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최영찬,권정승,김성택,안형준,Choi, Young-Chan,Kwon, Jeong-Seung,Kim, Seong-Taek,Ahn, Hyung-Joon 대한안면통증구강내과학회 2009 Journal of Oral Medicine and Pain Vol.34 No.4
The purpose of this study was to present basic data that is needed in comprehension of dysesthesia after mandibular nerve injury and grasp meaning. We analyzed medical records of 59 patients who were diagnosed as dysesthesia after mandibular nerve injury from January 2007 to July 2009. The results are summarized as follows. 1. The most frequent cause was implant surgery (59%) and the most frequent injured branch of mandibular nerve was inferior alveolar nerve(81%). 2. The period passed after nerve injury showed significant interrelationship with level of pain. Visual Analogue Scale(VAS) increased from 4.82 to 6.91 after 6 month. 3. The period passed after nerve injury did not show significant interrelationship with recovery of dysesthesia. But, when conservative treatment was offered at earlier stage, ratio of patients who showed recovery of symptom tended to increase. 4. In computed tomography, level of invasion into inferior alveolar nerve canal did not show significant interrelationship with level of pain and recovery of dysesthesia. Conclusively, in the patients with dysesthesia of mandibular nerve, inferior alveolar nerve injury by dental implant surgery dominated most significant problem. Although level of invasion into inferior alveolar nerve is the most important factor to initiation of dysesthesia, there are other various factors exert more influence on the level of pain or recovery of dysesthesia. Therefore, begining conservative therapy at earlier stage is encouraged. Also, because nerve injuries can occur without direct invasion into nerve canal, so leaving enough safe space from nerve canal is needed for prevention of indirect nerve injury.
이산화탄소 레이저($CO_2$ laser)를 이용한 치은에 발생한 자극성 섬유종의 치료
최영찬,박주현,안형준,Choi, Young-Chan,Park, Ju-Hyun,Ahn, Hyung-Joon 대한안면통증구강내과학회 2010 Journal of Oral Medicine and Pain Vol.35 No.2
Carbondioxide($CO_2$) laser is one of the most widely employed lasers in oral soft tissue surgery because of its excellent affinity for water based soft tissues. It has some inherent advantages such as hemostasis, less postoperative swelling, reduction of bacterial population at surgical site, less need for suturing, less scarring, and less postoperative pain compared to conventional surgical therapies including the use of scalpel, diathermy, cryotherapy and electrosurgery. A 30-years-old male was presented with gingival swelling. Clinical examination revealed a well?defined pedunculated fibrotic mass on the buccal gingiva near right maxillary 1st molar. In radiographic examination, no remarkable abnormality was seen. Excisional biopsy was performed with $CO_2$ laser (continuous wave mode, 4.0W). Histological diagnosis was "Irritation fibroma". $CO_2$ laser has advantages those are suitable for surgical treatment of intraoral lesion. If appropriate training and experience are provided, the dentist would be able to manage intraoral lesions more efficiently and successfully with the use of the $CO_2$ laser.
1995 년 6 월 초순 제주해협과 대한해협 입구 해역에서의 해황 분석
최영찬(Young Chan Choi) 한국수산과학회 1998 한국수산과학회지 Vol.31 No.2
The physical and chemical characteristics were examined in the southern sea of Korea including the Cheju Strait, and the entrance of the Korea Strait in the period of May 30 to lune 8, 1995. The results are as follows. Firstly, the variation ranges of the temperature and salinity at the Cheju Stratit during 24 hours observation were larger in the surface layer than that in the deep layers. Secondly, daily variations of nutrients show that total inorganic nitrogen, phosphate phosphorous, and silicate silicon concentration are higher at night than at day. Thirdly, water temperature and salinity distributions show highest values at the entrance of Korea Strait, which in thought to be influenced directly by Tsushima Warm Current, while they show the lowest values in Cheju Strait. This means that the surface waters in Korea Strait are greatly influenced from the entrance of Korea Strait and bottom waters is greatly influenced from Cheju Strait. Fourthly, nutrients distribution shows highest values in Korea Strait but dissolved oxygen shows lowest values in the area. These Seem to be caused by the oxygen consumption used in the inorganization of nutrients to decompose organisms and the liquidation of nutrients.
농촌지도사업의 새로운 접근 : T & V , FSR & E , FF
최영찬(Young Chan Choe),최민호(MIn Ho Choi) 한국농촌지도학회 1994 농촌지도와 개발 Vol.1 No.1
This study undertakes a critical survey of literatures on the nest development in agricultural extension system; T&V(Traininig and Visit Extension), FSR&E(Fanning Systems Research and Extension), and FF(Farmer First). The study compares the three extension systems in their establishment, objectives, charactersistics, and methods, to find the minor factors for the betterment of agricultural extension system. Those are; 1) client-oriented program, 2) educational service, 3) comprehensive goal and work, 4) benefit to wide range of customers, 5) democratic program, 6) participatory approach, 7) four based experiment, 8) linkages among participants, 9) specialization of extensionists, 10) autonomy of extension offices, 11) humanstic program.
제주도 바다목장화개발 해역인 차귀도 연안해역의 이화학적특성
최영찬(Young Chan Choi),김진석(Jin Seok Kim) 한국해양환경·에너지학회 2006 한국해양환경·에너지학회 학술대회논문집 Vol.2006 No.-
At ten stations in Chagwi-Do coastal waters, in Jeju Island, there are six pysico-chemical water examinations through testing surface and bottom water in September and November in 2004 and March, May, August and November in 2005. First of all, the water temperature range of fluctuation is 16℃ from 12.2℃ to 28.9℃. Especially, bottom water is l30e in August. Next, salinity ranged from 30.2 to 34.9‰, In August. it shows the lowest salinity because of the land water. Third, NIP ratio, the growth factor of phytoplankton, shows various degrees from 5 to 76 in different stations and seasons. However, the average degree is over 22. That means phosphate phosphorus controlling factor of phytoplankton. Lastly, for organic carbon density, while TOC ranged from 92.5 to 438.3μM with an average 217μM, DOC ranged from 82.5 to 299.2μM with an average 130μM. The ratio of DOC/POC is 60% and dissolved organic carbon is examined mainly.