The prediction of the tooth size in the mixed dentition for Korean

Moon, Sung-Hwan,Kim, Seong-Oh,Yu, Hyung-Seong,Choi, Byung-Jai,Choi, Hyung-Jun,Lee, Jae-Ho 大韓小兒齒科學會 2006 大韓小兒齒科學會誌 Vol.33 No.2

이번 연구의 목적은 혼합치열기 아동에서 미맹출된 견치와 소구치의 크기를 예측하는데 있어서 한국인에 맞는 방정식을 만들기 위함이다. 미맹출 치아의 크기를 예측하는 것은 혼합치열기 교정 진단과 치료계획 수립에 있어서 매우 중요하다. 미맹출된 견치와 소구치 크기를 예측하는 방법은 몇가지가 있지만 그중에서도 가장 흔하게 쓰이는 것이 모이어의 예측표와 다나카와 존스턴의 방정식이 있다. 하지만 그것들은 백인을 위해서 제작된 것이고 치아 크기는 인종에 따라서 다르다고 알려져 있다. 이번 연구에서는 치아크기를 측정하여 하악 영구 절치의 크기 합과 견치 및 소구치의 크기 합 사이의 상관관계를 구하고 회귀방정식을 이용해서 한국인에 맞는 예측표를 만들었다. 연세대학교 치과대학에 재학중인 178명의 한국 학생(남 108명, 여 70명, 평균연령 21.63)을 대상으로 실험하였다. 영구치의 근원심 폭경을 석고모형상에서 calipers를 이용해서 측정하였다. 성별간의 치아 크기는 차이가 있었다(p<0.05). Correlation coefficient는 0.57에서 0.64의 범위였고, standard errors of the estimates 는 여성에서 0.6으로써 남성보다 우수하였다. r^(2)값은 0.27에서 0.41의 범위를 나타내었다. Estimating the size of unerupted teeth is an essential aspect of orthodontic diagnosis and treatment planning in the mixed dentition. Several methods were introduced and used for the prediction. The most common methods among these would be Moyers probability chart and Tanaka and Johnston equations. These are currently used widely, but they were developed for Caucasians. Because there are clear racial differences in teeth size, the objectives of this study were to produce correlation coefficients between the combined mesiodistal widths of the permanent mandibular incisors and those of the canines and premolars for each quadrant, and prediction tables with regression equations, specifically for Korean. 178 young adults (70 women, 108 men, mean age 21.63 years) were selected from the College of Dentistry, Yonsei University, Seoul, Korea. The mesiodistal crown diameters of the permanent teeth were measured with calipers. Significant sexual dimorphism was found in tooth sizes. The correlation coefficients between the total mesiodistal width of the mandibular permanent incisors and those of the maxillary and mandibular canines and premolars were found to be between 0.52 and 0.64. The standard error of the estimatation was better (0.60) for women and the r^(2) values ranged from 0.27 to 0.41 for both sexes, Prediction tables were prepared for Korean. This study showed larger canine and premolar diameters than Tanaka and Johnston's and Moyers' studies which might be due to the racial differences. Further investigations with a larger sample size will be needed for more representative data on the Korean population.

한 · 일 중재법상 중재판정의 비교법적 고찰

최석범,정재우,김태환 韓國仲裁學會 2006 중재연구 Vol.16 No.1

The parties in the trade can have full autonomy and can resolve disputes independently, impartially and without delay by selecting arbitration by agreement. Korea and Japan had revised their Arbitration Laws to incorporate as many provisions of the 1985 UNCITRAL Model Law as possible. Japan had amended its century-cld arbitration law, becoming the 45th country to adopt the UNCITRAL Model Law on International commercial arbitration. New Arbitration Law was enacted as Law No.138 of 2003 and effective on March 1, 2004, is applicable to both national international arbitration. Korea had amended its arbitration law on December 31, 1999 and its New Arbitration Law incorporates the most of the 1985 UNCITRAL Model Law as Japan. Arbitration must be popular in resolving international commercial disputes in Northeast Asian bloc in order to increase the volume of intra-trade in the Northeast Asian bloc. But in order for the parties to make use of arbitration in the bloc, the arbitration laws of nations in the bloc must have similarity and unification. As Korea and Japan playes important roles in the bloc, both nations's arbitration laws must be studied in view of similarity and difference to unify both nations' arbitration laws by way of showing an example. Therefore, this paper deals with both nations' arbitration laws in view of comparative law to unify their arbitration laws and Northeast Asian Nations' arbitration laws.

효과적인 실험지도(화학분야)방안에 관한 연구

최재환 大邱敎育大學校 科學敎育硏究所 1990 과학·수학교육연구 Vol.14 No.-

The aim of the study is to find some problems which could be during the period of teaching the units on experiment and to show the solutions to them. Acid and salt concentration must be below 0.1 Mol for the effective neutralization titration and the experiment is the most effective when the concentration is the same. In the case of metal reaction to acid, the formation of hydrogen is active and easily visible when acetic acid concentration is 9~12% and hydrogen chloride concentration 7~9%. For the purpose of comparing the mass of air and carbon-dioxide, a handy apparatus was devised in the process of the study.

발프로산나트륨과 페니토인과의 약물상호작용

최준식,유재신,박용채,이진환 朝鮮大學校 1997 藥學硏究誌 Vol.18 No.2

This study was attempted to investigate the pharmacokinetic interaction between sodium valproate (4. 8. 16 ㎎/㎏. i.v.) and phenytoin (4 ㎎/㎏. i.v) in rabbits. The plasma concentration and area under the curve (AUC) of phenytoin were increased significantly (p<0.05. p<0.01) when coadministered with sodium valproate (4. 8. 16 ㎎/㎏) in rabbits. The volume of distribution and total body clearance of phenytoin were decreased significantly (p<0.05. p<0.01) when coadministered with sodium valproate (8. 16 ㎎/㎏) in rabbit. From the results of this experiment. it is desirable that dosage regimen of phenytoin should be adjusted and therapeutic drug monitoring should be performed for reduction of side or toxic effect when phenytoin will be coadministered with sodium valproate in clinical use.

