악교정 수술을 위한 석고모형 수술시의 계측오차

이상휘,이승훈,주현호,원동환,Lee, Sang-Hwy,Lee, Seung-Hoon,Ju, Hyeon-Ho,Won, Dong-Hwan 대한구강악안면외과학회 2001 대한구강악안면외과학회지 Vol.27 No.1

The errors in orthognathic surgery can occur during the preoperative preparations including the model surgery, but till now there's been some lack of reserches about them. So we wanted to verify the accuracies in measurements used in model surgery. We compared the accuracy of measurements by vernier calipers, which has been the main measurement tool for conventional model surgery, and that by height gauge, which is recently claimed to be more accurate, with 3 dimensional coordinate analyzer. We could have following results and have a plan to use them for the invention of new model surgery techniques. 1. The measurement errors in Group 1, which mean the difference between "the measurements by 3-D analyzer"and "the measurements by height gauge", were small enough with the range of $0.1{\sim}0.2mm$ in all planes. 2. The mean error in Group 2, which is the differences between the measurements of 3-D analyzer and those of vernier calipers, was 1.1mm. 3. The measurement errors in Group 2 were variable according to the factors including the differences of individuality and expertness of each measurers. But in case of Group 1, they were small and not variable by the expertness. 4. The measurements were more accurate at the points in anterior teeth than in molar teeth in Group 1 and 2. 5. The errors after model surgery increased remarkably, compared with those before surgery in Group 2. And the situation was different in Group 1 in that errors decreased after surgery. According to these results, it assumed that the measurements with height gauge during the model surgery for orthognathic surgery are accurate enough and can be maintained, regardless of complexity of models, individuality, or expertness of measurers.

서울시 철도사고 상설 안전·조사기구 설치에 대한 정책적 제언

이상휘(Sang-Hwi Lee),최선화(Seon-Hwa Choi),이윤진(Yun-Jin Lee),김현주(Hyun-Joo Kim),권미선(Mi-Sun Kwon),최영식(Young-Sik Choi) 한국철도학회 2017 한국철도학회 학술발표대회논문집 Vol.2017 No.10

하악 제3대구치 발치후의 이감각증에 관한 임상적 연구

이상휘(Sang Hwy Lee),박형식(Hyung Sik Park) 대한구강악안면외과학회 1991 대한구강악안면외과학회지 Vol.17 No.3

This is a prospecitive clinical sytudy to evaluate and predict the clinical incidence, predictable contributing factors and prognosis of dysesthesia following surgical removal of mandibular third molars. The author stuies 368 patients(414 lower third molars) who had been treated by Dept. of Oral and Maxillofacial Surgery at Yonsei University and Dept. of Dentistry at Wonju Christina Hospital during Oct, 1988 through Sep., 1989. the obtained results were as follows ; 1. The incidence of dysesthesia after surgical removal of lower third molars was 4.1% (17 of 414 teeth). 2. The predictable etiologic factors for Dysesthesia were 1) Distoangulation, 2) Radiolucent band or displacemennt of canal on the radiographs, 3) Exposed inferior alveolar canal, remarkable hemorrhage and/or unplanned root fractures during operation. 3. The incidence of dysesthesia in extracted teeth which were not related directly and/or indirectly to surgical trauma on imferior alveolar nerve, vessels ound/or canal walls during operations was 3.5% of total group and 76.5% of dysesthesis group. 4. Occurrences of dysesthesia were not correlated with sex, age, depth of teeth impatction, preoperative inflammation, postoperative swelling, and difficulty of operation. 5. The psychological states of dysesthetic patients were not different from those of normal individualls. 6. Dysesthesia after removal of mandibular 3rd molars could be resolved during 4-6 months in this study, though statistically insignificant.

