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Kyoung In Yun,Min-Kyu Park,Myung-Kyun Park,Je Uk Park 대한구강악안면외과학회 2012 대한구강악안면외과학회지 Vol.38 No.6
Objectives: This study sought to evaluate fixation methods and determine the best method for the postoperative stabilization of maxillary osteotomy. For our analysis we performed a three-dimensional finite element analysis of stress distribution on the plate, screw, and surrounding bone, as well as displacement onto the plate. Materials and Methods: We generated a model using synthetic skull scan data; an initital surface model was changed to a solid model using software. Modified anterior segmental osteotomy (using Park’s method) was made using the program, and four different types of fixation methods were used. An anterior load of 100 N was applied on the palatal surface of two central incisors. Results: The Type 1 (L-shaped) fixation method gave stresses of 187.8 MPa at the plate, 45.8 MPa at the screw, and 15.4 MPa at the bone around the plate. The Type 2 (I-shaped) fixation method gave stresses of 186.6 MPa at the plate, 75.7 MPa at the screw, and 13.8 MPa at the bone around the plate. The Type 3 (inverted L-shaped) fixation method gave stresses of 28.6 MPa at the plate, 29.9 MPa at the screw, and 15.3 MPa at the bone around the plate. The Type 4 (I-shaped) fixation method gave stresses of 34.8 MPa at the plate, 36.9 MPa at the screw, and 14.9 MPa at the bone around the plate. The deflection of the plates for the four fixation methods was 0.014 mm, 0.022 mm, 0.017 mm, and 0.018 mm, respectively. Conclusion: The Type 3 (inverted L-shaped) fixation method offers more stability than the other fixation methods. We therefore recommend this method for the postoperative stabilization of maxillary osteotomy.
박히준,채윤병,차웅석,박종배,이혜정,이향숙,인창식,고형균,김수영,최일환,김강식,문정배,배기태,유경환,육근영,정병주,손인철,임사비나 WHO COLLABORATING CENTRE FOR TRADITIONAL MEDICINE 2004 東西醫學硏究所 論文集 Vol.2004 No.-
Background : The cun measurement System, an essential and convenient method in locating acupoints, has been widely used in the practice of acupuncture. However, traditional cun measurement has been criticized for its lack of reliability. Objectives : The purposes of this study are to determine if one cun measured by the directional methods have a consistency with that of proportional methods and to investigate which factors are related with these differences, especially in forearm. Methods : The distance between the elbow crease and the wrist crease of forearm was compared to a reference value of one cun obtained by the directional method. In this method, one cun is one third of the distance between index finger and Small finger of a subject, measured at proximal interphalangeal joint. In addition, to investigate the factors influencing the differences between these two methods, we measured the height and body weight and calculated body mass index (BMI). Finally we analyzed the factors correlated with these lengths by linear regression test. Results : The results showed that one cun obtained by the directional methods were significantly different from one cun by the proportional methods in forearm. It was demonstrated that the length acquired with the directional method was more correlated with body weight and body mass index, while the length obtained by the proportional method was more correlated with the height.
김경남,박광균,이자현,김광만 대한치과기재학회 1998 대한치과재료학회지 Vol.25 No.1
It is known that mutagenic effects can be related to various serious diseases, including cancer and birth defects. Therefore, detailed attention must be given to methodologies for evaluation of mutagenicity of dental materials, so that safe use of the products is ensured. The aims of this study were investigated the potential mutagenicity of compounds from 9 commercial dentin bonding agents (including primers and adhesives) using the Ames Salmonella typhimurium/microsome assays. Through this tests, Tenure S Bond Enhancer was showed mutagenecity and Tenure and Prima less in Salmonella typhimurium TA100 without metabolic activation. Hipolite Dentine was showed slight and Veridonfil-Photo, Prima and Tokuso Mac-Bond less in Salmonella typhimurium TA100 with metabolic activation. From this study, it was needed to further study with other kind of mutagenic tests.
조구등(釣鉤藤)의 4-VO로 유발한 흰쥐뇌허혈에 대한 신경방어효과
李仁煥,林康鉉,李鍾錫,石庚浩,安德均,朴虎君,김頀哲 대한본초학회 1999 大韓本草學會誌 Vol.14 No.2
Uncariae Ramulus et Uncus(UR, ???) has sweet in flavour and slightly cold in property, acting on the liver and pericardium channels. This drug was described in a medical classic as having the ability to remove "heat", check hyperfunction of the liver and relieve dizziness, tremors, and convulsion, and subdue "endogenous wind". So this study was planned to check the neuroprotective effect of UR on the global ischemia induced by 4-vessel occlusion in Wistar rats. and UR extract was lyophilized after extraction with 70% methanol. We induced 4-vessel occlusion for 10 minutes and reperfused again. The number of CA1 pyramidal neurons were counted after 7 days of reperfusion under the cresyl violet staining. In 4-VO ischemia model, UR showed significantly neuroprotective effects(1,000 and 500 ㎎/㎏ of UR extracts, p<0.05) compared with control group. Each neuroprotective ratio was about 23.0%, 19.0% respectively. Consequently, Uncariae Ramulus et Uncus has neuroprotective effects on the global ischermia induced by 4-vessel occlusion in Wistar rats. So we expect that Uncariae Ramulus et Uncus can be used as a drug for neurodegenerative disease.
