저온프로세스를 이용한 고분자필름의 플라즈마 표면처리

조욱,양성채,Cho, Wook,Yang, Sung-Chae 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.5

The plasma processing is applied to many industrial fields as thin film deposition or surface treatment technique. In this study, we investigated large-area uniformed surface treatment of PET film at low temperature by using Scanning Plasma Method(SPM). Then, we measured difference and distribution of temperature on film's surface by setting up a thermometer. We studied the condition of plasma for surface treatment by examining intensity of irradiation of uniformed plasma. And we compared contact angles of treated PET film by using Ar and $O_2$ plasma based low temperature. In our result, surface temperature of 3-point of treating is low temperature about $22^{\circ}C$, in other hands, there is scarcely any variation of temperature on film's surface. And by using Ar plasma treatment, contact angle is lower than untreatment or $O_2$ plasma treatment. In case of PET film having thermal weak point, low temperature processing using SPM is undamaged method in film's surface and uniformly treated film's surface. As a result, Ar plasma surface treatment using SPM is suitable surface treatment method of PET film.

중간 지대치가 존재하는 고정성 국소의치에서 보철물 설계 및 치조골 상태가 응력분포에 미치는 영향

조욱,김창섭,전영찬,정창모,Cho, Wook,Kim, Chang-Seop,Jeon, Young-Chan,Jeong, Chang-Mo 대한치과보철학회 2009 대한치과보철학회지 Vol.47 No.3

연구목적: 하악 제 1 소구치 및 제 1 대구치가 결손 되어 중간 지대치를 갖는 5 본 고정성 국소의치에서 비고정형 어태치먼트의 설계 유무 및 지대치의 지지골 상태에 따른 변위 및 응력분포의 차이를2 차원 유한요소분석을 통해 비교하여 보고자 하였다. 연구 재료 및 방법: 5 본 고정성 국소의치는 일체형과 분할형으로 구분하였으며, 분할형에는 제 2 소구치와 제 1 대구치 사이에 비고정형 어태치먼트를 설계하였다. 지지골은 모두 정상인 경우와 세 개 지대치중 한 개의 지대치에서 임상적 치관 대 치근 비율이 6 : 4 정도까지 골 흡수가 일어난 세 가지 경우를 가정하여 총 네 가지의 지지골 상태를 설정하였다. 제 1 소구치와 제 1 대구치 가공치 중앙에 각각 150 N의 수직 분산하중과, 제 1 대구치 가공치 중앙에 300 N의 수직 집중하중을 가하였다. 결과: 일체형과 분할형 고정성 국소의치 모두에서 하중 시 하방 변위를 보였다. 분할형 고정성 국소의치에서 일체형보다 전방 지대치 지지골에서의 응력은 감소하였으나 중간 및 후방 지대치 지지골에서의 응력은 증가하였다. 지대치의 치조골 흡수가 있는 경우 해당 지대치의 지지골에 국소적인 응력 증가가 나타났다. 결론: 중간 지대치를 갖는 고정성 국소의치를 설계할 경우 유지 장치의 유지 능력과 지대치의 지주 상태 그리고 어태치먼트의 사용에 대한 주의 깊은 고찰이 필요하겠다. Statement of problem: Pier abutments act as a Class I fulcrum lever system when the teeth are incorporated in a fixed partial denture with rigid connectors. Therefore non-rigid connector incorporated into the fixed partial denture might reduce the stresses created by the leverage. Purpose: The purpose of this study was to evaluate, by means of finite element method, the effects of non-rigid connectors and supporting alveolar bone level on stress distribution for fixed partial dentures with pier abutments. Material and methods: A 2-dimensional finite element model simulating a 5-unit metal ceramic fixed partial denture with a pier abutment with rigid or non-rigid designs, the connector was located at the distal region of the second premolar, was developed. In the model, the lower canine, second premolar, and second molar served as abutments. Four types of alveolar bone condition were employed. One was normal bone condition and others were supporting bone reduced 20% height at one abutment. Two different loading conditions, each 150 N on 1st premolar and 1st molar and 300N on 1st molar, were used. Results: Two types of FPD were displaced apically. The amount of displacement decreased in an almost linear slope away from the loaded point. Non-rigid design tended to cause the higher stresses in supporting bone of premolar and molar abutments and the lower stresses in that of canine than rigid design. Alveolar bone loss increased the stresses in supporting bone of corresponding abutment. Conclusion: Careful evaluation of the retentive capacity of retainers and the periodontal condition of abutments may be required for the prosthetic design of fixed partial denture with a pier abutment.

