주입선의 설치방법이 금속의 주조성에 미치는 영향에 관한 실험적 연구

김웅철,Kim, Uoong-Chul 대한치과기공학회 1988 대한치과기공학회지 Vol.10 No.1

The purpose of this study was to evaluate the effect of spure designs and air vent on the relative castability of the nonprecious alloys, commonly used to make ceamometal restorations. Samples of total 30 were constructed and devided into 6 groups according to two variables, sprue design and air bent. The total number of completly cast squares was counted, verified, and recorded. The results obtained were as follows: 1. The runner bar or Rousseau designs yield better castability than reservoir design(P<0.1) 2. When the air vent was attached, only the castability of reservoir design was significantly different from runner bar or Rousseau designs.

우리나라 치과 기공사의 신체 자각 증상과 직업 관련 건강 위험 요인

김웅철,이세훈 대한치과기공학회 2000 대한치과기공학회지 Vol.22 No.1

상악 중절치간 중심선과 해부학적 부위와의 관계에 대한 조사연구

김웅철 高麗大學校 倂設 保健大學 保健科學硏究所 1989 保健科學論集 Vol.16 No.1

The distances from the center line between maxillary right and left central incisors(the dental midline)to the various anatomical landmarks were measured. Fifty five students(thirth four males and twenty one females) who have at least 28 natural teeth including maxillary and mandibular incisors and bicuspids were examined. The resulting data were as follows : 1. There was statistically significant difference between the dental midline and the center line of maxillary labial frenum(p < 0.05). 2. There was no statistically significant difference between the dental midline and the center point of incisive papilla, philtrum line, the center line between two mandibular central incisors, and the median palatine suture line (p > 0.05). 3. There was no statistically significant sexual difference among data. 4. The philtrum line showed the highest value of correspondence to the center line between two maxillary central incisors followed by the center point of incisive papilla, the center line of two mandibular central incisors, median palatine suture line and the center line of maxillary labial frenum at the decreasing rate.

폐암 환자에서 Electronic Portal Imaging Device를 이용한 자세 오차 및 종양 이동 거리의 객관적 측정

김웅철,정은지,이창걸,추성실,김귀언,Kim, Woo-Cheol,Chung, Eun-Ji,Lee, Chang-Geol,Chu, Sung-Sil,Kim, Gwi-Eon 대한방사선종양학회 1996 Radiation Oncology Journal Vol.14 No.1

목적 : electronic portal imaging device(EPID)를 이용하여 폐암 환자에서 시행한 검증 영상을 분석하여 3차원 입체 조형치료계획 시 자세 오차(set-up error)와 종양의 이동 거리를 고려한 적절한 차폐 여유를 평가해 보고자 한다. 대상 및 방법 : 1995년 연세암센터 치료방사선과에 내원하여 EPID가 장착된 Clinac 2100C/D를 이용하여 치료받은 폐암 환자 10명을 대상으로 하였다. 환자 1인 당 1 port에 대한 검증 영상을 매일 얻어 random 오차와 systematic 오차를 구했고, 치료 1회 당 중복 영상을 얻어 종양의 움직임을 구했다. 매일 얻은 검증 영상은 103개이었고, 중복 영상은 10개이었다. 결과 : 전체 10 명의 환자의 x 축, y 축으로의 평균 이동은 각각 1.41 mm, 1.78 mm 이었고 systematic 이동은 표준편차가 x 축, y 축으로 각각 4.63 mm, 4.11 mm이었다. random 이동은 각 환자의 평균 이동으로부터 x 축, y 축으로 표준편차가 각각 4.17 mm, 3.31 mm 이었다. 호흡에 의한 y 축으로의 이동은 평균 12.2 mm이었고, 표준편차는 4.03 mm 이었다. 결론 : 폐암 환자에서 3차원 방사선치료를 시행하려고 할 경우 치료 계획 시 clinical target volume에서 x, y 축으로 각각 10 mm, 25 mm 정도의 여유가 필요하다고 보이며, 치료 초기에 각 환자별로 매일 EPID를 이용하여 얻은 검증 영상과, 중복 영상으로 차폐 여유를 적절히 조절해 주어야 할 것이다. Purpose : The aim of this study is to investigate the random and systematic errors and tumor movement using electronic portal imaging device in lung cancer patients for the adequate margin in the treatment planning of 3-dimensional conformal therapy. Material and Methods : The electronic portal imaging device is matrix ion chamber type(Portal Vision, Varian). Ten patients of lung cancer treated with chest irradiation were selected for this study. Patients were treated in the supine position without immobilization device. All treatments were delivered by an 10 MV linear accelerator that had the portal imaging system mounted to its ganrty. AP or PA field Portal images were only analyzed. Radiation therapy field included the tumor, mediastinum and supraclavicular lymph nodes. A total of 103 portal images were analyzed for set-up deviation and 10 multiple images were analyzed for tumor movement because of respiration and cardiac motion. Result : The average values of setup displacements in the x, y direction was 1.41 mm, 1 78 mm, respectively. The standard deviation of systematic component was 4.63 mm, 4.11 mm along the x, y axis, respectively while the random component was 4.17 mm in the x direction and 3.31 mm in the y direction. The average displacement from respiratory movement was 12.2 mm with a standard deviation of 4.03 mm. Conclusion : The overall set-up displacement includes both random and systematic component and respiratory movement. About 10 mm, 25 mm margins along x, y axis which considered the set-up displacement and tumor movement were required for initial 3-dimensional conformal treatment planning in the lung cancer patients and portal images should be made and analyzed during first week of treatment, individually.

