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Dentin Bonding Agent의 근관폐쇄(根管閉鎖) 효과(效果)에 관(關)한 실험적(實驗的) 연구(硏究)
민효기,민병순,최호영,박상진,Min, Hyo-Kie,Min, Byung-Soon,Choi, Ho-Young,Park, Sang-Jin 대한치과보존학회 1988 Restorative Dentistry & Endodontics Vol.13 No.1
The purpose of this study was to, examine the sealing ability of the denting bonding agent, when used with gutta percha cone, as a root canal sealer. Seventy two upper and lower extracted human teeth with single root were randomly selected and instrumented in a conventional method with K-file. After instrumentation and dry the canal with paper point, there were divided into three groups and twenty four teeth in each group were filled with the following material; In group I: Scotchbond in combination with gutta percha cone. In group II: AH 26 in combination with gutta percha cone. In group III: Tubli-Seal in combination with gutta percha cone. All specimens were immersed in Indian Ink, decalcified, and cleared. The depth of dye penetration into the canals were evaluated by caliper at the intervals of 1 day, 1 week, 2 weeks. The results were as follows; 1. Depth of dye penetration for all groups increased with time. 2. As to difference in mean dye penetration at time interval of 1 day and 14 days, Scotchbond group exhibited the smallest value as 0.53mm and Tubli-Seal group exhibited the largest value as 0.70mm. 3. There was the difference of dye penetration between each group, but its difference was not significant, statistically.
민효기,Min, Hyo-Kie 대한치과보존학회 1987 Restorative Dentistry & Endodontics Vol.12 No.2
This study was designed to investigate the changing depositional pattern of inorganic enamel substances during enamel formation and maturation. For this purpose, white rat incisors which continuously grow and develop during the life, were chosen as specimens. And after treated with 20% KOH solution, outer surface of forming inorganic enamel were observed with the scanning electron microscope, dividing into 6 types according to the forming pattern from apical to cuspal direction. The observations lead to the following conclusions: 1. During the initial enamel forming stage, inorganic enamel substances were deposited with very irregular pyramidal shape on the root dentin surface. 2. During the enamel forming stage, inorganic enamel substances were deposited with relatively regular hexagonal, honey-comb appearance. 3. During the later enamel forming stage, inorganic enamel substances were deposited with very irregular and roughly amorphous appearance. 4. During the later enamel maturating stage, very small and round inorganic enamel substances were deposited densely, and made a flat enamel surface.
민효기,이상섭 한국폐기물자원순환학회(구 한국폐기물학회) 2014 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2014 No.-
활성탄은 높은 비표면적, 미세기공 그리고 표면 작용기를 지닌 물질로써 수처리 및 가스상 오염물질을 제거하기 위한 용도로 사용되고 있다. 활성탄은 흔히 나무, 석탄, 코코넛 껍질과 같은 탄소를 포함한 유기체로부터 탄화공정과 활성화 공정을 거쳐 제조 할 수 있다. 폐수 처리 후 잔존물인 하수슬러지 또한 탄소를 포함한 물질로써 활성탄으로의 제조가 가능하다. 런던 협약에 의해 하수 슬러지 해양투기가 금지되는 상황에서 하수슬러지를 활성탄으로 재활용하는 방안을 연구하고자 한다. 본 연구에서는 하수 슬러지를 활성탄의 원료물질로 사용하였을 때 탄화단계의 최적조건을 결정하였다. 탄화공정을 거쳐 생성된 탄화물은 연속적으로 활성화 단계로 이어졌으며, 수증기를 이용한 물리적 활성화를 통해 활성탄을 제조하여 그 물성을 평가하였다.