2종 전자근관장측정기의 일관성에 관한 in vitro 연구

황규용,노병덕,김의성,이승종 大韓齒科保存學會 2008 Restorative Dentistry & Endodontics Vol.33 No.1

정확한 근관장 측정은 성공적인 근관치료를 위해 필수적이다. Kuttler는 근관협착부는 주근단공에서 0.5 mm 상방에 위치한다고 하였고 Lee는 상아백악질경계점부위보다 주근단공이 재현성이 높고 임상적으로 관찰하기 용이하다고 보고하였다. 본 연구는 alginate model상에서 2개의 전자근관장측정기를 사용하여 얻은 측정치의 정확성(accuracy)을 평가하고 각각 0.5 mark와 Apex mark중에서 어느 지점에서 더 일관성(consistency)을 보이는지를 비교하고 또한 근관장을 측정할 때 파일을 전진시키면서 Apex mark를 측정한 값과 치근단부위를 지나친 후 다시 후퇴하면서 측정한 값의 차이를 비교하고자 하였다. 52개의 발거된 건전한 제 1, 2소구치를 대상으로 하였으며 Root ZX와 E-Magic Finder Deluxe를 이용하여 각각 26개중 13개는 파일을 전진하면서 0.5 mark에서 근관장을 측정하고 Apex mark에서 근관장을 측정한 후 0.5 mark에서 고정하였다. 나머지 13개는 0.5 mark에서 근관장을 측정한 후 Apex mark에서 근관장을 측정하고 다시 치근단 부위를 넘어선 후 후퇴하면서 Apex mark에서 근관장을 측정하고 고정한 후 치근단부 4 mm를 삭제하여 현미경상에서 파일 끝부터 주근단공까지의 거리를 측정하였다. 그 결과 Root ZX와 E-Magic Finder 모두, 실험군 100%에서 주근단공과 file tip간의 거리가 임상적 허용범위인 ± 0.5 mm 내에 있었으며 0.5 mark보다 Apex mark에서 더 높은 일관성을 보였다. 주근단공에서 file tip 사이의 거리는 Root ZX의 0.5 mark에서 -0.18 mm, Apex mark에서 -0.07 mm 이고 E-Magic Finder의 0.5 mark에서 -0.25 mm, Apex mark에서 -0.02 mm를 나타내었다. Apex band는 0.04 mm였다. 따라서 Alginate model을 사용한 본 실험조건에서는 Apex mark에서 근관장을 측정한 결과 거의 주근단공과 일치하고 다른 여러 연구에서 주근단공에서 0.5 mm 상방에 근관협착부가 위치한다고 보고하였으므로 임상적인 측면에서 Apex mark에서 측정한 근관장에서 0.5 mm 를 빼서 근관장으로 사용하는 것이 임상적으로 더 좋으리라고 사료된다. The purpose of this study was to evaluate the consistency of two electronic apex locators in vitro model. Materials consisted of fifty two extracted premolars and two electronic apex locators: Root ZX (J.Morita. Osaka, Japan) and E-Magic Finder Deluxe (S-Denti, Cheonan, Korea). After access preparation, the teeth were embedded in a saline-mixed alginate model. Canal lengths of each tooth were measured at "0.5" and "Apex" mark of the apex locators, respectively so that each tooth had two measurements from 0.5 and Apex points. The file was fixed at final measurement using a glass ionomer cement. The apical 4 mm from the apex was exposed to measure the distance from the file tip to the major apical foramen of each tooth. Average distances and standard deviations were used to evaluate the consistency. Results showed that all measurements of both Root ZX and E-Magic Finder located the major foramen the range of ± 0.5 mm level. Both apex locators showed better consistency at Apex mark than at 0.5 mark. The average distance of file tip-major foramen was - 0.18 mm at 0.5 mark and - 0.07 mm at Apex mark in Root ZX, - 0.25 mm at 0.5 mark and - 0.02 mm at Apex mark in E-Magic Finder. Standard deviation was 0.21 at 0.5 mark and 0.12 at Apex mark in Root ZX, 0.12 at 0.5 mark and 0.09 at Apex mark in E-Magic Finder.

