텔레스코픽 크라운 임플란트 지지 피개의치와 치아 지지 피개의치의 하악골내 응력분포에 관한 유한요소분석

이창규,백장현,김태훈,김민정,김형섭,권긍록,우이형 대한치과보철학회 2012 대한치과보철학회지 Vol.50 No.1

PURPOSE. The purpose of this study was to investigate the stress distribution in mandibular implant-supported overdentures and tooth-supported overdentures with telescopic crowns. MATERIALS AND METHODS. The assumption of this study was that there were 2, 3, 4 natural teeth and implants which are located in the second premolar and canine regions in various distributed conditions. The mandible, teeth (or implants and abutments), and connectors are modeled, and analyzed with the commercial software, ANSYS Version 10.1. Stress distribution was evaluated under 150 N vertical load bilaterally on 3 experimental conditions - between canine areas, canine and 2nd premolars, 10 mm posterior to 2nd premolars. RESULTS. Overall, the case of the implant group showed more stress than the case of the teeth group in stress distribution to bone. In stress distribution to superstructures of tooth and implants, there was no significant difference between TH group and IM group and the highest stress appeared in TH-IV and IM-IV. The stress caused from bar was much higher than those of implant and tooth. TH group showed less stress than IM group in stress distribution to abutment teeth and implant. CONCLUSION. The results shows that it is crucial to make sure that distance between impact loading point and abutment tooth does not get too far apart, and if it does, it is at best to set abutment tooth on premolar tooth region. It will be necessary to conduct more experiments on effects on implants, natural teeth and bone, in order to apply these results to a clinical treatment. 연구 목적: 이 연구의 목적은 텔레스코픽 크라운 하악 임플란트 지지 피개의치와 치아 지지 피개의치에서 지대치의 수와 위치에 따른 응력 분산을 비교하기 위함이다. 연구 재료 및 방법: 본 연구에서는 임플란트를 4개 식립하고 임플란트 지지 피개의치로 설계하였고, 식립 위치를 견치와 소구치 부위에 위치 별로 3개 또는 2개 존재시를 실험군으로 설정하였다. 자연치아를 갖는 경우도 견치와 제2소구치 4개를 가진 경우를 대조군으로 설정하고 부위별로 3개 또는 2개를 가지는 경우를 실험군으로 설정하였다. ANSYS Version 10.1 (Swanson, Inc., USA)로 분석하였다. 결과: 악골내 응력의 경우, 전반적으로 임플란트(IM)로만 구성된 경우가 치아(TH)로만 구성된 경우에 비해 응력이 크게 발생하였다. 상부구조의 경우, 치아군(TH)과 임플란트군(IM) 사이의 차이는 크게 없었으며 편측 견치와 제2소구치에 지대치 또는 임플란트가 위치하는 경우 가장 큰 응력이 나타났고 바(bar)에서 발생된 응력이 임플란트와 치아에서 발생되는 응력에 비해 상대적으로 훨씬 크게 발생하였다. 지대치와 임플란트의 경우, 치아군(TH)이 임플란트군(IM)보다 응력이 작게 발생하였다. 결론: 본 연구의 결과로부터 지대치(임플란트 또는 치아)를 설정할 때는 하중작용점과 지대치 사이의 거리가 너무 길어지지 않도록 지대치의 수와 위치를 확보해야 하며 소구치 자리에 지대치를 확보하는 것이 유리하다. 앞으로, 실제 임상에 적용하였을 경우, 임플란트 및 자연치아와 악골에 미치는 결과에 대한 연구가 더 필요할 것으로 생각된다.

한랭노출과 고혈압의 연관성

장태원,김윤규,윤동영,이창희,홍영습,신해림,정갑열,김준연 大韓産業醫學會 2001 대한직업환경의학회지 Vol.13 No.4

Objectives : This study was carried out to suggest preventive methods for hypertension in cold-exposed workers. Methods : In 11 refs·iteration industries, 68 workers working in refrigerated areas more than one time per day were selected as the exposed group, and 68 workers not exposed to cold were selected as the control group. We interviewed the subjects with a questionnaire covering occupational history, and conducted clinical and laboratory tests including measurements of blood pressure and core temperature. Results : The systolic blood pressure in the exposed group(130.0±13.3 mmHg) was significantly higher than that recorded In the control group(118.3±12.1 mmHg), as was the diastolic blood pressure in the exposed group(82.7±8.5 mmHg) versus the control group(77.4±8.7 mmHg). The core temperature in the exposed group(36.1±0.7℃) was significantly lower than that experienced in the control group (36.4±0.5℃). In logistic regression analysis, age, cold exposure severity and milk intake were significant variables, with odds ratios of 5.204(95 % CI 1.440∼18.812), 2.674(95 % CI 1.080∼6.618), and 0.364(95 % Cl 0.141∼0.942) , respectively. Conclusions : Our study suggests that cold-exposed workers have higher a higher risk of hypertension, and that their core temperature is lower. Risk factors affecting hyper-tension of cold-exposed workers include age, cold exposure severity and milk intake. For the prevention of hypertension, cold-exposed workers should minimize cold-exposure time as much as possible.

