Long-term Stability after Reduction of Mandible Fracture by Keyhole Plate: Evaluation at the Time of Plate Removal

Cheon, Kyeong-Jun,Cho, Seoung-Won,Jang, Won-Seok,Kim, Ju-Won,Yang, Byoung-Eun Korean Association of Maxillofacial Plastic and Re 2020 Maxillofacial Plastic Reconstructive Surgery Vol.42 No.-

Background: Various types of miniplates have been developed and used for the reduction of facial bone fractures. We introduced Yang's Keyhole (YK) plate, and reported on its short-term stability. The purpose of this study was to evaluate the long-term stability of the YK plate, as a follow-up study, by examining the patients who had used the YK plate among the patients with the reduction of mandible fractures and who visited for plate removal. Methods: We reviewed the medical records of 16 patients who underwent mandibular fracture fixation using a YK plate (group I) and 17 patients who underwent mandibular fracture fixation using a conventional plate (group II). Assessment was then made on malunion, occlusal stability, discomfort during the application, and clinical symptoms. Results: From January 2015 to December 2017, a total of 36 patients underwent mandibular fracture surgery using a YK plate. A total of 16 patients received plate removal. Among them, 15 were male and 1 female. The average age was 26 years. The applied surgical sites were the 12 on mandibular angle, 4 on mandibular symphysis, and 2 on subcondyle. The application period of YK plate was an average of 335 days. During the same period, 45 people underwent surgery on the conventional plate. A total of 17 patients received plate removal. Among them, 15 were male and 2 females. The average age was 36 years. The applied surgical sites were the 8 on mandibular angle, 4 on mandibular symphysis, and 2 on subcondyle. The application period of the conventional plate was an average of 349 days. No malocclusion occurred at the time of removal, and occlusion was stable. No patient complained of joint disease or discomfort. Conclusion: The YK plate system, in which the screw was first inserted and the plate was applied, for clinical convenience did not cause any particular problem and no significant difference from the conventional plate.

하악골 골절의 임상적 연구

양병은,김용관,유준영,장현석 大韓顎顔面成形再建外科學會 1997 Maxillofacial Plastic Reconstructive Surgery Vol.19 No.2

The mandible plays a crucial role in the vital human functions of breathing, eating, and speaking. No other bone in the body has such a distinctive shape and function. Because of its prominence in the facial structure, the mandible is highly prone to fracture. A chinical study on 122 patients with mandibular fracture who visited Kangnam General Hospital during 4 year(1992-1995) was done by analysing sex, age, cause, fracture site, teeth involvement, treatment method, complication and involvement of other body part. The results obtained were as follows : 1. The occurrence was more frequent in male than in female with the ratio of 5.4 : 1 and most frequently in twenties. 2. Violence was the most common cause of facial mandibular fracture. 3. In mandibular fracture, fracture site was average 1.5 sites, most frequently in symphysis and simple fracture was 86.1%. 4. As treatment methods, open reduction(78.6%) was used more frequently than closed reduction(21.4%) 5. Post-operational complication occurred in 27.0% of the cases. 6. Other injuries that were related to maxillofacial fracture occurred in 25.4%.

HPLC-MS/MS를 이용하여 혈장 중 레보티인정의 정량분석

채석,오형근,이상선,김형기,손동렬,염윤기,맹주양,권준택 순천향의학연구소 2008 Journal of Soonchunhyang Medical Science Vol.14 No.2

