수종의 NiTi 전동 파일 단면 형태 비교 및 pecking motion의 사용방법이 피로 파절에 미치는 영향

김재관,금기연,김의성 大韓齒科保存學會 2006 Restorative Dentistry & Endodontics Vol.31 No.2

본 연구는 현재 시판중인 Profile^(®), ProTaper^(®), K3^(®), Hero 642^(®), Hero Shaper^(®)를 단면을 비교하고 이들 5가지 NiTi 파일과 사용방법에 따른 피로 파절 소요 시간을 비교하고자 시행되었다. 각 NiTi 전동파일의 치근단 1/3을 temporary resin에 매몰시키고 다이아몬드 표면처리된 버로 잘라내어, 초음파를 이용하여 세척 후, 주사전자현미경으로 단면을 관찰하였다. 주기적인 피로 실험을 수행하기 위해, 회전속도, pecking 거리를 자동적으로 조절할 수 있는 장치를 제작하고 파일을 만곡된 상태를 재현하기 위하여 15도 경사진 금속 토막에 위치시키고 분당 300회전의 속도로 회전시켜 파일이 파절될 때까지의 시간을 측정하였다. 사용방법에 따른 실험군은 동적군과 정적군으로 나누고 pecking 거리는 3㎜, 6㎜로 하였다. 실험결과 동적군 보다는 정적군의 피로파절 소요시간이 통계학적으로 유의차 있게 짧았으며 3㎜, 6㎜의 pecking distance에 따른 영향은 나타나지 않았다. 결론적으로 NiTi전동파일은 pecking motion으로 사용하는 것이 피로파절을 줄이는데 도움이 될 것으로 사료된다. There are various factors affecting the fracture of NiTi rotary files. This study was performed to evaluate the effect of cross sectional area, pecking motion and pecking distance on the cyclic fatigue fracture of different NiTi files. Five different NiTi files-Profile^(®) (Maillefer, Ballaigue, Switzerland), ProTaper™ (Maillefer, Ballaigue, Switzerland), K3 ^(®) (SybronEndo, Orange, CA), Hero 642^(®) (Micro-mega, Besancon, France). Hero Shaper^(®) (Micro-mega, Besancon, France)-were used. Each file was embedded in temporary resin, sectioned horizontally and observed with scanning electron microscope. The ratio of cross-sectional area to the circumscribed circle was calculated. Special device was favricated to simulate the cyclic fatigue fracture of NiTi file in the curved canal,. On this device, NiTi files were rotated (300rpm) with different pecking distances (3㎜ or 6㎜) and with different motions (static motion or dynamic pecking motion). Time until fracture occurs was measured. The results demonstrated that cross-sectional area didn't have any effect on the time of file fracture. Among the files, Profile^(®) took the longest time to be fractured. Between the pecking motions, dynamic motion took the longer time to be fractured than static motion. There was no significant difference between the pecking distances with dynamic motion, however with static motion, the longer time was taken at 3㎜ distance. In this study, we could suggest that dynamic pecking motion would lengthen the time for NiTi file to be fractured from cyclic fatigue.

하악 무치악 인공치아매식술시 하치조신경 전위술

최의환,하정완,김수관,정태영,김수흥 대한악안면성형재건외과학회 2001 Maxillofacial Plastic Reconstructive Surgery Vol.23 No.3

Modified surgical technique for transposition of the inferior alveolar nerve followed by immediate placement of endosseous implants in mandibles with moderate to severe atrophy are presented. Five transpositions of the inferior alveolar nerve together with the installation of 10 implants were performed in four patients. The mean postoperative follow-up time was 17 months, with a range of 8 to 20 months. All implants with functioning pontics remained stable, with no mobility or symptoms of pain and infection during the follow-up period. Neurosensory evaluation was performed using the two-point discrimination test. Two patients had objective neurosensory dysfunction at postoperative, but all the nerve function were reported as normal by the patients 4 months postoperatively.

