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THE EFFECT OF INCINERATED TOOTH PARTICLES ON OSTEOGENESIS ACCORDING TO PARTICLE SIZE
이규칠,윤창근,Lee, Kyu-Chil,Yoon, Chang-Keun The Korean Academy of Prosthodonitics 1987 대한치과보철학회지 Vol.25 No.1
본 실험의 목적은 치아 회분이 입자 크기에 따라 골형성에 어떠한 영향을 주며 순수 합성수산화 apatite인 calcitite와는 어떠한 차이가 있는가를 평가하기 위하여 수행하였다. 이를 위하여 200mesh와 40mesh의 치아 회분말과 40mesh calcitite를 잡종견의 신선한 발치와에 매식후 1주, 2주, 3주, 4주에 각각 희생하여 임상, X-선상 및 현미경적으로 관찰한 바 다음과 같은 결론을 얻었다. 1. 모든 경우에 조직의 거부반응이 없었다. 2. 40mesh치아 회분의 경우가 200mesh의 치아회분의 경우 보다 골 형성 능력이 현저히 높았다. 3. 40 mesh 치아회분과 calcitite 모두 비교군에 비하여 골 형성이 지연되었다. 4. 40 mesh 치아 회분과 calcitite의 골 형성 능력은 유사하였다.
주 연결장치의 설계변화에 따른 하악 유리단 국소의치의 광탄성 응력 분석에 관한 연구
이규칠,계기성,Lee, Kyw-Chil,Kay, Kee-Sung 대한치과보철학회 1991 대한치과보철학회지 Vol.29 No.2
The purpose of this study was to analyze the magnitude and distribution of stress using a photoelastic model from a distal extension removable partial dentures with three kinds of mandibular major connectors, that is, lingual bar, linguoplate, and swing-lock attachment. A photoelastic model was made of the epoxy resin(PC-1) and hardener(PCH-1) and coated with plastic cement-1 (PC-1) at the lingual surface of the epoxy model and set with three kinds of chrome-cobalt removable partial dentures. A bilateral vertical load of 15kg to the middle portion of the metal bar crossing both the first molars of the right and the left, and a unilateral vertical load of 12.5kg to the right first molar were applied with the use of specially designed loading device and the reflective circular polariscope was used to analyze the photoelastic model under each condition. The following results were obtained : 1. When the bilateral vertical load was applied, the magnitude and distribution of the stress concentration of the edentulous area and the terminal abutment or adjacent teeth was in the order of lingual bar, linguoplate, swing-lock attachment. 2. When the unilateral vertical load was applied, the magnitude and distribution of the stress concentration of the edentulous area and the terminal abutment or adjacent teeth was in the order of lingual bar, linguoplate, swing-lock attachment. 3. When the unilateral vertical load was applied, the magnitude and distribution of the stress concentration of the termial abutment or adjacent teeth on the non-loaded side showed the least stress distribution in case of swing-lock attachment. 4. When the bilateral vertical load and the unilateral vertical load were applied the swing-lock attachment showed the mildest uniform stress distribution on the edentulous area and the alveolar bone around the abutment teeth.
메탄올을 이용한 써모싸이폰형 히트싱크의 성능특성에 관한 실험적 연구
이규칠(Kyu-Chil Lee),김종하(Joung-Ha Kim),윤재호(Jae-Ho Yun),박일환(Il-Hwan Park),권오경(Oh-Kyung Kwon),김민준(Min-Jun Kim) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.11
In this article, the thermosyphon type heat sink using the methanol as a working fluid has been experimentally investgated. Experimental tests on the various working fluid charging rates, input power, and the various air velocites of thermosyphon type heat sink have been carried. For the above experimental condition, the thermosyphon type heat sink using the methanol as a working fluid has evaluated in terms of the thermal resistance. The cooling performance of thermosyphon type heat sink showed superior about 30% to extrudede heat sink In this study optimized performance has been founded that the working fluid charging rates have been thirty five percent of the total volume.
