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최근 10년간 조선대학교 치과병원 소아치과에 내원한 신환에 관한 역학적 연구(1990-1999)
이창섭,류현섭,김효석,이상호 대한소아치과학회 2001 大韓小兒齒科學會誌 Vol.28 No.3
본 연구는 소아환자들의 변화하는 특성을 파악하고 이해함으로써 환자나 보호자와의 적절한 의사소통을 위한 자료나 정보 제공을 용이하게 하며 , 적절한 진단과 치료계획을 수립하는 데 도움을 주며 , 또한 국내 다른 지 역을 중심으로 한 연구와 비교 분석하여 이 지방의 소아환자의 치료의 방향성을 설정하기 위해 본 연구를 시행하였다. 이를 위해 1990년 1월 1일부터 1999년 12월 31일 까지 조선대학교 부속치과병원 소아치과에 내원한 모든 신환아동을 대상으로 하여 분포와 변화추세를 조사 연구한 결과 다음과 같은 결론을 얻었다. 1.내원환자의 수는 56년 이후 증가 추세이며, 남자가 55.9%, 여자가 44.1%로 남자가 여자보다 많은 비율을 보였다 (P>0.05) . 2. 연령별 분포에서 3∼4세 군의 내원율이 23.4%로 가장 높게 나타났으며 5∼6세 군이 19.9%, 7∼8세 군이 17.7%,0∼2세 군이 14.6%순 이었다. 3 내원환자의 거주지 분포에서 광주시내 거주자가내원환자의 83.0%로 대부분을 차지하였고,근거리 광주시외 거주자는 5.4%를 보였다 4.내원환자의 주소(chiefcomplaint)별 분포에서 충치 치료를 주소로 내원한 경우가 40.5%로 가장 많았고, 구강검진이 13.9% , 교정적 문제가 12.6%를 보였다. 5.외상을 주소로 내원한 환자중 치관 파절이 41.4%로 가장 많았고, 아탈구가 19.4%, 진탕이 12.0%. 완전탈구가 11.4% , 함입이 9.3%를 차지하였다. 6.내원동기의 분포는 의뢰되지 않은 경우가 78,7%를 차지하고, 의뢰된 경우 중 치과의원에서 의뢰된 경우가 전체의 20.5%이고,치과의원에서 의뢰된 경우 중 진료의 난이도 때문이 12.7%,행동조절의 어려움 때문이 6.2%를 나타냈다. 7. 주기적인 검사가 되는 환자가 전체환자의 19.6%를 차지하였고, 그 중 3개월 후가 36.7% , 6개월 후가 22.2% , 9개월 후가 13.5%를 나타냈다. The purpose of this study was to make public oral health plan more effective and the improvement of the hors-pital management system for better clinical dental practice. Distribution and trends were examined in all patients who had been examined and diagnosed at Department of Pedodontics, Dental Hospital, Chosun University over 10 year-period from 1990 to 1999 Results were as follows, 1.The number of patients per year was increasing trend after 1996 and higher visiting rate in male(55.9% ) than in female(44.1%). 2.Age distribution had shown 3∼4 year-old group being the largest (23.4% ) and each percentage of 5∼6, 7∼8,0∼2. 9∼10. 11∼12, 13∼14. above∼15 year-old group was 19.9%, 17.7%, 14.6% 12.6%, 8.0%, 3.3%, 0.5%. 3.Geographic distribution showed a majority of patients in Kwang-Ju (83.0%) . Group in the suburbs of Kwang-Ju (Jang-Sung group) was 5.4%. 4.Dental caries showed the highest percentage(40.5%) in chief complaints and percentage of oral exam, orthodontic problem, oral pain, trauma. supernumerary teeth, swelling was 13.9%, 12.6% . 8.8%. 7.4% , 5.5%,4.9% 5.In all patients with traumatic problem, crown fracture showed the highest percentage(41.4%) and percentage of subluxation was 19.4%. 6 Majority(78.7% ) of patients were not refired, and percentage of patients refered from local clinic was 20.5%. 7 Patients who had periodic check-up comprised 19.6% , and percentage of after 3, 6, 9. 12, 18,24month was 36.7%,22.2%, 13.5%, 11.3%,5.4%, 11.0%.
