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- 저자 : 小久保正 (검색결과 3 건)
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(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.
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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.
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