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Clinical Features and Correlation With Congenital Missing Teeth of Delayed First Permanent Molar
이명연,이효설,송제선,이제호,최병재,김성오,김승혜,Lee, Myeongyeon,Lee, Hyoseol,Song, Jeseon,Lee, Jaeho,Choi, Byungjai,Kim, Seongoh,Kim, Seunghye Korean Academy of Pediatric Dentistry 2017 大韓小兒齒科學會誌 Vol.44 No.1
국소적, 전신적 요인을 동반하지 않는 제1대구치의 맹출 지연은 해당 치아의 발육 지연을 동반한다. 본 연구의 목적은 제1대구치의 발육지연의 임상적 양상 및 동반하는 다른 치아의 발달 이상에 관하여 고찰하는 것이다. 국소적 요인이 없이 제1대구치 맹출 지연을 보이는 건강한 어린이 40명의 파노라마방사선 사진 분석을 시행하였다. 2명의 평가자가 Nolla 방법을 이용하여 해당 치아의 발육지연 여부, 해당 분악의 제2대구치 발육 이상 여부 및 제3대구치를 제외한 다른 치아의 선천적 결손 여부에 관하여 조사하였다. 제1대구치의 발육지연은 상악에서 호발하였고, 여성에게서 양측성 이환, 남성에게서 편측성 이환이 많이 관찰되었다. 제1대구치의 발육지연이 있는 환아는 유의하게 높은 선천적 결손치의 유병률을 보였으며, 이환된 분악의 제2대구치는 모두 발육 지연 혹은 선천적 결손의 이상을 보였다. 본 연구결과 제1대구치의 발육지연은 다른 치아의 선천적 결손과 밀접한 연관이 있는 것으로 나타났다. Delayed eruption of the first molar, without a generalized or localized cause, is usually associated with delayed development of the affected tooth. The aim of this study was to investigate the clinical features of the first permanent molar showing delayed development and eruption, and its association with developmental anomalies of other teeth. Panoramic radiographs of 40 healthy children showing delayed development and eruption of first permanent molars were analyzed. The clinical features of affected first molars and developmental anomalies of other teeth (except third molars) were evaluated. Delayed first molars were more frequent in the maxilla. The incidence of bilateral delayed development of first molars was greater than that of unilateral cases in female patients. In contrast, male patients showed unilateral delayed development of the first molar more frequently. A higher incidence of congenitally missing teeth was observed in patients with delayed first molar. In each case, delayed development or congenital absence was observed in the second molar adjacent to the delayed first molar. Overall, delayed first molar seems to be associated with congenital absence of additional teeth. Understanding the developmental mechanisms of this phenomenon requires further studies.
Molybdenum Blue에 의한 Dimethyl Polysiloxane의 정량
이명연,양미영 成均館大學校 1976 論文集 Vol.22 No.-
Determination methods of dimethyl polysiloxane had been reported by gravimetry, colorimetry, I.R, U.V, G.L.C etc. This study observed an easier method than those experiments with molybdenum blue color reaction. The sample is decomposed by adding 40㎖ of combined conc. acid (H_2SO_4 : HNO_3=1 : 1) and heating in Kjeldahl flask. Alkalihydroxide sol. is added to the sol. and alter it with sulfuric acid to weak acidify, then adding 3㎖ of 5% ammonium molydate sol. and treat in boiling water bath. After adding 10㎖ of 6N-H_2SO_4, 3㎖ of 0.05% hydrazine sulfate and dist. water in 50㎖ vol. flask, treat in boiling water bath again. The range of determination is about 0.4∼5.6 ㎍/㎖ with regard to sol. of color reation.
Molybdenum blue에 의한 인산과 비산의 분리 정량
이명연,안창식 成均館大學校 1971 論文集 Vol.16 No.-
In acidic solution of sulfuric acid, phosphate and arsenate in a sample have been determined spectrophotometrically as molybdenum blue after the reduction with hydrazine sulfate. To determine the phosphate and arsenate separately, arsenate has been reduced with potassium iodide and sodium sulfite, then only phosphate has determined.
Prader-Willi syndrome 환자의 치과 치료
이명연(Myeong-Yeon Lee),정연욱(Younwook Jung),김성오(Seong-Oh Kim),최형준(Hyung-Jun Choi),손흥규(Heung-Kyu Son),이효설(Hyo-Seol Lee) Asia association of Disability and Oral health 2014 International Journal of Disability and Oral Healt Vol.10 No.1
프라더 윌리 증후군과 원인을 알 수 없는 심낭 삼출을 앓고 있는 3세 남환이 치아우식을 주소로 내원하여 임상 구강검사 결과 다발성 우식증과 구강 전반에 걸친 치아 마모증이 관찰되었다. 약 10개월간 보존적인 수복치료와 구강 위생관리를 시도하였으나, 치아 우식의 빠른 진행과 환아의 협조도 부족으로 전신마취 하 우식 치료를 시행하였다. Prader-Willi syndrome (PWS) is a rare neurodevelopmental disease caused by abnormality of chromosome 15q11-13. The estimated prevalence of PWS is 1/10,000-30,000. Most common features of this disease are feeding problems characterized by poor sucking habit related with neonatal or infantile hypotonia and obesity due to early childhood hyperphagia involved with lack of satiety. In the orodental findings, enamel hypoplasia, rampant caries, delayed eruption, poor oral hygiene, hypodontia, supernumerary teeth, increased tooth wear, decreased salivary flow and change in saliva composition were reported. This case report describes the dental treatment of 3-year-9-months-old male patient with PWS. Periodic check-ups and conservative treatments were followed, however, rapid dental caries progression caused by estimating hyposalivation was observed. Because of lack of patient cooperation, dental procedures were performed under general anesthesia.
취조직내 Protein Methylases 활성도에 관한 연구
이명연,홍성렬,이춘우 대한약학회 1983 약학회지 Vol.27 No.4
Among the many protein modifications methylation is being investigated actively with regard to bacterial chemotaxis, gene regulation, muscle contraction, cytochrome c methylation, and the synthesis of the acyl transporter, carnitine. In this study the activities of protein methylase I, II, and III in pancreatic tissues of rat, mouse, and guinea pig were examined. Furthermore, the effect of cholinergic agents on the activity of protein methylases in pancreatic fragment of guinea pig was also examined in order to test the relationship between protein methylation and pancreatic secretion. The results are as follows. 1) The activities of protein methylases were generally high in pancreatic tissues of guinea pig and mouse but low in the tissue of rat. 2) The cholinergic stimulants, acetylcholine and carbachol at a concentration of $10^{-5}M$ decreased the activities of protein methylase I, II, and III compared with unstimulated control. 3) The inhibitory effect of the cholinergic stimulant on the activities of protein methylases was not blocked by atropine at a concentration of $10^{-5}M$.