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영유아기 과잉치의 임상적 처치 및 micro-computed tomography 분석: 증례 보고
나채현,이한아,김한성,김지훈 대한소아치과학회 2022 大韓小兒齒科學會誌 Vol.49 No.3
Supernumerary teeth develop from excessive proliferation and development of the dental lamina. Supernumerary teeth can cause several problems, including ectopic eruption, delayed eruption, root resorption of adjacent teeth, and diastema. Supernumerary teeth in infancy are rare and have rarely been reported. Case of a 2-day-old infant with 3 supernumerary teeth is presented here and the patient was followed up for 21 months. The erupted supernumerary tooth in the primary dentition was extracted under moderate sedation at the age of 14 months. Microcomputed tomography analysis of the extracted tooth confirmed microscopic root malformation. After extraction, the midline diastema was reduced and oral hygiene improved. Early diagnosis and prompt treatment can prevent complications of supernumerary teeth.
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원주세브란스기독병원의 선천성 영구치 치아결손에 관한 연구
나채현,김지훈,Chaehyun Na,Jihun Kim 대한소아치과학회 2023 大韓小兒齒科學會誌 Vol.50 No.1
Congenitally missing teeth are one of the most prevalent dental anomalies in the oral cavity. In this study, the prevalence, distribution, and symmetry of congenitally missing permanent teeth among 1,865 patients aged 7 to 15 years who visited the Pediatric Dentistry Department of Wonju Severance Christian Hospital from March 2011 to May 2021 and took panoramic radiographs were investigated and analyzed. Most of the patients had one or two congenitally missing teeth, mainly in the second premolars and lateral incisors. Congenitally missing teeth occurred more in the mandible than in the maxilla, and there was no significant difference in prevalence between the left and right sides. Congenitally missing teeth tend to occur symmetrically on the left and right sides and in the maxilla and mandible, depending on the tooth. Early oral examination and radiological examination are required to prevent complications due to congenitally missing teeth, and appropriate interdisciplinary treatment is required.
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김지현,나채현,Dong-hyub Lee,Nicholas M. Becker,조무현,남궁원 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.6
It is well known that a plasma produces a transient ion-matrix sheath when a sudden negative step bias is applied to a grid-shaped electrode. During this sheath forming process, ions are expected to be rushing to the grid electrode. Due to the grid structure, rushing ions are trapped and oscillate in the negative potential well formed around the grid. As soon as the bias is removed from the grid, ions propagate with a ballistic mode, forming a pseudowave. In this research, we studied the characteristics of the trapped ion motion by using the XOOPIC plasma particle simulation program. The energy distribution of ions and their dependence on the negative pulse shape and grid spacing, together with transient sheath expansion phenomena, were studied. We observed that the voltage rise time of the pulse did not affect the pseudowave properties. On the other hand, the pulse fall time was crucial to the pseudowave characteristics because ions escaping from the sheath were decelerated during the fall time. Grid spacing and the pulse width effects were also considered.
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지태영,나채현,정현서,한주형,한경미,황활수,이경열 한국응용곤충학회 2017 한국응용곤충학회 학술대회논문집 Vol.2017 No.10
기생벌은 전세계적으로 10만종이상 존재하며 중요한 천적자원으로 간주된다. 진딧물과 기생벌의 상호관계를이해하기 위하여 유전자 분석을 통한 종 동정 및 유연관계를 비교했다. 학교에 서식하는 음나무 및 참쑥에서 진딧물및 머미를 채집했다. 머미는 플라스틱 상자에 넣은 뒤에 우화하는 기생벌을 확보했다. 현미경으로 세부형태를관찰했다. 또한, DNA를 추출하여 PCR법으로서 cytochrome oxidase subunit I의 염기서열을 결정하였다. 음나무에서채집한 것은 목화진딧물(Aphis gossypii)이었고 기생벌은 Lysiphlebia japonica와 97% 유사했다. 참쑥에서 채집한 것은쑥꼬마수염진딧물(Macrosiphoniella yomogifoliae)이었고 기생벌은 Alloxysta sp.와 96% 유사했다. 기생벌 두 종이 모두3-4% 염기서열 차이를 나타내어서 정확한 종동정을 위하여 형태진단이 필요하다. 또한, Alloxysta 속의 기생벌은중기생(hyperparasitoid) 특징이 있어서 복잡한 상호관계를 이룬다고 판단된다.
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빅데이터를 이용한 치면열구전색 급여화 이후의 소아청소년 치면열구전색 환자에 대한 분석
이한길,손동현,나채현,김지훈,Lee, Hangil,Son, Donghyun,Na, Chaehyun,Kim Jihun 대한소아치과학회 2021 大韓小兒齒科學會誌 Vol.48 No.2
이 연구의 목적은 치면열구전색의 급여화 이후 치면열구전색 처치를 받은 소아청소년 환자들의 성별, 나이, 보험종류, 지역, 의료기관 등의 특성을 알아보는 것이다. 건강보험심사평가원의 환자표본자료를 이용하였으며 2010년부터 2017년까지 총 8,454,636명의 환자의 정보를 얻을 수 있었고 이중 치면열구전색 처치가 포함된 환자는 114,680명이었다. 여자에서 남자보다 치면열구전색 처치를 받은 비율이 더 높았고, 5 - 9세 집단이 다른 연령에 비하여 가장 많은 치면열구전색 환자 및 진료 비율을 보였다. 보험의 경우 건강보험을 가진 경우가 의료급여에 해당하는 환자에 비해 치면열구전색 진료를 받은 비율이 높았고 진료기관은 치과의원, 치과병원, 보건소 순으로 나타났다. 지역별 비교에서는 경기도가 가장 많은 치면열구전색 환자를 보였으나, 환자 비율의 경우 전북이 가장 높게 나타났다. The purpose of this study was to analyze the characteristics of pediatric and adolescent patients who received sealant after health insurance coverage based on demographic factors such as gender, age, insurance type, care institution and region. Patient Sample Data from the Health Insurance Review and Assessment Service were used for this study. A total of 8,454,636 patients' data were obtained from 2010 to 2017. Of these, 114,680 patients got sealant treatment. Females were more likely to receive sealant treatment than males. 5 - 9 year age group showed the highest number of patients and proportion of treatment. Patients with health insurance were more likely to receive pit and fissure sealant treatment compared to patients with medical aid program. The number of sealant patients and the proportion of sealant treatment were the highest in dental clinics, followed by dental hospitals and public health centers. The number of sealant patients were the highest in Gyeonggi and proportion of sealant patients were the highest in Jeonbuk.
ScienceON
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