Aloe, Gelfoam, Plaster가 골격손부의 신생골 형성에 미치는 영향에 관한 실험적 연구

최의환,김수관 大韓口腔顎顔面 放射線學會 1999 Imaging Science in Dentistry Vol.29 No.2

Purpose : This study was to evaluate the effects of Aloe, Gelfoam, and Plaster of Paris on bone healing. Materials and Methods : Four experimental defects were created for placement of the three materials in the right femur of dogs. One defect served as an empty control site. The evaluation was performed at 1-, 6-, and 12-weeks by light microscopy and radiographs. Results: Radiographic and histologic examinations showed new bone formation in the presence of Aloe, Gelfoam, and Plaster of Paris and similar bone healing reactions. Conclusion: On the basis of these findings, it was concluded that Aloe, Gelfoam, and Plaster of Paris may be adequate agents for use in bone procurement.(J Korean Oral Maxillofac Radiol 1999;29:493-506)

자궁 경부 도말표본에서 Chlamydia trachomatis의 양성율에 대한 연구

홍기언,김의한,김민관,양승하,강상균 순천향의학연구소 1995 Journal of Soonchunhyang Medical Science Vol.1 No.1

The uterine cervicitis by chlamydia trachomatis(CT) shows no specific clinical symptoms except mucopurulent leukorrhea, but it causes severe complications such as endometritis, salpingitis, abortion and infertility. Fortunately, the treatment of cervicitis by CT is simple and effective, so that this infection is once diagnosed and then confirmed, the treatment is not difficult. To study the positive rate of CT infection, we collected 65 patients inflicted with mucopurulent leukorrhea in Chonan city. Specimen was collected by swab and for the detection of CT, ELISA was carried out. The positive cases are observed in 15 out of 65 patients (positive rate is 23.1%). This positive rate was rather lower than other reports, however, this results were higher we expected With this result, the clinicians keep in mind the fact that the causes of uterine cervicitis by CT occupy the large proportions as gonorrhea.

山林의 公益的 機能 平價에 관한 考察

麻鎬燮,孫英模,金義庚,鄭永觀 慶尙大學校 1990 論文集 Vol.29 No.1

This study was carried out to estimate and evaluate the public function of forest resoruces, such as soil runoff control, landslide control, head-wsater conservation. purification of air (O? production and CO? purification ), sanitary andoutdoor recreation andwildlife protection for the forest land of 6.500.000 ha in Korea. The results obtaiend were as follows; 1 The function of soil runoff control was estimated to b e1.970million m?.its monetary value was appraised at 3.814.5 billion wons. 2.The function of landslide control was estimated to be 37.876 thousand m?its monetary value was appraised at 73.3 billion wons. 3. The function of head-water conservation was estimated to be 25.507million tons, its monetary value was appraised at 3.571.0 billion wons. 4.The production fo O? in the forest land was estimated to be 78.600 thousand tons,its monetary value was appraised at 3.930.0billion wons. 5.The volume of CO? absorbed in the forest land was estimated to be 94.320 thousand tons,its monetary value appraised at 2.204.3 billion wons. 6.The monetary value of outdoor recreation was appraised at 1.162.5 billion wons. 7.The phytoncide emmited in the forest land was estimated to be 1.954 thousand tons,the function of forest bath using phytoncide was appraised at 1.953.9 billion wons. 8.The monetary value of the functions of wildife protection, control of harmful insect control of tree growth and loss control of timber qality was appraised at 327 1 billion wons. In conclusion, the value of public functions of forest is more 23 times than that of the econmic function. production value of forest products, and comes to 14% of GNP. And also, the function of air purification.and and soil conservation has value than those of others. Particulary, it takes a more great deal of effort achiving the various works such as erosion control, establishment of recreation forest. management of reserved natural forest and afforestation of street tree for increasing of public functions.

일측성 질폐쇄 및 동측 신장 무발생을 동반한 중복자궁 2예

윤일영,여소진,김형문,김정식,김태희,이해혁,남계현,이권해,김준모,김민의 순천향의학연구소 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2

Uterus didelphys with unilateral obstructed hemivagina and ipsilateral renal agenesis usually presents after menarch with progressive abdominal pain during menses secondary to hematocolpos, and indeed a very rare congenital anomaly due to Mullerian duct malformation. An accurate and prompt diagnosis is of importance to permit treatment and to assure the future fertility of the patient. Pelvic ultrasound, physical examination and pelvic MRI established a diagnosis of hematometracolpos secondary to uterus didelphys with unilateral imperforate hemivagina. An incision in the vaginal septum allowed drainage of the hematocolpos, providing relief of the patients symptoms. We report two case of uterus didelphys with obstructed hemivagina with brief review of the literature.

