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- 저자 : 김송하 ( Song Ha Kim ) (검색결과 2 건)
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상악 구치부 Intrusion과 MEAW를 이용한 골격성 개방교합 환자의 비수술적 교정치료: 치료 후 2년 유지 결과 포함
김송하(Song-Ha Kim),김지권(Ji-Kwon Kim),오민희(Min-Hee Oh),조진형(Jin-Hyoung Cho),이경민(Kyungmin C. Lee) 대한치과교정학회 2024 대한치과교정학회 임상저널 Vol.14 No.1
In cases where anterior open bite is accompanied by maxillary posterior extrusion, it is necessary to apply orthodontic force for maxillary posterior intrusion during non-surgical treatment. Utilizing skeletal anchorage for maxillary posterior intrusion allows for non-surgical correction of anterior open bite, providing an aesthetically pleasing outcome without side effects such as unwanted extrusion of other teeth. This case report presents the non-surgical treatment of a skeletal anterior open bite patient, a 22-year-old woman, by applying maxillary posterior intrusion using mini-implants and incorporating the use of a Multi-Loop Edgewise Arch Wire (MEAW). The report also includes a two-year follow-up after treatment. The patient presented with anterior open bite, which was successfully corrected through maxillary posterior intrusion. Additionally, tongue exercises were performed during and after orthodontic treatment to correct tongue thrusting habits. During a follow-up visit two years after treatment, although there was a slight decrease in overbite, the occlusion remained stable, indicating a still successful and stable outcome. (Clin J Korean Assoc Orthod 2024;14(1):46-56)
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화학물질 관리 연구-2. 환경부와 고용노동부의 관리 화학물질의 구분, 노출기준 및 독성 지표 등의 특성 비교
김선주 ( Sun Ju Kim ),윤충식 ( Chung Sik Yoon ),함승헌 ( Seung Hon Ham ),박지훈 ( Ji Hoon Park ),김송하 ( Song Ha Kim ),김유나 ( Yu Na Kim ),이지은 ( Ji Eun Lee ),이상아 ( Sang Ah Lee ),박동욱 ( Dong Uk Park ),이권섭 ( Kwon Seob L 한국산업보건학회 2015 한국산업보건학회지 Vol.25 No.1
Objectives: The aims of this study were to investigate the classification system of chemical substances in the Occupational Safety and Health Act(OSHA) and Chemical Substances Control Act(CSCA) and to compare several health indices (i.e., Time Weighted Average (TWA), Lethal Dose (LD50), and Lethal Concentration (LC50) of chemical substances by categories in each law. Methods: The chemicals regulated by each law were classified by the specific categories provided in the respective law; seven categories for OSHA (chemicals with OELs, chemicals prohibited from manufacturing, etc., chemicals requiring approval, chemicals kept below permissible limits, chemicals requiring workplace monitoring, chemicals requiring special management, and chemicals requiring special heath diagnosis) and five categories from the CSCA(poisonous substances, permitted substances, restricted substances, prohibited substances, and substances requiring preparation for accidents). Information on physicochemical properties, health indices including CMR characteristics, LD50 and LD50 were searched from the homepages of the Korean Occupational and Safety Agency and the National Institute of Environmental Research, etc. Statistical analysis was conducted for comparison between TWA and health index for each category. Results: The number of chemicals based on CAS numbers was different from the numbers of series of chemicals listed in each law because of repeat listings due to different names (e.g., glycol monoethylether vs. 2-ethoxy ethanol) and grouping of different chemicals under the same serial number(i.e., five different benzidine-related chemicals were categorized under one serial number(06-4-13) as prohibited substances under the CSCA). A total of 722 chemicals and 995 chemicals were listed at the OSHA and its sub-regulations and CSCA and its sub-regulations, respectively. Among these, 36.8% based on OSHA chemicals and 26.7% based on CSCA chemicals were regulated simultaneously through both laws. The correlation coefficients between TWA and LC50 and between TWA and LD50, were 0.641 and 0.506, respectively. The geometric mean values of TWA calculated by each category in both laws have no tendency according to category. The patterns of cumulative graph for TWA, LD50, LC50 were similar to the chemicals regulated by OHSA and CCSA, but their median values were lower for CCSA regulated chemicals than OSHA regulated chemicals. The GM of carcinogenic chemicals under the OSHA was significantly lower than non-CMR chemicals(2.21 mg/m3 vs 5.69 mg/m3, p=0.006), while there was no significant difference in CSCA chemicals(0.85 mg/m3 vs 1.04 mg/m3, p=0.448). LC50 showed no significant difference between carcinogens, mutagens, reproductive toxic chemicals and non-CMR chemicals in both laws’ regulated chemicals, while there was a difference between carcinogens and non-CMR chemicals in LD50 of the CSCA. Conclusions: This study found that there was no specific tendency or significant difference in health indices such TWA, LD50 and LC50 in subcategories of chemicals as classified by the Ministry of Labor and Employment and the Ministry of Environment. Considering the background and the purpose of each law, collaboration for harmonization in chemical categorizing and regulation is necessary.
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