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고압 커패시터의 고장 분석을 통한 신뢰도 예측

양석준,김진우,신승우,이희진,신승훈,유동수,장석원 한국비파괴검사학회 2001 한국비파괴검사학회지 Vol.21 No.6

본 논문은 고압 커패시터의 고장분석과 신뢰성 예측 결과를 다루고 있다. 부품의 수명과 고장률을 예측하기 위해서 두 가지 방법으로 고장 모드와 고장 메커니즘을 연구하였다. 에폭시 수지로 성형된 고압 커패시터가 절연내압 시험 하에서 저항이 제로로 되는 고장에 대하여, 근본원인 고장분석 체계를 효과적으로 수립함으로써 고장 메커니즘의 원인을 분석하였다. 특히 세라믹-에폭시 계면에서의 절연파괴 고장 현상이 강조되었으며, 본 연구에서 얻어진 결과의 타당성은 마그네트론에 장착된 고압 커패시터의 열사이클 시험 수행에 의한 가속시험 결과로부터 입증되었다. 시험 결과들은 결함이 있는 로트를 신속히 규명하고 B10수명을 결정하는데 유용하게 사용할 수 있다. 또한, 유전체의 절연파괴에 대해서 부하-강도 간섭모델을 이용하여 고장률을 예측하였다. This paper presents a result of failure analysis and reliability evaluation for high voltage ceramic capacitors. The failure modes and failure mechanisms were studied in two ways in order to estimate component life and failure rate. The causes of failure mechanisms for zero resistance phenomena under withstanding voltage test in high voltage ceramic capacitors molded by epoxy resin were studied y establishing an effective root cause failure analysis. Particular emphasis was placed on breakdown phenomena at the ceramic-epoxy interface. The validity of the results in this study was confirmed by the results of accelerated testing. Thermal cycling test for high voltage ceramic capacitor mounted on a magnetron were implemented. Delamination between ceramic and epoxy, which might cause electrical short in underlying circuitry, can occur during curing or thermal cycle. The results can be conveniently used to quickly identify defective lots, determine B10 life estimation each lot at the level of inspection, and detect major changes in the vendors processes. Also, thd condition for dielectric breakdown was investigated for the estimation of failure rate with load-strength interference model.

공조시스템을 적용한 석실 고분내 온ㆍ습도 분포

전용두,이금배,박진양,고석보,전희호 公州大學校 工學硏究院 生産技術硏究所 2005 論文集 Vol.13 No.-

Although the importance of good conservation of historic sites including ancient royal tombs is well aware, still not much attention has been paid for the facilities and systems to preserve those historic sites, which includes precious artifacts as wall paints and carved works, etc. Even the general understanding about the environment of the underground space of tombs is not satisfactory. In Korea, researchers have recently begun addressing the above issue and are making efforts to develop suitable HVAC(heating, ventilating and air-conditioning) systems for conservation of tombs. An experimental investigation was carried out to study the behavior of the HVAC system installed for a tomb. This tomb resembles in size and shape the original stone built tomb of Baek-je Dynasty, which dates back to 6th Century in southwest part of Korean peninsula. In this study, an HVAC system for a tomb(D×W×H=1.3m×3.0m×1.2m) was installed to maintain sui표 indoor conditions for conservation of tomb. The temperature and humidity inside the tomb were measured different of the setting. Finally, performance of the HVAC system is presented and discussed.

교통사고로 내원한 접형척추(butterfly vertebra) 환자 1예 보고

염석란,이근,박철완,양혁준,현성열,류일,진욱 대한응급의학회 2001 대한응급의학회지 Vol.12 No.3

A butterfly vertebra is a rare, but very important congenital anomaly that must be differentially diagnosed with compression fracture of the vertebral body. It has characteristic findings on simple X-ray, CT, and MRI. These findings are an anterior wedging contour on the sagittal image, a widening of the transverse diameter on the coronal image, adaptations of nearby vertebral endplates on the sagittal image, communicated intervertebral disc spaces on the sagittal and the coronal images, a well-defied midline bony defect with a sclerotic margin in the vertebral body on the axial image, and a normal body signal intensity on MRI. Because of legal problems and further plans for treatment, close attention must be given to patients who complain of back pain and who have decreased anterior height of the vertebral body after trauma. In those patients, a butterfly vertebra must be differentially diagnosed with compression fracture of vertebral body. We report one such case here.