중부지역 뿌리부추 하우스 재배 시 차광 정도가 생육 및 수량에 미치는 영향

박의광(Eui-Kwang Park),노재관(Jae-Gwan Noh),이민정(Min-Jeong Lee),남상영(Sang-Young Nam),홍의연(Eui-Yon Hong),이철희(Cheol-Hee Lee) (사)한국생물환경조절학회 2016 생물환경조절학회지 Vol.25 No.4

본 연구는 뿌리부추를 시설하우스에서 재배할 경우 여름철 고온기 하고현상(Summer depression)을 방지하기 위하여 차광막을 하우스 내부 또는 외부에 설치하여 차광정도를 달리하면서 생육 및 수량에 미치는 영향을 조사하기 위하여 수행되었다. 2015년 하우스 내부에 무차광, 35, 55, 75, 95% 차광막을 설치하여 정식 후 20일째 되는 날에 최종 출현 정도를 조사한 결과, 무처리, 35 및 75% 차광에서 98% 출현하였고, 55 및 95% 차광에서 100% 출현하였다. 차광 정도와는 상관없이 모든 처리에서 최종 출현은 양호하였다. 하우스 내외부에 차광막을 설치했을 경우, 2년간 평균 생중량(Fresh weight)은 75% 차광에서 6,323kg/10a으로, 무차광, 35%, 55%, 95% 차광보다 각각 5.0배, 1.8배, 1.1배, 1.7배 높았다. 하우스 외부에 차광막을 설치할 경우 생중량은 75% 차광에서 684g으로, 55%, 95% 차광보다 1.1배, 1.8배 높았다. 건중량(Dry weight), 건물율(Percentage of dry matter), 엽수(No. of leaves), 분얼수(No. of branches), 초장(Plant height), 근장(Root length) 등 분석결과 75% 차광이 다른 차광 보다 통계적으로 유의하게 높거나 절대적 수치가 높게 측정되어 중부지역에서 뿌리부추를 재배 할 경우에는 75% 차광이 가장 적합한 것으로 판단되었다. Allium hookeri is used for food and medical materials in Asia. This study was carried out to elucidate the effects of shading rates on growth and quality of A. hookeri cultivation in greenhouse. Treatments were given with 35%, 55%, 75% and 95% shading rates and non-shading (Control). Photosynthesis photon flux density (PPFD) of control, 35%, 55%, 75%, and 95% shading were 792, 515, 351, 182, and 78.2μ㏖·m·s<SUP>-1</SUP> respectively. The emergence ratio was 98% under non-shading, 35% and 75% shading condition, and it was 100% under 55% and 95% shading condition on April 20, 2016. These results showed no correlation between emergence rate and shading treatment. When shading net was set up inside at greenhouse, fresh weights in control, 35%, 55%, 75%, and 95% shading treatments were 1,142, 3,511, 5,936, 6,408 and 3,779㎏/10a, respectively. When shading net was set up outside at greenhouse, fresh weights in control, 55%, 75%, and 95% shading treatments were 1,372, 5,442, 6,238 and 3,595㎏/10a, respectively. Dry weight, percentage of dry matter, number of leavesand branches, plant height and root length in 75% shading treatment were higher than other shading treatments. From these results, we suggested that the proper shading rate in a greenhouse is 75% for A. hookeri cultivation in middle area of Korea.

시설하우스 풋고추 재배시 육묘기간이 품질 및 수량에 미치는 영향

박의광(Eui Kwang Park),노재관(Jae Gwan Noh),이민정(Min Jeong Lee),남상영(Sang Young Nam),홍의연(Eui Yon Hong) 한국원예학회 2016 한국원예학회 학술발표요지 Vol.2016 No.10

u-City 개방형 협업 소프트웨어 플랫폼 기술

황의관(Eui-Gwan Hwang) 한국정보과학회 2008 정보과학회지 Vol.26 No.8

딸기 단동비닐하우스 패키지기술 이용 에너지 절감 효과

노재관(Jae Gwan Noh),박의광(Eui Kwang Park),이민정(Min Jeong Lee),남상영(Sang Yeong Nam),홍의연(Eui Yon Hong),전희(Chun Chun) 한국원예학회 2017 한국원예학회 학술발표요지 Vol.2017 No.5