위선암에서 p53, MMP-2 및 TIMP-2의 표출

황호현,김의한,오미혜,조현득,양승하 순천향대학교 교수학습개발센터 2004 Journal of Soonchunhyang Medical Science Vol.10 No.3

Gastric adenocarcinoma is the most common malignant tumor in Korea. Many oncogens have been found in malignant tumor cells. Among these oncogene, MMP-2 and TIMP-2 show important role in invasivness and metastasis of malignant tumor cells. P53 is regulator of cellular proliferation, and the over expression of p53 relate to malignant transformation and prognosis. To evaluate the expression of MMP-2, TIMP-2, and p53 according to histopathologic features and the relation between these antigens and prognosis in gastric adenocarcinoma, we have performed immune staining, using mouse anti-MMP-2, mouse anti-p53, and mouse anti-TIMP-2 for 91 cases. The results were as follows; 1) The expression rates of MMP-2, TIMP-2, and p53 in gastric adenocacinoma were 58.2%, 57.1%, and 49.5%, respectively. 2) MMP-2 and TIMP-2 in gastric adenocarcinoma showed reverse correlation.(p<0.001) 3) MMP-2 showed more higher expression rates in intesinal type and sell differentiated form of gastric adenocarcinoma, and in cases showing more deeper invasion and metastasis to lymph nodes in advanced carcinoma. 4) TIMP-2 in advanced carcinoma showed more lower expression rates in cases showing more deeper invasion and metastasis to lymph nodes. 5) MMP-2 expression and TIMP-2 non-expression showed more higher frequency in intestinal type of gastric adenocarcinoma and in cases showing more deeper invasion depth in advanced carcinoma. 6) p53 in advanced carcinoma showed more higher expression rates in cases more deeper invasion and metastasis to lymph nodes. Above results indicated that MMP-2 and TIMP-2 in gastric adenocarcinoma shows reverse correlation, and may be show reverse relation according to progression, type, invasion depth, and metastasis to lymph node. The expression of p53 may be related to metastasis to lymph nodes and degree of depth in advanced carcinoma.

충남 서북부지역의 개발 잠재력 분석 : 아산시를 중심으로

배성의,박동진,윤준상,황인극,최승철 공주대학교산업개발연구소 2000 産業開發硏究 Vol.8 No.-

This study was purpose for develop potential analysis of Chungnam north-west area and propose to regional development strategy. To arrived at a result for develop direction of Chungnam north-west area, Asan city will be development of central city for Asan bay, new indusrial city, tourist industrial city and ecological city.

측두하악관절조영술을 이용한 측두하악관절장애의 임상적 연구

이상래,황의환,이승현 大韓口腔顎顔面 放射線學會 1998 Imaging Science in Dentistry Vol.28 No.1

The purpose of this study was to prove the relationship between arthrographic and clinical features in temporomandibular joint disorders. In order to carry out this study, ninety-eight arthrographic examinations of temporomandibular joints were performed on eighty-two patients who had the temporomandibular joint disorders. As the arthrographic examination, the cases were classified in three groups, disk displacement with reduction, disk displacement without reduction, within normal limit. After this, the cases were clinically examined, and the results were compared and analyzed in each other group. The obtained results were as follows: 1. As the classification by arthrographic examination, three groups(disc displacement with reduction, disc displacement without reduction, within normal limit)were 41%, 54%, 5% of total cases in this study, respectively. 2. The third decade(65%) was most frequent in this study. The average age of each group(disc displacement with reduction, disc displacement without reduction, within normal limit) was 24, 28, 21, and disc displacement without reduction group was higher than any other group. 3. In the chief complaint, pain was the most frequent in all three groups. Joint sound was also frequent in disc displacement with reduction group, but in disc displacement without reduction group, limitation of mouth opening was more frequent. 4. Of the various pain, the movement pain was most frequent(61%) in this study. In joint sound, click(63%) was the most frequent in disc displacement with reduction group, but sound history(42%) and no sound(31%) were more frequent in disc displacement without reduction group. 5. The average maximum opening of each group (disc displacement with reduction, disc displacement without reduction, within normal limit) was 44mm, 32.9mm, 44mm, and disc displacement without reduction group was less than any other group. 6. The masticatory disturbance of each group (disc displacement with reduction, disc displacement without reduction, within normal limit) was 53%, 79%, 40%, and the trauma history of each group was 50%, 40%, 60%.

급성 포름알데히드 가스 흡입에 의한 흰쥐 후각상피의 형태학적 변화

백선용,전재기,문용석,황승영,노환중,고의경,왕수건 대한해부학회 1998 Anatomy & Cell Biology Vol.31 No.3

서울의 Penicillinase Producing Neisseria gonorrhoeae 발생빈도(1998)

김재홍,김준호,반재용,이정우,황성주,정준규,정성태,강진문,조흔정,홍창의,정혜신,이한승,김이선,이봉길,이종호,선영우,한기덕,윤성필,이성훈,안종성,박석범,문승현,조항래,김형섭,류지호,황재영,박준홍,손상욱 한양대학교 의과대학 2001 한양의대 학술지 Vol.21 No.1

In recent years, gonorrhea has been pandemic and remains one of the most common STDs in the world, especially in developing countries. For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria gonorrhoeae(PPNG), we have been trying to study the patients who have visited the Venereal Disease Clinic of Choong-Ku Public Health Center in Seoul since 1980 by menas of the chromogenic cephalosporin method. In 1998, 93 strians of N. genorrhoeae were isolated, among which 60(64.5%) were PPNG. The prevalence of PPNG in Seoul, which had been decreased to 39% in 1996 after a peak of 74.3% in 1993, is increased to 64.5% in 1998.