기관지 탄분 섬유화증 환자의 임상 경과와 고감도 C-반응 단백(high sensitivity C-reactive protein, hsCRP)과의 상관 관계 비교

이규원,옥철호,장태원,정만홍 고신대학교의과대학 2008 고신대학교 의과대학 학술지 Vol.23 No.4

Background: To investigate the association between bronchial anthracofibrosis(AF) and tuberculosis(TB). and the clinical utility of high sensitivity C-reactive protein(hsCRP) for diagnosis of active pulmonary TB in patients with bronchial AF. Method: Eighty three patients(62 women and 21 men ranging in age from 55 to 87), who were diagnosed with bronchial AF by a bronchoscopy, were enrolled in this study. The hsCRP was measured in patient's blood. The hsCRP results were compared with the bacteriological, and clinical finding. Results: The common respiratory symptoms were cough(70%), sputum(35%), dyspnea(20%), and hemoptysis(10%). The sputum AFB smear, culture were positive in 20(22.8%) and 37(44.5%) patients, respectively. The level of hsCRP in patients with postive culture was significantly higher than that of patients with negative culture.(4.67±7.5, 0.90±1.59, p=0.005). Of 63 patients with negative smear, the level of hsCRP in patients(n=18) with positive culture was higher than that of patients(n=45) with negative culture.(3.39±5.78, 0.92±1.50, p=0.013). Of 20 patients with negative smear and positive culture who were empirically treated with anti-TB medication, 11 patients showed radiologic response. and their level of hsCRP was higher than that of 9 patients who showed no radiologic response.(1.56±1.89, 0.81±0.10,p=0.03) Conclusion: hsCRP appears to be useful diagnostic tool for predicting active pulmonary tuberculosis. in patients with bronchial AF.

싱글 튜브 시스템 BTA 工具를 使用한 SM55C 鋼의 深孔 加工 特性에 관한 硏究

全泰玉,全彦燦,沈成輔,張性圭 동아대학교 공과대학 부설 한국자원개발연구소 1994 硏究報告 Vol.18 No.2

The BTA deep hole machining has an increasing demand because of its wide applications and its good productivity. The main feature of the BTA drill is that the tool cutting edges are unsymmetrically located on the boring head. This provides a stabilizing cutting force resultant necessary for self guidance of the boring head. The BTA drills are capable of machining for having large length to diameter ratio in single pass. The study of the accuracy and surface finish of holes produced would reveal quite useful information regarding the process. This thesis deals with the experimental results obtained during single tube system BTA machining on SM55C steel for different machining conditions.

이종재료의 접합강도 향상에 관한 연구

김태규,양장흥,조상봉 경남대학교 신소재연구소 1998 論文集 Vol.10 No.-

최근 이종재료간 접착에 관한 연구가 많이 이루어 지고 있다. 본 연구에서는 이종재료간 접합에 있어서 접합강도를 증대시키는 방법을 찾기 위해서 알루미늄과 에폭시간의 접합강도평가를 수행하였다. 이종재료간 접합강도를 증대시키기 위해서 emery paper, polishing 그리고 chemical etchant 등으로 표면처리를 하였다. optical roughness tester 과 SEM을 사용하여 알루미늄과 에폭시 간의 접합강도를 평가하기 위하여 인장시험과 피로시험을 수행하였다. 결과는 화학작용으로 에칭된 표면을 가지고 있는 알루미늄과 에폭시로 접합된 이종재료들이 에칭되지 않은 경우보다 정적강도와 피로강도가 더 큼을 알 수 있었다. Recently. bonding technique between dissimilar materials has been widely used for structural materials.. In this study, evaluation of bonding strength between Aluminium and epoxy was carried out for finding an enhanced treatment in bonding disimilar materials. In order to enhance the bonding strength of disimilar materials., bonding surfaces were treated employing emery paper, polishing, and chemical etchant. The surface morphology in Aluminium material was investigated, using both optical roughness tester and scanning electron microscope (SEM). Also, tensile and fatigue tests were carried out for evaluating bonding strength between Al-epoxy. As a result, the static and the fatigue strength for boned Al-epoxy materials, where the aluminum surface was etched chemically, were higher than those for the unetched bonding surfaces.

디젤燃料로서 混合油를 사용할 경우의 小型디젤 機關 性能에 관한 硏究

고태규,고장권 濟州大學校工科大學産業技術硏究所 1997 尖端技術硏究所論文集 Vol.8 No.1

This Paper is concerned with the usuability of the blend oil(diesel oil:rape-seed oil=50 : 50. capacity rate) as a fuel oil to reduce the usage of petroleum. Physical and chemical properties of blend oil as fuel oil are studied and analyzed experimentally. Engine performance from 900rpm to 1.900rpm is tested by operating small diesel engine(Ricardo E.6 engine) injected blend oil and also the effects on the engine performance are investigated. The experimental results are summarized as follows : 1. The lower heating value of blend oil is 10.130kcal/kg and flash point is 92℃. The values are different from diesel oil by 4.4% and 6.6%, respectively. 2. The viscosity of blend oil is 15.73 cSt. This value is 4.5 times larger than the value of diesel oil viscosity. but is 3.2 times smaller than the value of rape-seed oil viscosity. 3. P-θ diagram shows that the maximum explosion pressure of blend is 2∼4kg/㎠ higher than that of diesel oil. 4. Brake horse power, specific fuel consumption and exhaust temperature of blend oil are 7.5%, 3.5% and 3.9% higher than those of diesel oil, respectively. The brake thermal efficiency and noise are all most the same level compare to diesel oil. 5. Torque of blend oil is about 3.4% lower than that of diesel oil.