이규칠(Kyu-Chill Lee),김종하(Joung-Ha Kim),윤재호(Jae-Ho Yun),박상일(Sang-Il Park),최윤호(Yun-Ho Choi),권오경(Oh-Kyung Kwon) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.6
This research presented the heat resistance characteristics of heat sink which is newly designed through the experiment. For the same volume and base plate of heat sinks, the experiment of heat transfer characteristics was conducted for forced convection of layered type heat sink. The heat transfer and pressure drop characteristics of the layered type heat sink were comparaed for the vsrious kinds of fin pitches, fin heights and heights of heat sink. The results show that thermal resistance is decresed as the height of heat sink increases and the fin height and fin pitch decrease. From the experimental data of layered type heat sink, the correlation equation of Nusselt number was obtained as follows ; <식 참조>
계기성,이규칠,박상윤,유진영 朝鮮大學校 口腔生物學硏究所 1990 Oral Biology Research (Oral Biol Res) Vol.14 No.-
Authors had the patient wear the upper and lower temporary restoration by which the vetical dimension was raised using the remaining lower removable partial denture for about 4 weeks to evaluate the sign and symptom of temporomandibular joint and the equilibration of the masticatory muscle for the patient who had 'a lost vertical dimension caused by not wearing upper and lower removable partial denture for a long time. The purpose of this clinical study was to evaluate and provide anterior guidance and esthetics by raising and restoring the vertical dimension lost in the past using the remaining lower removable partial denture. The anterior guidance, in connection with centric relation and vertical dimension, must be regarded as the most important factor in reconstructing th stomatognatic system. The informaition for the posterior and anterior tooth morphology can be attained system. The information for the posterior and anterior tooth morpholoty can be attained solely through the anterior guidance and clinical observation. In the presence of a functional anterior guidance, the recording of the condylar paty is unnecessary. The only information which is obtained through the pantographic system is one form of a posterior tooth morhpology which relates to the TMJ anatomy. The anterior guidance, however, with its influence on the lingual contours of the maxillary anterior teeth and in connection with other factors, will more or less determine the position and length teeth. The height and incline of the cusps and the depth of the central fossae are dependent on the steepness or flatness and length of the anterior guidance path. Therefore, one can conclude that in the presence of an anterior disocclution, the occlusal morphology can be determined by the anterior guidance system and clinical observation. From this clinical study, the good results were obtained phonetically, functionally and esthetically by the replacement of the porcelain fused to metal bridge of the upper 1st bicuspids and the upper and lower anterior teeth after an appropriate anterior guidance was established first and then by the delivery of the conventional upper removable partial denture and the lower removable partial denture using key and keyway attachment.
교합고경 상실 수복을 위한 완전구강회복에 관한 임상적 연구
계기성,이규칠,강승종 朝鮮大學校 口腔生物學硏究所 1989 口腔生物學硏究 Vol.13 No.-
Authors had the patient wear the occlusal stabilization splint for 10 weeks to regain a vertical jaw relation that is consistent with the contracted length of the muscles for the patient who had a lost verical dimension caused by the severe attrition and abrasion of all teeth of the upper and lower dental arch. The purpose of this study was to know the PMS concept and its technique to provide an excellent and practical method for determining an occlusal plane that will fulfill all the requirements of a correct occlusion. Immediately afger equalizing the muscle activities of the right and left closing muscles using EM2 to the patient wearing the occlusal splint, the full mouth rehabilitation of the PMS concept and its technique was done. From this clinical study the following results were obtained. 1. The application of using EM2 was necessary to equalize the muscle activities of the right and left closing muscles. 2. The plane of occlusion of the lower posterior teeth was established by incorporating a Curve of Spee which is approximately the arc of a four inch circle using the Broadrick occlusal plane anlayzer. 3. The lingual surface of the maxillary anterior teeth was established with the long centric which had no contact at centric relation occlusion and had contact at centric occlusion without the change of the vertical dimension. 4. The occlusion of the masillary posterior teeth was established by application of the concept of a long dentric and the group functioned occlusion, utilizing a F. G. P technic in the patient's mouth. 5. There was not andy occlusal interferences between the centric relation occlusion and the centric occlusion under every mandibular movement and good results were obtained functionally and esthetically.