DYNAMIC BEHAVIOR OF BRIDGES DUE TO MOVING TRUCK

Eui Seung Hwang,Sung Pil Chang,Jeong In Suh,Young Hwan Park 한국강구조학회 1992 韓國鋼構造學會誌 Vol.4 No.3

Dynamic behavior of the bridge is one of the most important aspects in bridge analysis and design. Bridges vibrate mainly due to moving vehicle, wind or earthquake. This study deals with the dynamic behavior of bridges due to moving vehicle. Of the several types of vehicles running on the bridge, trucks are considered in this study. In the design, the effect of moving truck is included as the dynamic or impact load. From many analytical studies and actual measurements, it has been recognized that the dynamic behavior of bridges due to moving truck is affected by dynamic characteristics of the bridge and truck and surface roughness. The purpose of this study is to analyze the dynamic behavior of bridge due to moving truck using the actual model of trucks, bridges and surface roughness. Truck model representing 5 axle semi tractor-trailer, is composed of masses and springs. A multi-leaf type springs which show nonlinear hysteretic behavior are used for truck suspension systems. Vertical displacements and pitching rotations are considered for truck body masses. Bridges are modeled by the finite element method using three-dimensional frame elements. Surface roughness is considered as a vertical deviation from the reference line connecting the bridge entrance and exit. Road profiles representing vertical deviation are generated using inverse Fourier transform of measured power spectral density function. A computer program is developed to analyze the dynamic interaction between the bridge and the truck. It solves the equations of motion from truck and bridge models. To find the maximum dynamic response, direct integration scheme is used. Three bridges are selected in the analysis : one-dimensional simple span bridge, two-dimensional (grid) simple span bridge and one-dimensional two span continuous bridge. From the analysis, the dynamic load factors are calculated from maximum static and dynamic response. The dynamic load factors of each girder are compared for various transverse truck positions. Effects of truck weight and speed are examined. Results also are compared with the case when the truck is assumed as constant forces.

VERTICAL OZONE DENSITY PROFILING BY UV RADIOMETER ONBOARD KSR-III

Hwang Seung-Hyun,Kim Jhoon,Lee Soo-Jin,Kim Kwang-Soo,Ji Ki-Man,Shin Myung-Ho,Chung Eui-Seung 한국우주과학회 2004 한국우주과학회보 Vol.13 No.2

KP Index at the Initiation of Dialysis for Patients with End-stage Renal Disease

( Eui Won Hwang ),( Suk Bae Ji ),( Jin Kuk Kim ),( Seung Duk Hwang ) 대한내과학회 2004 The Korean Journal of Internal Medicine Vol.19 No.2

Bowel Injury and Insidious Pneumoperitoneum after Lateral Lumbar Interbody Fusion

Hwang Eui Seung,Kim Kook Jong,이춘성,Lee Mi Young,Yoon So Jung,Park Jae Woo,Cho Jae Hwan,Lee Dong-Ho 대한척추외과학회 2022 Asian Spine Journal Vol.16 No.4

Study Design: Retrospective review of prospectively collected cases. Purpose: To report bowel injury cases and determine the incidence and risk factors of insidious pneumoperitoneum after lateral lumbar interbody fusion (LLIF). Overview of Literature: Minimally invasive LLIF is considered a safe surgical approach with a low risk of complications. Visceral injury after LLIF is rare and, to our knowledge, no studies on pneumoperitoneum after LLIF have been performed. Bowel injury is a catastrophic complication, but the clinical signs may not be apparent. After we encountered two cases of bowel injury after LLIF, we decided to perform computed tomography of the abdomen and pelvis (APCT) after surgery for all patients who underwent LLIF. Methods: A total of 90 patients underwent APCT within 48 hours of surgery. Medical records were reviewed to determine each patient’s age, sex, body mass index, medical and surgical histories, characteristics of LLIF procedures, and subjective symptoms and abnormal findings in the physical examination related to acute abdomen after surgery. Various parameters were compared between patients with and without pneumoperitoneum. Results: Bowel injuries were identified in the first two patients and five patients (5.5%) were diagnosed with pneumoperitoneum only on APCT. We found that the greater the number of fused segments, the higher the incidence of postoperative bowel injury and/or pneumoperitoneum. The incidence was significantly high when the L2–3 level was included in the LLIF surgery. Conclusions: Pneumoperitoneum after LLIF indicates damage to the peritoneum and the presence of bowel injury that may lead to peritonitis. However, it is difficult to distinguish pneumoperitoneum and/or bowel injury from general abdominal pain after surgery because patients may present with a wide range of symptoms. We recommend that APCT be routinely performed after LLIF surgery in order to promptly identify pneumoperitoneum and bowel injury.