Vol.3 No.-
The authors has experimented with Apatite - Wollastonite - Glass -Ceramic of MgO-CaO-SiO_2-P_2O_5-CaF_2 as biomaterials in order to find out the possibility for use of pit & fissure sealants. 2-rabbits would be selected with insertion of AWGC powder at lower anterior teeth after flap operation. X-ray taking has been done after 2 weeks and 4 weeks breedings. Extracted tooth had been used as samples for SEM observation after sacrificing every 2 weeks. Every samples had been observed at material portion as well as tooth. Such components as Si, Ca and P had been checked by use of EDX and compared the periodic changing data. The obtained results are as follows; 1. Apatite - Wollastonite glass ceramics were prepared with the component of MgO-CaO-SiO_2-P_2O_5-CaF_2 successfully. 2. On intraoral X-ray findings for teeth, A-W materials had been shown the slightly absorption at 2 weeks breeding sample and A-W material had been remove out by attrition otherwise it had been shown the generally radiolucent area as decalcification at 4 weeks breeding sample. 3. On SEM finding for tooth sample after insertion of A-W, the band like intermadiate zone had been found more remarkably at 2nd and 4th week breeding samples, rather than that of the sample which prepared at right after insertion. And this band zone had been fingured diffuse image by gradual. 4. Si and P might be drawn out from A-W material by disolution of A-W through the time, and it was estimated that calcium phosphate as apatite crystal, newly formed biomaterial, would be made of P component from A-W and Ca component from Tooth. 5. It was estimated that A-W material would be more useful at bone than at teeth and adaptable cement should be needed between tooth surface and A-W in case of using for pit & fissure sealant. So more studies for developing the adaptable cement would be needed.