Effects of GaAs (904 nm) Low Level Laser Therapy on Dentin Hypersensitivity

원태희,김기석,Won, Tae-Hee,Kim, Ki-Suk Korean Academy of Orofacial Pain and Oral Medicine 2011 Journal of Oral Medicine and Pain Vol.36 No.4

The aim of the study was to investigate the effects of 904 nm GaAs laser irradiation for patients with hypersensitive teeth and to find the possibility of clinical use of this Low Level Laser Therapy (LLLT) for the control of hypersensitive teeth. Eleven patients visited Dept. of Oral Medicine, Dankook University participated in this study. Each patient contributed at least two or more contralateral pairs of hypersensitive teeth with exposed dentine at cervical surfaces. Total number of teeth used from subjects participated in this study was 50: 25 experimental and control teeth respectively. All participants were treated with 904 nm GaAs diode laser every week during 4 weeks. Tactile and cold (ice stick) tests were carried out before LLLT every week during 4 weeks and 1 week later after the last LLLT by measuring visual analogue scale (VAS) of patients and by measuring a score of electrical pulp tester (EPT) simultaneously. The VAS score in tactile test decreased significantly with time, but there was not statistically difference between those of groups. The score of EPT in the experimental group was significantly higher than that of control group, although there was no change with time. In cold test, there was significant difference between two groups and cold sensitivity of the experimental group significantly decreased with time after every LLL irradiation, compared with that of control group. Based on the results, it is suggested that the 904 nm GaAs laser irradiation could be positively used as an effective, reversible method in treating cervical dentine hypersensitivity.

Muscle Stiffness and Elasticity of Masticatory Muscles on Gum Chewing

원태희,김미은,김기석,Won, Tae-Hee,Kim, Mee-Eun,Kim, Ki-Suk Korean Academy of Orofacial Pain and Oral Medicine 2007 Journal of Oral Medicine and Pain Vol.32 No.4

Some researchers suggested that tactile sensor system would be useful in evaluating masticatory muscles of TMD patients, but there were few studies on the effects of chewing with time. The aim of this study was to investigate the change of elasticity and stiffness for masseter and temporal muscles of normal subjects before, during and after gum chewing and to obtain the baseline data for further researches on the elasticity and stiffness for masticatory muscles of TMD patients. Stiffness and elasticity of their anterior temporalis and inferior masseter muscle were measured bilaterally by a tactile sensor system. Each subject was instructed to sit on a chair for evaluation of masticatory muscles. Before operating the sensor, the thickest skin area over anterior temporalis and inferior masseter muscles were selected as the points to be pressed by a tactile sensor, and marked with a pen. While the teeth of subjects were lightly contacted, the probe of the tactile sensor was placed perpendicularly over the marked point over the skin, followed by computer-controlled movement including gently pressing straight down on the muscle for a second and retracting. All subjects were instructed to chew gum (Excellent Breath, Taiyo Co., Japan) bilaterally with a velocity of 2 times per second for 40 minutes after the first measurement had been performed for the baseline data of all subjects. The measurements had been repeated during chewing with 10 minutes of interval and continued for 40 minutes with same interval after chewing. Resultantly, the decrease of elasticity and the increase of stiffness in masticatory muscles can be seen significantly within 10 minutes after chewing and those were maintained during chewing without significant change with chewing time. The elasticity of muscles was recovered within 10 minutes after stopping chewing, but the stiffness was recovered more lately than elasticity by about 10 minutes. Based on these results, it can be concluded that elasticity and stiffness of muscles would be good indicators to evaluate the masticatory muscles objectively, when more supported by further researches.

소아에서의 흉부둔상

원태희 ( Tae Hee Won ),전영진 ( Yeong Jin Jeon ) 대한외상학회 2003 大韓外傷學會誌 Vol.16 No.2

Background: Despite growing national attention, traumatic injury remains the most common cause of mortality in children, and the clinical manifestations of blunt chest trauma in children are different from those in adult. Methods: We reviewed retrospectively the cases of 45 children patients who were diagnosed with blunt chest trauma and managed in Mok-dong Hospital, Ewha Women`s University, from August 1995 to April 2003. Patients with a simple chest wall contusion were excluded. Results: The mean age was 6.5 ± 3.1 years, and 3-to 8-year-old children were most common. The main cause of blunt chest trauma was traffic accident (37 cases 82%, P<0.01). Pulmonary contusion was the most common injury (34 cases 76%), followed by rib fracture. Pulmonary contusion, tended to be prevalent at a younger age and rib fractures at a older age. However, this difference was not statistically significant (P>0.05). All patients were managed conservatively for chest injury, and two patients died of severe hypoxemia and hemorrhage. The mortality was 4%. Conclusions: The clinical manifestations of blunt chest trauma in children were different from those in adult, and most patients were managed conservatively with good results. More driver`s attention is required to protect children from traffic accident, especially those involving larger car (vans, trucks, buses, and so on) and during backing a car.