폐허탈 및 농흉을 유발한 기관지 지방종 1예

이규진,이송주,옥철호,장태원,정만홍,김영옥,박성달 고신대학교의과대학 2008 고신대학교 의과대학 학술지 Vol.23 No.4

저자들은 객혈을 주소로 내원한 75세 남자 환자에서 기관지내시경 육안 소견상 양성 종양이 의심 되었으나 조직 검사상 지방종을 확진하지 못하였고 악성종양을 배제할 수 없는 상황에서 종괴에 의한 왼쪽 폐의 허탈과 농흉 때문에 수술적 치료를 시행 하였으며, 수술 결과 기관지 지방종에 의한 폐허탈, 농흉 및 기관지 확장증, 이로 인한 객혈이 발생한 예가 있어 보고하는 바이다. Lipoma is a common neoplasm on soft tissues. However, bronchial lipoma is rare benign tumor. Patients with bronchial lipoma might have a malignant potential, and there were case reports of lung cancer accompanied with lipoma. Therefore, it should initially be treated by fibrotic bronchoscopy or surgery. We encountered a 75 year-old male patients with bronchial lipoma, causing hemoptysis.

기관지 방선균증의 임상 1례

이은영,장태원,정만홍,옥철호,이규원,손창배,이지숙,신은경,서정아,백종현,김영옥 고신대학교의과대학 2007 고신대학교 의과대학 학술지 Vol.22 No.2

Actinomycosis is a chronic suppurative infection, whitch infiltrates mucosa-associated tissues. Thoracic, pelvic and cervicofacial infections of actinomyces are not uncommon, but endobronchial actinomycosis is rarely reported. We report a case of a 29 year old man who presented with a recurrent pneumonia and chronic cough. Fiberoptic bronchoscopy revealed occlusion of the right. lower medio-basal segment bronchus with exophytic endobronchial mass. The diagnosis was confirmed histologically by demonstration of sulfur granules in the bronchoscopic biopsy of the mass. Intravenous administration of amoxacillin and clindamycin followed by oral amoxacillin and clindamycin therapy resulted in complete recovery.

베체트 병에 대한 동서의학적 고찰

유금룡,장규태,김장현 동국대학교 한의학연구소 1999 東國韓醫學硏究所論文集 Vol.8 No.1

만성적이며 재발성 질환인 베체트 병에 대한 한위학적인 진단과 치료의 개념을 도입하고 동서협진의 연구기반올 정립하기 위하여 동서의학적 고찰을 하였다. 서의학적으로는 터키의 피부과 의사인 베체트가 1937년 처음으로 하나의 중후군으로 베체트 병을 제시한 이래로 여러 가지 원인과 치료들이 제시되었으나 아직까지 만족할만한 치료제가 개발되지 못한 상태이며 진단에 있어서 보조적 진단방법이나 질병의 진행상태를 파악할 수 있는 검사방법이 없어 치료에 대한 반응을 객관적으로 측정하기에는 한계가 있다. 한의학적인 많은 임상치료가 시행되었고, 한의학적 임상례를 통하여 볼 때 보편적으로 사용되는 내복약 외에도 침구요법, 외용방, 광선요법 등이 응용될 수 있음을 제시하였다. A literature study was progressed for Introduction of the conception of oriental medical diagnosis and treatment and establishment of studious fundation of current and oriental medical cooperation for Behc¸et's disease to be known chronic and repetitional disease. In current medicine, valid medicine for Behc¸et's disease, from Behc¸et, a turkish doctor, announced it the very first, was not made and objective diagnostic method not existed. Through clinical cases in oriental medical treatment, it was known that, except herbal medication, acupuncture, medicine of external application and beam-therapy were applied.

KAL기 추락에 의한 대량재해의 개인식별

강신몽,이원태,고영창,최상규,김윤희,이홍석,서재관,윤중진,이혜경,최득린,김종열,윤창육,변명식,이장홍 大韓法醫學會 1991 대한법의학회지 Vol.15 No.2

Individual identification is an important part in medicolegal field especially in mass disaster. At July, 27, 1989, KAL KE-803 was crashed on landing at Tripoli International Airport, Liba. The plane was caught in fire and sixty eight Koreans were sacrified. The majority of victims were severely charred and injured. The authors examed all dead bodies and successfully identified all the cases through visual, anthropological, odontological, radiological and pathological methods including fingerprint and blood typing.