자궁경부 상피내암의 임상적 고찰

김웅철,조성진,박인서 한국의학사 1988 診斷과治療 Vol.8 No.1

관교의치 및 금속 도재 보철물용 Ni-Cr 합금과 Ag-Pd 합금의 재사용에 따른 주조 재현성의 변화

김웅철,Kim, Uoong-Chul 대한치과기공학회 1986 대한치과기공학회지 Vol.8 No.1

The purpose of this study is to evalute the effects of melting and casting procedures on the castability of some N-Cr and Ag-Pd alloys. One Ag-Pd alloy and two Ni-Cr alloys were chosen for study, and the first casting group of these alloys were used as the control, and with which the castability of the first recase group and the mixture group of the first recast and as much amount of the first casting alloy was compared. The results of this study were as follows: 1. The castability of the first recast alloys veried significantly depending upon the presence or abscence of the first casting alloy and the kind of alloys. 2. When the first recast alloy was mixed with as much amount of the first casting alloy, there was no significant difference in castabilityh between the first recast group and the first casting group. 3. When the first recast alloy was used alone, the castability veried significantly depending upon the kind of alloys, i.e., the castability of Rexillium III and Palliag M was decreased significantly when compared with that of the first casting groups, while that of C & B Alloy was not.

납형의 직경 및 소환방법이 도재-금속 보철물용 비귀금속 합금의 주조성에 미치는 영향

김웅철,Kim, Uoong-Chul 대한치과기공학회 1984 대한치과기공학회지 Vol.6 No.1

This Experimental study was performed to study the effect of the heat soaking and the diameter of pattern on the casting ability of three nonprecious alloys manufactured for porcelain-metal restorations, with respect to their ability to reproduce test pieces by casting over a selected range of uniform diameters. Samples of total 60 were constructed and divided into 6 groups according to the two variables, the diameter and the heat soaking. The completed cast samples were examined visually and measured with a caliper calibrated to 0.05mm. The results obtained were as follows: 1. Length cast was significantly related to the diameter to be cast, especially in the case of the marrowest diameter of 230m. 2. Length cast not significantly related to the heat soaking. 3. The completeness of casting was significantly related to the diameter to be cast, particularly in the case of the narrowest diameter of 230m. 4. The completeness of casting was not significantly related to the heat soaking. 5. All of the three nonprecious alloys used for this experiment were significantly different from an ideal alloy in the completeness of casting.

상악 중절치간 중심선과 해부학적 부위와의 관계에 대한 조사연구

김웅철,Kim, Uoong-Chul 대한치과기공학회 1990 대한치과기공학회지 Vol.12 No.1

The distances from the center line between maxillary right and left central incisors(the dental midline) to the various anatomical landmarks were measured. Fifty five students(thirth four males and twenty one females) who have at least natural teeth including maxillary and mandibular incisors and bicuspids were examined. 1. There was statistically significant difference between the dental midline and the center line of maxillary labial frenum(p<0.05). 2. There was no statistically significant difference between the dental midline and the point of incisive papilla, philtrum line, the center line between two mandibular central incisors, and the median palatine suture line(p>0.05). 3. There was no statistically significant sexual difference among data. 4. The philtrum line showed the highest value of correspondence to the center line between two maxillary central incisors followed by the center point of incisive papilla, the center line of two mandibular central incisors, median plaltine suture line and the center line of maxillary labial frenum at the decreasing rate.

치과 캐드캠 시스템의 질 관리와 품질 평가

김웅철 대한치과재료학회 2008 대한치과기재학회 학술대회 Vol.2008 No.11

하악 총의치 전용의 유리섬유 보강재 적용에 따른 적합도 비교 분석

김웅철,김동연,박진영,배소연,강후원,김지환 대한치과기공학회 2018 대한치과기공학회지 Vol.40 No.4

Purpose: The purpose of this study is to evaluate the fitness of lower jaw compete denture with glass fiber. Methods: Lower jaw edentulous model was selected as the master model. Ten study models were produced using Type Ⅳ stone(n=10). Lower jaw trial dentures were produced by the wax denture base and artificial teeth. Conventional complete denture (CD) group was fabricated by excluding glass fiber reinforcement (n=5). Glass fiber complete denture (GD) group was fabricated with glass fiber reinforcement (n=5). The lower jaw trial complete denture was invested using a plaster. PMMA resin was injected and curing was performed. The CD and GD groups measured the fit using silicone replica technology. The measured data was verified by t-test. Results: The anterior area of the CD group showed the smallest value. There was a statistically significant difference in the anterior area of the CD group and the GD group (p<0.05), but there was no statistically significant difference in the posterior area (p>0.05). Conclusion : Complete denture with glass fiber showed low fitness and further study is needed to apply it clinically.