승모판막 폐쇄부전에 있어 승모판막 성형술의 단기성적

김경환,원태희,김기봉,안혁,Kim, Kyung-Hwan,Won, Tae-hee,Kim, Ki-Bong,Ahn, Hyuk 대한흉부심장혈관외과학회 2000 Journal of Chest Surgery (J Chest Surg) Vol.33 No.1

Background: Reconstruction surgery of mitral valve regurgitation is now considered as an effective operative technique and has shown good long-term results. Although reconstructive surgery of mitral valve has been performed since 1970s, we have started only in early 1990s in full scale because of small number of the mitral regurgitation compared to mitral stenosis and lack of knowledge from the viewpoint of patients and physicians. Material and Method: From January 1992 to December 1996, 100 patients underwent repair of the mitral valve for mitral regurgitation with or without mitral stenosis in Seoul National University Hospital. 45(45%) of the patients were men and 55(55%) were women. The mean age was 39.9$\pm$14.4 years. The causes of the mitral regurgitation were rheumatic in 61, degenerative in 28 and others in 11. According to the Carpentier's pathological classification of mitral regurgitation 5 patients were type I. 55 patients were type II and 40 patients were type III. 7 patients underwent concomitant aortic valvuloplasty and 8 patients underwent aortic valve replacement. 7 patients underwent Maze operation or pulmonary vein isolation. Result: There were no operative death but 3 major operative complications: 2patients were postoperative low cardiac output syndrome(needed intra-aortic ballon pump support) and 1 patient was postoperative bleeding. There was one late death(1.0%) The cause of death was sepsis secondary to acute bacterial endocarditis. 3 patients required reoperation for recurred mitral regurgitation. There were no statistically significant risk factors for reoperation. The other 96 patients showed no or mild degree of mitral regurgitation 99 survivors were in NYHA functional class I or II. There were two throumboembolisms but no anticoagulation-related complications. Conclusion: We concluded that mitral valve repair could be performed successfully in most cases of mitral regurgitation even in the rheumatic and combined lesions with very low operative mortality and morbidity. The early results are very promising.

뇌농양으로 발견된 폐동정맥루 - 1례 보고 -

강신광,김시욱,원태희,구관우,박상순,유재현,나명훈,임승평,이영,Kang, Shin-Kwang,Kim, Si-wook,Won, Tae-Hee,Ku, Kwan-Woo,Park, Sang-Soon,Yu, Jae-Hyun,Na, Myung-Hoon,Lim, Seung-Pyung,Lee, Young 대한흉부심장혈관외과학회 2001 Journal of Chest Surgery (J Chest Surg) Vol.34 No.12

폐동정맥루는 비교적 흔하지 않은 질환이다. 뇌농양은 폐동정맥루의 드물고, 가장 심각한 합병증이며, 폐동정맥루는 신경학적 증상으로 처음 발현되는 수도 있다. 저자들은 뇌농양으로 발견된 폐동정맥루를 치험하였기에 보고하는 바이다. Pulmonary arteriovenous malformations(PAVM) are uncommon diseases. Brain abscesse could be a rare and devastating comlplication of PAVM. Central nervous complaints may be the first manifestations of PAVM. We report a case of PAVM presented by brain abscess which was treated by craniotomy.

26 kHz 대역 음파를 이용한 수중 음향 통신모뎀 구현

엄정환 ( Jeong-hwan Eom ),원태희 ( Tae-hee Won ),전준호 ( Jun-ho Jeon ),박성준 ( Sung-joon Park ) 한국정보처리학회 2011 한국정보처리학회 학술대회논문집 Vol.18 No.2

최근 수중 통신에 대한 관심이 높아짐에 따라 수중 통신 기술 개발을 위한 연구가 활발히 이루어지고 있다. 본 논문에서는 수중 음향 통신 모뎀을 위한 연구를 수행하였고, 모뎀의 성능을 한강에서 실험을 통해 검증하였다. 모뎀에 사용된 MCU는 ARM Cortex-M3이며, 모뎀의 최대 데이터 전송 속도 및 최대 전송 거리는 각각 200 bps, 150m 이다.