원형탈모증 치료에서 부신피질홀몬제 병변내 주입의 적정 방법 연구

조욱(Wook Cho),임철완(Chull Wan Ihm) 대한피부과학회 1992 大韓皮膚科學會誌 Vol.30 No.6

Intralesional injection of adrenal corticosteroids has widely teen used in the treatment of alopecia areata. But the concentration of the drug and the intrval of the injection are greatly different among the physicians practicing the method. The author evaluated the therapeutie results and untoward effects of the intralesional injetions using two different concentrations on the same lesion devided into two or on the two simultaneousely occurred lesions in each patient, to make exact comparsion of the different concentrations in total 24 patients. Intralesional injections with triamcinolone acetonide 5mg/m a 2 week interval showed appreciable hair regrowing in 4 weeks in 62.5% while 1mg/ml of the drug at equal interval showed appreciable hair regrowing in 6 weeks in 66.7%. But, in the group of 5mg/ml, 16.7% of the lesions showed considerable delay of the hair growing because of the atropy of the skin and hair follicle while no such delay was found in the group 1mg/ml. With the above data, tlie best result would be expected by th concentration between 1mg/ml and 5mg/ml in case of triarncinolone acetonide intralesional injection at 2 week intervals, (Kor J Dermatol 1992;30(8):871-879)

돌발형 균상식육종

조욱(Wook Cho),박수련(Soo Lyeon Park),임철완(Chull Wan Ihm) 대한피부과학회 1993 대한피부과학회지 Vol.31 No.6

A 43-year-old male patient showed well defined, irregular, dark eythematous, thick plaque and tumor with ulceration on the right chest, right axilla, pubis and scrotum, Histopathological findings rervealed atypical lymphocytes showing epidermotrophism and heavy infiltrations in the deep dermis and subcutaneous tissue. The infiltrative cells were positively stained with leukocyte common antigen and T-cell UCHL-1 antigen, but not with L26 antigen. This clinicohisto-pathological features were consstent with dermblade type of mycosis fungoides. The authors report clinicopathological findings of the case with its thrapeutic responses to systemic chemotherapy and radiation treatment. (Kor J Dermatol 1993;31(6): 973-977)

종격동에 발생한 혼합생식세포종양

조욱 ( Wook Cho ),한민수 ( Min Soo Han ),김길동 ( Kil Dong Kim ),김성호 ( Sung Ho Kim ),김준형 ( Jun Hyoung Kim ),이양덕 ( Yang Deok Lee ),조용선 ( Yong Seon Cho ) 대한결핵 및 호흡기학회 2005 Tuberculosis and Respiratory Diseases Vol.58 No.2

The Mixed germ cell tumors of the mediastinum are very quite rare. The Prognosis is generally dominated by the most aggressive component, which is represented by a choriocarcinoma, an endodermal sinus tumor, an embryonal carcinoma, and a seminoma, in desc

피부근염 3예의 치료경험

김한욱,조욱,임철완 ( Han Uk Kim,Wook Cho,Chull Wan Ihm ) 대한피부과학회 1991 대한피부과학회지 Vol.29 No.5

Three cases of dermatomyositis are reported in two woman and one man, all about fifty-years old. Clinical symptoms responded well in two cases with the usual dosage of prednisolone, while one case needed additional intravenous methotrexate and methylprednisolone to suppress the symptoms. Muscle biopsy was valuable in one case and non-specific in two cases. Internal malignancy was found in one case. Because of the relative rarity of the disease and subsequent ?ack of reports on detailed therapeutic experience in Korea, we report the three cases with their clinical course and changes in the laboratory data due to the therapeutic regimens.

범발성 색소이상증 1가족 예

김한욱,조욱,임철완 ( Han Uk Kim,Wook Cho,Chull Wan Ihm ) 대한피부과학회 1991 대한피부과학회지 Vol.29 No.6

착색지르코니아 코어와 전장 도재 사이의 전단결합강도에 관한 연구

강선녀,조욱,전영찬,정창모,윤미정,Kang, Sun-Nyo,Cho, Wook,Jeon, Young-Chan,Jeong, Chang-Mo,Yun, Mi-Jung 대한치과보철학회 2009 대한치과보철학회지 Vol.47 No.3