산과 염기의 개념분석과 오인에 관한 연구

崔在煥 大邱敎育大學校 科學敎育硏究所 1992 과학·수학교육연구 Vol.16 No.-

The purpose of this study is pesultionship Between the Cognitive of child and conceptions about Acid and base. The results were as follows. 1. The cognitive level of most 5th elementary school student in korea in general, sty in the concrete operational stage, pre-operational stage and only one pupil have reched formal operational stage. 2. The degree of understanding of conceptions about acid and Base showed the acid higher achivment than the base.

운동에 따른 MDA 및 SOD, GPx, CAT와 면역기능의 변화 고찰

최종환, 한재영 忠北大學校 平生體育硏究所 2013 平生體育硏究所 論文集 Vol.25 No.-

1. The change of MDA in accordance with exercise Many researchers at home and abroad told that MDA concentration tends to be low significantly if we do regular exercise in the long term. This means the adaptation of defence mechanism of antioxidants caused by moderate exercise. 2. The change of SOD, GPx, and CAT in accordance with exercise. The increase of SOD will be expected if a regular exercise in the long term is implemented regardless of a type, intensity, and time of the exercise. Meanwhile, at preceding researches, CAT showed significant change in high intensity exercise. It seems that GPx is significant when high intensity exercise is done and it is more activated by long-term and long-time exercise. 3. An intake of antioxidants and the change of SOD, GPx, and CAT in accordance with exercise It is reported that an intake and exercise of Vitamin C and E enhances resistiveness against lipid peroxide, and endurance exercise capacity significantly in many researches. Also, an intake of antioxidants and exercise do not have an effect on the activation of SOD through an intake of Vitamin, but high intensity exercise and an intake of Vitamin enhance the activation of SOD, and CAT. 4. The change of immune system in accordance with exercise and an intake of antioxidants It is reported that an intake of antioxidants and exercise have an effect on immune system. It is also reported that the medium intensity exercise enhances the increase of immune system, but high intensity exercise enhances the long-term increase of it. Meanwhile, if the period for an intake of antioxidants is short, antioxidants do not affect immune system. Also, independent treatments of antioxidant vitamins is limited about the improvement of immune function. 5. Suggestions The excessive exercise increases antioxidant enzymes like SOD, CAT, and GPx in skeletal muscles, heart, and livers. The threshold value and magnitude of exercise are different in accordance with enzymes and tissues. The validity of these findings are recognized by studying the response of free oxygen radicals in various tissues. However, mechanism that antioxidant enzymes are activated in short term during exercise is not acknowledged so it may be necessary that a research should be implemented about how the quick activation of antioxidant enzymes effectively responds to a cell damage from peroxide lipid. Also, the treatment of antioxidant vitamins enhances the activation of antioxidant enzymes and immune function, but a research about proper intake and period of antioxidant vitamins in addition to exercise in order to block the oxidative damage is necessary in the following research. Meanwhile, Methionine is the essential amino acids for growth and maintenance of cellular tissues. Jo Soo Yeal(1997) reported that an intake of Methionine improved the activation of SOD significantly. It is also reported that sulfhydryl group, one of metabolites of Methionine, acts as a direct remover of free radical, maintains Glutathione concentration constantly, and works as the disposition of glutathione peroxidase to protect cells from lipid peroxidation.(Shwa, et al., 1981) Methionine is the essential amino acids to protect cells from the reactive oxygen as a role of antioxidants. Until now, comparative studies about Methionine and existing antioxidants in relation to exercise have not been sufficient. Therefore, it may be meaningful that the effect on Methionine and existing antioxidants in relation to the relation of exercise and antioxidant enzymes in the following research.

SJO¨GREN'S SYNDROME 환자에게 즉시 임프란트 술식을 행한 치험례

최정환,손동석,이지연,이윤서,안선희,이재목 대한악안면성형재건외과학회 2000 Maxillofacial Plastic Reconstructive Surgery Vol.22 No.5

The old edentulous patients experience xerostomia commonly. They have considerable difficulty in wearing tissue-supported prosthesis and high risk rate of caries. One of them is Sj□gren's syndrome patient. Sj□gren's syndrome is a chronic inflammatory autoimmune disorder that results in a lymphocyte-mediated destruction of exocrine glands. We planned to place implants immediately after extraction in this case of autoimmune disease. The advantages of immediate implant placement include considerable decrease in time from tooth extraction to placement of the final prosthesis, fewer surgical procedures, and better acceptance of the overall treatment plan. We present a case of Sj□gren's syndrome patient treated with immediate implant placement & immediate loading in anterior region and immediate implant placement in posterior region.

자연과 탐구학습에서의 가설 설정 방법에 관한 연구

崔在煥 大邱敎育大學校 1992 論文集 Vol.27 No.-

체외 충격파 쇄석기에 의해 발생된 음향 흐름 현상 연구

최민주,이승환,홍경진,김호찬,박재우,이헌주 제주대학교 공과대학 첨단기술연구소 2001 尖端技術硏究所論文集 Vol.12 No.2

Acoustic streaming produced by an extracorporeal shock wave lithotripter was visualized for the first time in the present study. It was observed that the streaming velocity increased with the shock wave amplitude and was reaching up to 3 cm/s at the highest output setting of the lithotripter.

租稅에 의한 所得再分配效果의 有效性

崔壬煥,李載殷 成均館大學校 韓國産業硏究所 1981 韓國經濟 Vol.9 No.-