수중 음향 통신 모뎀 구현 및 성능 평가

전준호 ( Jun-ho Jeon ),원태희 ( Tae-hee Won ),엄정환 ( Jeong-hwan Eom ),박성준 ( Sung-joon Park ) 한국정보처리학회 2011 한국정보처리학회 학술대회논문집 Vol.18 No.2

최근 수중 통신에 대한 관심이 급증함과 동시에 수중에서 음성, 영상과 같은 멀티미디어 데이터 전송에 대한 요구가 증가하고 있다. 이러한 추세에 발맞춰 수중 통신에 대한 연구가 활발히 진행되고 있으며 본 논문에서도 수중 통신 모뎀에 대한 연구를 수행하였다. 본 논문에서는 70 kHz의 초음파를 이용하는 진폭 편이 변조 방식의 수중 음향 통신 모뎀을 구현하고 구현한 모뎀의 성능을 평가하였다. 실험은 경기도 양평 양수리에 위치한 북한강에서 이루어졌으며, 실험을 통해 전송 거리 50 m, 전송 속도 200 bps, BER 성능 1×10-3 의 결과를 얻었다.

Tuberculous Empyema Necessitatis with Osteomyelitis, a Rare Case in the 21^st Century

김한울,임고운,조혜경,이현주,원태희,박경운,김경효,Kim, Han Wool,Lim, Goh-Woon,Cho, Hye Kyung,Lee, Hyunju,Won, Tae Hee,Park, Kyoung Un,Kim, Kyung-Hyo The Korean Society of Pediatric Infectious Disease 2011 Pediatric Infection and Vaccine Vol.18 No.1

흉벽 천공성 농흉(Empyema necessitatis)은 농흉이 흉막 외의 공간으로 확장되어 나간 것을 말한다. 결핵성 흉벽 천공성 농흉은 결핵의 드문 합병증으로서 특히 소아에서는 더욱 드물다. 본 저자들은 결핵에 노출된 병력이 없던 21개월 남자아이에서 7번째 늑골의 골수염에 동반된 결핵성 흉벽천공성 농흉을 경험하여 이에 대해 보고한다. 우리는 환자의 진단과 치료를 위해 수술적 치료를 시행하였고, 조직을 이용한 PCR 및 분자생물학적 검사에서 M. tuberculosis complex를 확인하여 항결핵제를 이용해 합병증 없이 치료하였다. Empyema necessitatis refers to empyema that extends into the extrapleural space through a defect in the pleural surface. Tuberculous empyema necessitatis is a rare complication of tuberculosis. We experienced a 21-month-old boy with tuberculous empyema necessitatis with osteomyelitis in the right $7^{th}$ rib. He presented with a mass on the right lateral chest wall, which was soft and nontender, enlarging for one month. He also had mild fever. The plain radiograph of his chest revealed soft tissue swelling and calcified lymph node on the left axilla, and his PPD skin test was positive. CT scan of the chest showed empyema necessitatis at the right lower chest and upper abdominal walls with osteomyelitis of the right $7^{th}$ rib. He did not have concurrent pulmonary tuberculosis. Surgery was performed for diagnosis and treatment. In histopathologic findings, chronic granulomatous inflammation with caseation necrosis was shown and was positive for acid fast bacilli stain. In addition, M. tuberculosis complex was found as etiology by polymerase chain reaction. The patient has been treated with anti-tuberculous medication without any specific complication.

초저체온 순환정지시 $\alpha$-STAT와 pH-STAT 조절법의 비교분석 -어린돼지를 이용한 실험모델에서-

김원곤,임청,문현종,원태희,김용진,Kim, Won-Gon,Lim, Cheong,Moon, Hyun-Jong,Won, Tae-Hee,Kim, Yong-Jin 대한흉부심장혈관외과학회 1998 Journal of Chest Surgery (J Chest Surg) Vol.31 No.6