연구목적: 지르코니아-도재 수복물에 있어 상부도재와 코어 사이의 결합 실패가 종종 보고되어 왔으며 특히 착색지르코니아 코어는 기존의 백색 지르코니아보다 상부 도재와의 결합력이 약하다고 보고된 바 있다. 이 연구의 목적은 착색 지르코니아 코어 위의 상부도재를 적층식과 열가압식으로 제작하여 그 전단결합강도를 알아보고, 이를 전통적인 금속-도재간 결합강도와 비교하여 그 임상적 안정성을 평가하는 것이다. 연구 재료 및 방법: 금속도재군 (MC)을 대조군으로 하였다. 전통적인 금속도재군 (MC)과 지르코니아 코어를 사용한 두가지 군 (ZB, ZP)에 대하여 각 시스템별로 10개씩, 총 30개의 시편을 제작했다. CAD/CAM을 이용해 직경 12 mm, 높이 2.8 mm의 원판형 지르코니아 코어 (Katana zirconia)를 제작하고, 그 상부에 직경 2.8 mm, 높이 3 mm의 도재를 축성했다. ZB군은 CZR을 이용하여 적층법으로 상부도재를 제작했으며 ZP군은 NobelRondo Press ingot를 열가압하여 제작했다. Shear bond test machine (R&B Inc. Daejeon, Korea)을 이용하여 분당 0.50 mm의 속도로 파절이 일어날 때까지 전단력을 가하여 최대적용력 (N)을 측정하여 전단결합강도를 계산하고, 일원배치 분산분석을 사용하여 유의수준 5%에서 검정하였다. 파절양상을 알아보기 위하여 전자주사현미경을 통해 파절단면을 관찰했다. 결과: 평균 전단강도 (SD)는 MC 대조군 29.14 (2.26); ZB 29.48 (2.30); ZP 29.51 (2.32) 이었다. 실험군과 대조군 사이에 유의한 차이는 없었다. 모든 실험군에서 접착성 실패와 응집성 실패가 혼재된 양상을 보였으며, 응집성 실패가 우세했다. 결론: 1. 착색지르코니아 코어와 상부도재들 간의 전단결합강도는 금속 도재간 전단결합강도와 유의한 차이가 없었다. 2. 착색지르코니아 코어의 상부도재를 제작하는 방식에 있어 적층법과 열가압법 간의 전단결합강도에 유의한 차이는 없었다 (P > .05). 3. 파절양상은 응집성 파절이 우세한 가운데 접착성 파절과 응집성 파절이 혼재되어 나타났다. Statement of problem: Delamination of veneering porcelain from underlying ceramic substructures has been reported for zirconia-ceramic restorations. Colored zirconia cores for esthetics have been reported that their bond strength with veneered porcelain is weaker compared to white zirconia cores. Purpose: This study aimed to investigate the shear bond strength by manufacturing the veneering porcelain on the colored zirconia core, using the layering technique and heat-pressing technique, and to evaluate the clinical stability by comparing the result of this with that of conventional metal ceramic system. Material and methods: A Metal ceramic (MC) system was tested as a control group. The tested systems were Katana zirconia with CZR (ZB) and Katana Zirconia with NobelRondo Press (ZP). Thirty specimens, 10 for each system and control, were fabricated. Specimen disks, 3 mm high and 12 mm diameter, were fabricated with the lost-wax technique (MC) and the CAD-CAM (ZB and ZP). MC and ZB specimens were prepared using opaque and dentin veneering ceramics, veneered, 3 mm high and 2.8 mm in diameter, over the cores. ZP specimens were prepared using heat pressing ingots, 3 mm high and 2.8mm in diameter. The shear bond strength test was performed in a Shear bond test machine. Load was applied at a cross-head speed of 0.50 mm/min until failure. Mean shear bond strengths (MPa) were analyzed with the One-way ANOVA. After the shear bond test, fracture surfaces were examined by SEM. Results: The mean shear bond strengths (SD) in MPa were MC control 29.14 (2.26); ZB 29.48 (2.30); and ZP 29.51 (2.32). The shear bond strengths of the tested systems were not significantly different (P > .05). All groups presented cohesive and adhesive failures, and showed predominance of cohesive failures in ceramic veneers. Conclusion: 1. The shear bond strengths of the tested groups were not significantly different from the control group (P >.05). 2. There was no significant different between the layering technique and the heat pressing technique in the veneering methods on the colored zirconia core. 3. All groups presented cohesive and adhesive failures, and showed predominance of cohesive failures in ceramic veneers.

다발성 에크린 한선낭종

송은섭,강광숙,조욱,임철완 ( Eun Sup Song,Kwang Suk Kang,Wook Cho,Chull Wan Ihm ) 대한피부과학회 1991 대한피부과학회지 Vol.29 No.6

임플랜트 지대주 나사의 텅스텐 카바이드/탄소 코팅이 전하중 및 조임회전각에 미치는 영향

신현모(Hyon-Mo Shin),조욱(Wook Cho),정창모(Chang-Mo Jeong) 대한턱관절교합학회 2009 구강회복응용과학지 Vol.25 No.1