Park, Chun,Kim, Jung Ran,Shin, Jae Kyoung,Kim, June Ki,Lee, Tae Kyun,Chung, Ji Chun,Park, Weon Hwan,Park, Sun Dong,Nam, Kyung Soo,Lee, Young Choon,Kim, Cheorl Ho 한국키틴키토산학회 1997 한국키틴키토산학회지 Vol.2 No.2
A mycelial chitin deacetylase has been purified from a chitin deacetylase-hyperproducing fungus, Absidiα coerulea CHK-1. The purified enzyme had a molecular mass of about 62 kDa on denaturated and natural conditions. The pI was 5.5. The chitin deacetylase, when resolved by SDS-PAGE, was positive for Schiff staining, suggesting that the enzyme is a glycoprotein. When O-hydroxylated chitin (glycolchitin) was used as a substrate, the enzyme displayed a temperature optimum of around 50℃ and a pH optimum of around PH 5,5. The enzyme was stable to incubation from pH 3.0 to pH 6.5 at 4℃ for 24 hr. The presence of chitin protected the enzyme from heat inactivation, the extent depending upon the substrate concentration. The activity of the enzyme was stimulated by Mn2+ ion. The enzyme is active on chitooligosaccharides with more than two N-acetylglucosamine residues (M-acetylchitobiose). However, the enzyme is not active on N-acetylglucosamine. The enzyme had an apparent Km of 12.4 mM and Kcat of 32.4 /sec for glycol chitin, respectively.
Park, Sang Kyun,Cho, Min Kyoung,Park, Hye-Kyung,Lee, Keun Hee,Lee, Sun Joo,Choi, Seon Hee,Ock, Mee Sun,Jeong, Hae Jin,Lee, Moo Hyung,Yu, Hak Sun Williams Wilkins 2009 JOURNAL OF IMMUNOLOGY Vol.182 No.11
<P>We have cloned the macrophage migration inhibitory factor (MIF)-like protein (Anisakis simplex (As)-MIF) from larvae of the whale worm (Anisakis simplex third-stage larvae). Asthma was induced in the mice using OVA/alum, with or without various concentrations of rAs-MIF treatment before OVA/alum challenge. Treatment with rAs-MIF coupled with OVA/alum during the challenge period induced a complete inhibition of eosinophilia and goblet cell hyperplasia within the lung and profoundly ameliorated the development of lung hyperreactivity. Also, rAs-MIF was shown to reduce profoundly the quantity of Th2-related cytokines (IL-4, IL-5, and IL-13) in the bronchial alveolar lavage fluid and allergen-specific IgG2a in sera. IL-10 and TGF-beta levels in the bronchoalveolar lavage fluid of the rAs-MIF-treated group were significantly higher than in the other groups. Additionally, CD4(+)CD25(+)Foxp3(+) T cells (regulatory T) were recruited to the spleen and lungs of the rAs-MIF-treated mice, but this recruitment was inhibited by anti-rAs-MIF Ab.</P>
Kyoung In Yun,Young-Gyu Cho,Jong-Min Lee,Yoon-Hee Park,Myung-Kyun Park,Je Uk Park 대한구강악안면외과학회 2012 대한구강악안면외과학회지 Vol.38 No.5
Objectives: This study evaluated a range of fixation methods to determine which is best for the postoperative stabilization of a mandibular osteotomy using three-dimensional finite element analysis of the stress distribution on the plate, screw and surrounding bone and displacement of the lower incisors. Materials and Methods: The model was generated using the synthetic skull scan data, and the surface model was changed to a solid model using software. Bilateral sagittal split ramus osteotomy was performed using the program, and 8 different types of fixation methods were evaluated. A vertical load of 10 N was applied to the occlusal surface of the first molar. Results: In the case of bicortical screws, von-Mises stress on the screws and screw hole and deflection of the lower central incisor were minimal in type 2 (inverted L pattern with 3 bicortical repositioning screws). In the case of plates, von-Mises stress was minimal in type 8 (fixation 5 mm above the inferior border of the mandible with 1 metal plate and 4 monocortical screws), and deflection of the lower central incisor was minimal in types 6 (fixation 5 mm below the superior border of the mandible with 1 metal plate and 4 monocortical screws) and 7 (fixation 12 mm below the superior border of the mandible with 1 metal plate and 4 monocortical screws). Conclusion: Types 2 and 6 fixation methods provide better stability than the others.