성견 하악골 상행지 수직 골절단술후 조기 기능시의 골치유에 관한 연구

이상휘(Sang Hwy Lee),박형식(Hyung Sik Park) 대한구강악안면외과학회 1997 대한구강악안면외과학회지 Vol.23 No.3

This investigation is an experimental study of the bone healing and remodeling process after Vertical Ramus Osteotomy(abbreviated as VRO) with early mobilization in adult dogs. Nineteen dogs were divided into three groups. Normal Control Group(N=2) was free of surgery. Experimental Group I(n=5) received only VRO without any intentional movements of distal fragments, and Experimental Group II(n=12) got VRO and backward driving of distal fragments. Animals were killed serially and the operated sites were reviewed grossly and histopathologically after the plain radiographs and Magnetic Resonance Images(abbreviated as MRI) were taken. The obtained results are as follows : 1. The early bone healing after VRO occurred mainly by the fusion of endosteal and subperiosteal calluses, and osteoinduced calluses from the cortices of fragments in intramembranous bone formation process. And the cartilagmous bone formations, which were considered to be associated with early functional movements of the mandible, were evident at the Junction of these calluses. 2. The overlapping cortices of each fragment were fused by the osteoinduced calluses after decreased mobility of fragments mainly achieved by the subperiosteal calluses at the lateral and posterior part of pterygomasseteric sling. 3. Osteocytes in the cortices of fragments were dead by ischemia and the marrow tissues were predominantly replaced by fibrous tissues in early stages. Active revascularization in the cortex and formation of new bone in the marrow, seen as the cancellous bones, were observed almost simultaneously and they were maintained until the 8th week when bone unions were confirmed. 4. Morphology of the mandible was changed by remodeling of the bone with reattachments of adjacent muscles after the 8th week. Callus in the gap was changed more and more into the compact bone after the 8th week, which united the proximal and distal fragments securely. 5. Low or iso-signal intensity at the cortex of fragments in early stages of MRI was being increased from the 4th week till the 12th week after VRO. The marrow spaces had high signal intensities on the T2-weighted images in early stages, but they returned to normal T1 and T2 high signals after the 12th week. 6. Signal intensities of the interfragmentary gap were high at the early stages and were gradually decreased to low signals at the 24th week. Atrophy of the masseter muscles with the high signal spots suggesting the increased vascularity was seen from the 2nd week, but the recovery of muscular volume with disappearance of high signal spots were also observed after the 8th week. In summary, the overlapped fragments made by VRO were completely healed by true bony union in adult dogs, even though they had cortex to cortex overlapping and early mobilizations had been allowed. Development of caelluses through the intramembranous bone formation, and the cartilaginous bone formations at the union of them wre mainly involved in the early bone healing. Direct communication of the marrows of the both segments was not found in this investigation, and more advanced study will be needed to explain the details of the fate of bony union after VRO.

QC기법을 이용한 지하철 안전사고 감소에 관한 연구

이상휘(Sang Hwi Lee),최상호(Sang Ho Choi) 한국철도학회 2015 한국철도학회 학술발표대회논문집 Vol.2015 No.10

1,000만 서울시민의 발로써 지난 40년간 대중교통의 중추적인 역할을 해온 서울메트로는(1~4 호선 운영) 전국 도시철도 수송의 45% 이상을 담당하고 일 평균 이용객 422만(2014년)이상 시민을 수송하는 명실상부한 대중교통의 동맥으로 자리매김 하게 되었다. 이렇게 수많은 사람들이 이용하는 지하철에서 최근 발생되고 있는 안전사고를 분석한 결과, 이용객 부주의 및 승무원의 미인지로 인한 사고는 오히려 증가되고 있는 실정이다. 따라서 본 연구에서는 지하철에서 발생하는 안전사고를 운행업무 중심으로 QC(Quality Control)기법을 이용하여 분석함으로써 안전관리 향상 방안에 대해 제시하고자 한다. With 1,000 ten thousand Seoul public opinion feet for last 40 all Seoul metro to do the duty which public transportation is central (1~4 line operation) takes charge of the above 45% of the nationwide city rail traffic and it transports the citizen above average per day visitor 4,220,000 (2014) with the artery of the public transportation which is true to the name every Kim place to make do, it became. The result which analyzes the accident which occurs recently from the subway which the like this numerous people uses, the accident which is caused by with of visitor carelessness and crew member is the actual condition which is increasing rather. From the research which it sees consequently the accident which occurs from the subway it uses QC(Quality Control) techniques in the operation business center and it analyzes with under presenting boil in about safety supervision improvement plan.

구강악안면 외과 환자관리 전산화

이상휘(Sang hwy Lee),김일현(Il hyeon Kim) 대한구강악안면외과학회 1994 대한구강악안면외과학회지 Vol.20 No.4

Authors developed the patent database mangement system for oral and maxillofacial surgery, using a IBM compatible personal computer and a spreadsheet database program Excel . We adopted the automatic diagnosis-description system, which required less input load errors, using tips that could help users manage clinical data with ease. It did serve an easy accumulation of clinical data and a rapid searching for wanted data during our clinical study. On our way for the development, we realized that we need a new standardized classification of diseases and operations that are fit to our situations, which would let us have great chances to develop our clinical patient management system.