주요우울증에서 우울과 불안 증상의 심각도에 따른 뇌파 A1,A2, Percent 비대칭 지표들의 특성 연구

이준석,양병환,오동열,김기성 大韓神經精神醫學會 2007 신경정신의학 Vol.46 No.2

Objectives : In this study we investigated characteristics of asymmetry pattern of EEG in patients with major depressive disor-der according to the severity of depression and anxiety symptoms, employing A1, A2, and Percent (PCT) asymmetry indices. Methods : Subjects involved in this study were 11 healthy controls and 11 patients with major depressive disorder who have taken no medicines for four weeks just before the study. These subjects were selected so that the two groups can have no difference in gender and age. Beck Depression Inventory (BDI), 17-item Hamilton Depression Rating Scale (HDRS), Zung's Self-Rating Depression Scale (SDS) and Spielberger's State-Trait Anxiety Inventory (STAI) were used to evaluate depression and anxiety symptoms, respectively. Resting EEG was recorded &om F3, F4, C3, C4, T7, T8, 01 and 02 electrode sites. Results : The temporal region showed a difference in A1, A2, and PCT asymmetry indices between the depression group and the control group. Frontal (F3, F4) and temporal (T7, T8) regions showed correlation between STAI-T score and A1, A2, and PCT asymmetry indices. Conclusion : The results of this study showed that EEG A1, A2, and PCT asymmetry indices can be used as useful indices for depression. Also, it was found that trait anxiety had influence on A1, A2, and PCT asymmetry indices.

골반내에 발생한 Proximal-type 유상피성 육종 1예

길준철,이상수,전병화,김성훈,손우석,목정은,박양순,강길현 대한부인종양 콜포스코피학회 2003 Journal of Gynecologic Oncology Vol.14 No.4

유상피성 육종은 매우 드문 악성 연조직 육종으로, 전형적인 경우들은 주로 젊은 남성의 수부, 전완부와 같은 신체의 원위부에 피하 혹은 심재성 피부 종괴로 발생하며, 조직학적 소견상 적은 비정형성을 나타내는 유상피성 세포와 방추형 세포의 증식에 의한 다발성 결절 형태의 배열을 보인다. 최근에 전형적인 유상피성 육종과 조직학적 유사성을 가지나 더 공격적인 형태인 proximal-type 유상피성 육종이 보고되었으며, proximal-type은 전형적인 유상피성 육종에 비하여 현저한 유상피성 세포의 발현과 매우 심한 비정형성을 나타내며, 세포가 매우 크고, 소포성 핵과 뚜렷한 핵소체를 보이며, 자주 rhabdoid 세포의 양상을 띈다. 임상적으로는 전형적인 형태에 비하여 호발 연령이 조금 늦고, 주로 체간부에, 특히 골반, 회음부, 생식기 등과 같은 심부에 발생하고, 더욱 공격적인 양상을 나타낸다. 저자들은 13세 소녀에서 원발부위를 알 수 없는, 골반내에 발생한 proximal-type 유상피성 육종 1예를 경험하여, 문헌 고찰과 함께 보고하는 바이다. Epithelioid sarcoma is a rare malignant soft-tissue sarcoma with an unknown histiogenesis, typically presenting as a subcutaneous or deep dermal mass lesion in the distal portions of the extremities of young adults. Recently, a more aggressive, so-called 'proximal-type' epithelioid sarcoma has been reported. In contrast to conventional epithelioid sarcoma, the proximal type is characterized by a predominantly large cell epithelioid cytomorphology, marked cytologic atypia, and frequent occurrence of rhabdoid features in most patients. Proximal-type epithelioid sarcoma has a predilection for appearing in the genitalia, especially the vulva, penis, pelvis and buttocks. Also this lesion appears to be somewhat more aggressive or at least metastasizes earlier than the conventional epithelioid sarcoma. We report a 13-year-old girl who presented with a buge mass filling the pelvic cavity which was painful, hard and fixed on palpation, and was radiologically diagnosed as a malignant germ cell tumors on the CT scan. The mass was surgically excised and pathologically proved to be an proximal-type epithelioid sarcoma of unknown origin.