서론: 초저체온 순환정지법은 일부 심장수술에서 매우 유용하게 사용되고 있다. 그러나 사람은 정상 생리상태에서 이 정도 저체온에 노출되는 적이 없기 때문에 초저체온 상태에서 $\alpha$-STAT와 pH-STAT 산-염기 조절법 중 어느 쪽을 택하는 것이 좋으냐에는 여전히 이론이 많다. 본실험에서는 어린 돼지에서 초저체온 순환정지 실험모델을 확립한뒤 pH-STAT와 $\alpha$-STAT 간에 (1) 심폐바이패스 냉각 및 재가온시 뇌냉각 및 재가온 속도 비교, (2) 뇌혈류, 뇌대사 및 뇌혈류/뇌대사 비의 변화 양상 분석, 그리고 (3) 초저체온 순환정지후 뇌부종 정도를 비교 분석하였다. 대상 및 방법: 25~30 KG의 어린 돼지를 실험군마다 7마리씩 사용하였다. 마취후 두개골을 절제하고 상시상동 삽관을 통해 뇌혈류를 측정하였다. 그리고 정중흉골절개술 및 캐뉼라 삽관후 심폐바이패스를 시행하였다. 막형 산화기와 롤러펌프를 사용하였고, 관류속도는 2500 ml/min로 유지시켰다. 심폐바이패스 시작후 첫 10~15분 동안 정상체온 관류를 시행한 뒤 이어 $20^{\circ}C$(비인두체온) 까지 관류냉각을 시행하였다. $20^{\circ}C$에서 40분 동안 완전순환정지를 시행하였다. 냉각기간 동안 실험군에 따라 $\alpha$-STAT 또는 pH-STAT에 따른 산-염기 조절을 시행하였다. 순환정지후에는 정상 체온까지 재가온하였다. 재가온 종료후 실험동물을 희생시키고 뇌를 추출하였다. 뇌혈류 및 뇌대사 측정은 바이패스전, 냉각전, 순환정지전, 재가온후 15분, 재가온 종료시, 재가온 종료후 1시간에 각각 시행하였다. 결과: 양군간 냉각시간은 $\alpha$-STAT군이 16.57$\pm$5.13분으로 pH-STAT 군의 22.83$\pm$2.14분 보다 유의하게 짧았으나(P<0.05), 재가온시간에서는 $\alpha$-STAT군(40.0$\pm$5.07분)과 pH-STAT군(46.5$\pm$6.32) 사이에 유의한 차이는 없었다. 뇌혈류 및 뇌대사에서는 pH-STAT군이 $\alpha$-STAT군에 비하여 높은 경향을 보였지만 통계학적으로 유의한 차이는 없었다. 뇌혈류량/뇌대사율의 비에서도 두군간에 차이가 없었다. 그러나 두 실험군내에서 체온변화에 따른 뇌혈류량 및 뇌대사의 차이는 유의하였다. 특히 비인두체온 20도에서는 뇌대사율의 감소가 뇌혈류의 감소 보다 더욱 커서 결과적으로 뇌혈류량/뇌대사율의 비는 1 보다 높은 수치로 기록되었다. 뇌수분양은 두 실험군간에 유의한 차이는 없었다. 결론: 본 실험에서 $\alpha$-stat와 pH-STAT 산염기 조절법간에 냉각시간 이외에는 유의한 차이가 없음을 알 수 있었다. Introduction: The most dramatic application of hypothermia in cardiac surgery is in deep hypothermic circulatory arrest(DHCA). Because man in natural circumstances is never exposed to this extreme hypothermic condition, one of the controversial aspects of clinical hypothermia is appropriate acid-base management($\alpha$-stat versus pH-stat). This study aims to compare $\alpha$-stat with pH-stat for: (1) brain cooling and re-warming speed during hypothermia induction and re-warming by cardiopulmonary bypass (CPB); (2) cerebral perfusion, metabolism, and their coupling; and (3) the extent of development of cerebral edema after circulatory arrest, in young pigs. Materials & Methods: Fourteen young pigs were assigned to one of two strategies of gas manipulation. Cerebral blood flow was measured with a cerebral venous outflow technique. After a median sternotomy, CPB was established. Core cooling was initiated and continued until nasopHaryngeal temperature fell below $20^{\circ}C$. The flow rate was set at 2,500 ml/min. Once their temperatures were below $20^{\circ}C$, the animals were subjected to DHCA for 40 mins. During cooling, acid-base balance was maintained according to either $\alpha$-STAT or pH-STAT strategies. After DHCA, the body was re-warmed to normal body temperature. The animals were then sacrificed, and their brains measured for edema. Cerebral perfusion and metabolism were measured before the onset of CPB, before cooling, before DHCA, 15 mins after re-warming, and upon completion of re-warming. Results & Conclusion: Cooling time was significantly shorter with $\alpha$-stat than with pH-stat strategy, while there were no significant differences in rewarming time between the two groups. Nosignificant differences were found in cerebral blood flow, metabolic rate, or flow/ metabolic rate ratio between two groups. Temperature-related differences were significant in cerebral blood flow, metabolic rate, and flow/metabolic rate ratio within each group. Brain water content showed no significant differences between two groups.

대한민국 흉부외과 수술자료수집을 위한 코드

박영환,성숙환,김광택,노환규,원태희,김경환,선경,송현,심영목,임청,박수정,Park, Young-Hwan,Sung, Sook-Hwan,Kim, Kwang-Taek,Rho, Hwan-Kyu,Won, Tae-Hee,Kim, Kyung-Hwan,Sun, Kyung,Song, Hyun,Shim, Young-Mok,Lim, Chung,Park, Soo-Jung 대한흉부심장혈관외과학회 2000 Journal of Chest Surgery (J Chest Surg) Vol.33 No.5