간 경변증 환자의 구강악안면외과적 처치

이상휘(Sang Hwy Lee),이승훈(Seung Hoon Lee),주현호(Hyun Ho Joo),원동환(Dong Hwan Won) 대한구강악안면외과학회 1999 대한구강악안면외과학회지 Vol.25 No.1

기존 질병을 가진 환자들의 치료를 위해서는 간 경변증의 병태생리를 잘 이해하고 적절한 수술 전, 후 처치를 시행하여야 하며 합병증의 발생에 대비하여야 할 것이다 마찬가지로 간 경변증을 가진 악안면 영역 외상 환자나 감염증 환자에서도 간경변증에 대한 충분한 이해를 바탕으로 치료를 하는 것이 합병증이나 속발증을 막을 수 있는 최선의 방법으로 생각된다. 따라서 각종 검사를 이용하여 간 경변증의 진행 정도와 외과적 처치의 위험 정도를 파악하고 수술이 필요한 경우 술전에 충분히 준비를 하도록 하며 마취나 수술시 그 방법의 선택을 신중히 해야겠다. 그리고 수술후에는 발생 가능한 합병증을 예상하고 치료할 수 있도록 철저히 대비하는 것이 필요하겠다. To evaluate the pathophysiology and surgical considerations for liver cirrhosis in the field of oral and maxillofacial surgery, 4 cases with maxillofacial traumas or infections in different stages of liver cirrhosis were reviewed. Although appropriate medical cares were ensured, 2 patients were died due to complications of the liver disease. Each cases were classified by the Pugh s classification system and analyzed with reference to laboratory findings and hospital courses. For improved understandings of pathophysiology of liver cirrhosis, the coagulopathies, the lowered detoxification, the hepatic encephalopathy, the hepatorenal syndrome, the sepsis, other conditions - ascites, esophageal varix, portal hypertension, etc - and pre or postoperative complications were reviewed. And special emphases were made at the staging of liver cirrhosis in oral and maxillofacial surgery, preoperative preparations, and prevention of intraoperative or postoperative complications.

QC기법을 활용한 승무원 만족도 향상방안

이상휘(Sang hwi Lee),최상호(Sang ho Choi),이상엽(Sang yub Lee) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10

도시철도는 대중교통 수단으로 ‘서민의 발’로서 시민들에게 편리한 공공교통 수단이라는 큰 역할을 담당하고 있으며, 시민이 이용하는 대규모 공공서비스 시설로 ‘안전하고 신속한 이동’을 핵심가치로 하는 다양한 고객만족 서비스를 제공하고 있다. 본 연구의 목적은 이런 도시철도의 최 일선에서 고객들의 서비스를 담당하고 있는 승무원들의 업무프로세스와 만족도의 관계를 QC(Quality Control)기법을 활용하여 첫째, 그에 대한 개선안을 제시하고 둘째, 업무프로세스 개선으로 승무원 만족도에 어떠한 영향을 주는지 분석하여 결과적으로 시민들에게 최상의 질 높은 고객서비스를 제공할 수 있도록 하고자 한다. The city railroad ‘as the foot of the populace’ is the public mean of transportation which is convenient to the citizens with public transportation means and it takes charge of a big role, `is safe with the large scale public service facility which the citizen uses and is quick the customer satisfactory service which is various moves" at core value it provides. The objective of the research which it sees relationship of business process and satisfaction of crew members who take charge of the service of the customers most from the first line of like this city railroad applies QC (Quality Control) techniques, First, improvement it presents in about him, Second, influence what kind of to crew member satisfaction with business process improvement, it analyzes and a resultantly quality of best it will be able to provide high service in the citizens in order, under boil.

성인 하악 과두 골절후의 보존적 치료 효과에 관한 연구

이상휘(Sang hwy Lee),김일현(Il hyun Kim) 대한구강악안면외과학회 1995 대한구강악안면외과학회지 Vol.21 No.3

The authors made a radiographic study with computed tomograms(CT) after 11.8 months on the average of trauma for the 7 adult mandibular condyle fractures, which were dislocated from the fossa at the head or neck. All cases showed good treatment results clinically, with more than 50 mm of maximal interincisal opening and 7-12 mm(average 10.8 & 9.1 mm) of lateral movements. The results of CT radiographic examinations were as follows : 1. The fractured condylar fragments were all in bony union with distal ramal stump of the mandible and there was no evidence of fibrous nor bony ankylosis between fractured condyles and skull bases or zygomas. 2. The newly formed condyles were bigger than the original ones and projected medially, with flat articular surface of condylar heads. But they approximated the original condyiar shapes. 3. New articular or glenoid surfaces articulating with condylar heads were situated more antero-medially at the skull bases and previous glenoid fossas were shallowed by some sclerosis. 4. The ramal heights were obsreved to be shorter, even though no even though no evidence of facial asymmetry clinically. And there were 3 cases in which bony spicules were showed at the medial cortices of rami at the insertion of medial pterygoid muscles. 5. The lateral pterygoid muscles appeared to be shorter and plumper and their attachments were relatively good enough.

스페인 공산당(共産黨)의 전략(戰略)에 관한 연구(硏究) -프랑코 이후 시대(時代)를 중심(中心)으로-

이상휘 ( Sang Hwi Lee ) 전북대학교 사회과학연구소 1983 지역과 세계 Vol.10 No.-