한국인에서의 CYP2C19 돌연변이 유전자형의 다형성에 관한 연구

채석,채상우,양동규,김형기,권준택,염윤기 순천향의학연구소 2000 Journal of Soonchunhyang Medical Science Vol.6 No.2

The S-mephenytoin 4'-hydroxylase (CYP2C19) metabolizes a number of clinically used drugs and shows a marked interethnic difference in the incidence of the poor metabolizer (PM). Recent studies have found a third (CYP2C19*4) and forth (CYP2C19*5) mutations in Caucasians. In the present study, we genotyped 536 healthy unrelated Koreans for functionally defective alleles, CYP2C19*2, CYP2C19*3, CYP2C19*4, and CYP2C19*5. Detection of the normal (CYP2C19*1) and defective alleles was performed by polymerase chain reaction/restriction enzyme analysis. The genomic DNA was isolated from peripheral blood. The allelic frequencies of the wild-type (CYP2C19*1) and CYP2C19*2 were 72.6% and 27.4%, and the wild-type (CYP2C19*1) and CYP2C19*3 were 85.1% and 14.9%, respectively. For each CYP2C19*2 and CYP2C19*3 the observed number of three genotypes were similar to those calculated in accordance with the Hardy-Weinberg equation. The frequencies of homozygotes for CYP2C19*2, CYP2C19*3 and compound heterozygotes were 9.7%, 2.8% and 4.2%, respectively. The mutants of CYP2C19 were identified in 36 subjects (16.7%). The mutated CYP2C19*4 and CYP2C19*5 alleles were not detected in this study. These results suggest that frequency of mutants of CYP2C19 in Koreans resembled the Orientals rather than Caucasians, and we founded the racial variability of the frequencies of the CYP2C19*4 and CYP2C19*5 alleles in the Orientals.

흉골골절이 의심되는 외상환자에서 초음파의 진단적 효용성

염석란,김재광,이근,박철완,양혁준,현성열,임용수,진욱 대한응급의학회 2001 대한응급의학회지 Vol.12 No.3

Purpose: This study compared the value of ultrasonography(US) in the diagnosis of sternal fractures with those of conventional radiography and bone scan. Material and Method: From March 2000 to March 2001, in Gil Medical Center, Gachon Medical College, 44 patients(22 women and 22 men, mean age 46 years, range 5∼81 years) complained of tenderness in the sternal area. The cases histories of these patients with clinically suspected sternal fracture due to blunt trauma were prospectively studied. At the time of admission, conventional radiography(sternal view) was done. At one day after admission, sternal ultrasonography was obtained, and after 4∼5 days, a bone scan was done. Sternal ultrasonographic findings, conventional radiographic findings, and bone-scan findings were compared. In addition, a 12-lead ECG was done. When it was necessary, cardiac enzyme was checked and echocardiography was performed. Result: In 21 of 44 patients(48%), a sternal fracture was found by sternal US. Only 9 of 21 patients (43%) were diagnosed as having a sternal fracture by using conventional radiography. 23 of 44 patients (52%) have negative findings on sternal US; they also had negative findings on conventional radiography. Except for 7 unchecked patients, 13 of 21 patients(62%) were diagnosed as having a sternal fracture by bone scan, and among the 23 patients who had negative findings on sternal US, the 19 patients checked with a bone scan also had negative findings. Conclusion: Sternal US can find sternal fractures that are difficult to find on conventional radiography. Compared with bone scan, sternal US takes a shorter time and sternal US is not difficult. Additionally, combined lesions with sternal fractures(peristernal hematoma, soft tissue swelling) and costar cartilage fractures are diagnosed more easily when using sternal US.