Enamel matrix derivative(EMDOGAIN^(R))을 이용한 상악 소구치의 자가이식 치험례
오유향,김효식,정현구,조태식,위유민,이창섭 조선대학교 구강생물학연구소 2002 Oral Biology Research (Oral Biol Res) Vol.26 No.2
The success of tooth transplantation or replantation depends on the viability of periodontal ligament in the transplanted tooth. Mechanical injury to periodontal tissues frequently results in dental root resorption and ankylosis, which leads to the failure of transplantation or replantation. Enamel matrix derivative (EMD) has been recently used to induce periodontal regeneration. In this report, we show a clinical case of EMD application in the transplantation of an inversely impacted and immature tooth. An impacted second premolar was found in the right maxilla of a 14 year-old girl. The tooth was inversely impacted and the root formation was incomplete. When transplantation was carried out. EMD was applied to the periodontal tissues of the extracted premolar. The tooth was fixed at the correct position and the clinical condition was followed for evaluation for 3 months. Radiographs after 3 months exhibited new bone formation surrounding the transplanted tooth. There were no signs of root resorption or ankylosis, and reconstruction of the bone defect area at the maxilla was also found. Short-term results from this case indicated that EMD application was effective in the transplantation of an inversely impacted and immature tooth. In adddition, EMD might contribute to obtain good healing without ankylosis. Further follow-up observations are necessary to evaluate the regenerative effects of EMD.
Indirect short resin post Crown을 이용한 유전치부 심미수복
이상호,한국재,김효석,이창섭 大韓小兒齒科學會 1998 大韓小兒齒科學會誌 Vol.25 No.3
Children who have severely destructive anterior primary dentition, as in nursing bottle caries, in trauma, in rampant caries and in developmental defects. present the dentist with one of the most perplexing situations in dentistry. Especially. children with managed behaver difficultly is very severly situations. This paper reported a new technique for the utilization of resin post and strip crown to indirect methods on severely destructive primary anterior teeth. We name it "indirect short resin post crown" in this paper. Indurect technique be considered to be a simple, a retentive, retentive, intensive, color-stable and esthetic restoration.
초기우식병소에 대한 레이저 fluorescence 의 광학적 탐지감도
이상호,이창섭,김왕근,김효석 大韓小兒齒科學會 1999 大韓小兒齒科學會誌 Vol.26 No.1
The aim of this study was to evaluate the optical density of laser fluorescence for detection of incipient caries. Prepared and polished bovine enamel specimens were demineralized in a STPP solution for varying periods of time between 3 hrs. and 60 hrs. with an area of sound enamel retained on each specimen. The randomized specimens were analyzed for optical density of enamel deminaralization using laser fluorescence. The specimens were sectioned and examined lesion depth by posarizing light microscope. Results were analyzed statistically with SAS program. The results from this study can be summarized as follows: 1. Optical density measured by laser fluorescence and lesion depth measured by polarizing light microscope was increased as demineralization time was increased(p<0.001). 2. Between optical density measured by laser fluorescence and lesion depth measured by polarizing light microscope was correlated highly(γ≥0.74956, p<0.001). 3. Regressive equation was obtained in this study as follows. Y=[X-0.260851]/ 0.000271 (R-square : 0.5618, p<0.001) (X: DENSITY, Y: DEPTH) In summary, optical density measured by laser fluorescence would be within the range of possibility to quantitatively presume demineralization amount of incipient caries lesion.
김병호,김효종,정인경,장린,이정일,동석호,장영운,김광국,황일섭,김윤화 대한소화기내시경학회 1999 Clinical Endoscopy Vol.19 No.1
Although intestinal bleeding is known to occur in amyloidosis, it is rare as a presenting symptom or sole manifestation of the disease. We experienced a case of intestinal hemor-rhage in a 64-year old female patient with primary amyloidosis, kappa type. Antral muco-sal erosions were discovered and one shallow healing ulcer at the angle. Colonoscopy revealed multiple purplish nodules in the sigmoid colon and descending colon, as well as a large shallow ulcer with blood clots in the sigmoid colon which was suspected to be the intestinal hemorrhage site. Endoscopic biopsy established amyloidosis. Polarizing microscopy after Congo red staining and immunohistochemical staining identified primary amyloid, kappa type. A case of intestinal hemorrhage in patients with primary amyloidosis is presented and the literature is reviewed.
Application of Polar Anisotropic NdFeB Ring-Type Permanent Magnet to Brushless DC Motor
Hyo Jun Kim,Dong Hwan Kim,Chang Seop Koh,Pan Seok Shin IEEE 2007 IEEE transactions on magnetics Vol.43 No.6
<P>A four-pole polar anisotropic sintered NdFeB permanent magnet (PM) with high surface magnetic flux density is developed using a dry pressing process with pulse magnetizing fields. The effects of powder-filling density, magnetic field intensity, distribution in the cavity, and premagnetization of the powder on the magnet performance are investigated. Through an application of the developed PM to a brushless DC motor, it is shown that the premagnetization of the powder is very effective for increasing the surface magnetic flux density. Experimental results with a brushless DC motor adopting the developed PM shows that the surface magnetic flux density is increased up to 0.63 T, and the back emf at 1000 rpm measured 2.7 V, which is 41% higher than the conventional segment type PM</P>