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지연된 의도적 재식술을 통한 치주 조직 재생 방법의 고찰
김유경(You-Kyoung Kim),김동주(Dong-Ju Kim),이은웅(Eun-Ung Lee),임현창(Hyun-Chang Lim),이중석(Jung-Seok Lee),정의원(Ui-Won Jung),윤정호(Jeong-Ho Yun),김의성(Eui-Seong Kim),이승종(Seong-Jong Lee),최성호(Seong-Ho Choi) 대한치과의사협회 2015 대한치과의사협회지 Vol.53 No.7
Purpose: Delayed intentional replantation was introduced as a new alternative to treat the teeth with severe periodontal involvement. The purpose of this study was to elucidate the possibility of delayed intentional replantation and establish theoretical backgrounds. Materials and Methods: Studies were performed into the following two subjects; ① Clinical evaluation of patients who underwent delayed intentional replantation using clinical and radiographic data. Severe periodontitis involved teeth were carefully extracted and proper time for delayed replantation was evaluated by analyzing inflammation markers (IL 6, TNF α). ② Theoretical studies for efficacy of delayed intentional replantation using ( ) Epigallocatechin 3 gallate (EGCG) for preservation of periodontal ligament cells on root surface by minimizing inflammation and treatment of inflammatory extraction sockets. Results: Meaningful success ratio and survival rate were found in delayed intentional replantation showing reduced bone loss and maintained bone level. Additionally, viability of EGCG applied periodontal ligament cells was much higher than control group. Also, EGCG promoted healing of inflammatory extraction sockets by inhibiting inflammatory cell proliferation. Conclusion: Within the limitations of this study, 1 2 weeks after extraction is an appropriate time to do delayed intentional replantation. Also, EGCG provides helpful effects on viability of periodontal ligament cells and periodontium.
이성민,이찬영,이승종,박동수,Lee, Seong-Min,Lee, Chan-Young,Lee, Seung-Jong,Park, Dong-Soo 대한치과보존학회 1989 Restorative Dentistry & Endodontics Vol.14 No.1
The purpose of this study was to evaluate the periodic effect of desensitizing drug such as potassium oxalate(D.D.S. # I&II), strontium chloride (ZAROSEN)$^{(R)}$, and placebo group. The 193 teeth of 93 patients who had been complained dental hypersensitivity, and were divided into three groups by application agent and desensitizing treatment was completed. The interval of observation and treatment period were immediately, 1 week, 2 week, 3 week, 4 week, before and after treatment. The data was statistically analized and the results were as followed. 1. Group I showed best desensitizing effect to the stimuli, followed by Group II, Group III. 2. There was a significant difference (p < 0.005) in desensitizing effect among the Group I, Group III and Group II, Group III but there was no significant difference (p < 0.005) in Group I, Group II. 3. The cold stimuli was most effective in desensitization and there was a significant difference (p < 0.005) in cold, air-blast, but there was no significant difference (p < 0.005) in other stimuli. 4. There was no significant difference (p < 0.005) in effect of the desensitization of the cause of exposed dentine. 5. Anterior teeth was more effective than posterior teeth in desensitization and there was a significant difference (p < 0.005) between anterior teeth and posterior teeth. 6. In analysis of stimuli on the potassium oxalate, there was a significant difference (p < 0.005) in cold, air-blast but there was no significant difference (p < 0.005) in other stimuli.
석유 코크스 가스화로부터 블루수소 생산을 위한 합성가스 탈황기술 검토
박노국(No-Kuk Park),김민규(Minkyu Kim),이승종(Seong Jong Lee),윤용승(Yongseung Yun) 한국에너지기후변화학회 2021 에너지기후변화학회지 Vol.16 No.2
In this study, we reviewed applicable desulfurization technologies for large-capacity blue hydrogen production from petroleum coke gasification. Since the petroleum coke includes higher sulfur content compared to gasification fuels of coal, biomass, and waste, the syngas produced from gasification contains about 17,000 ppmv and 200 ppmv of H<SUB>2</SUB>S and COS, respectively. Therefore, in order to produce high-purity hydrogen, the desulfruztion process of the produced syngas is needed. Syngas desulfurization technology can be divided into two technologies of wet technology and dry technology. Chemical (alkanolamine, ammonia, and alkali salts as absorbents) and physical (methanol and ethylene glycol as absorbers) had been developed. The developed technologies is used for the purpose of removing acid gases of hydrogen sulfide and carbon dioxide in a coal-based commercial gasification process. However, since gasification of petroleum coke contains a higher concentration of sulfur compounds than coal gasification, it is necessary to scale up or improve the performance of these. Moreover, the sophistication of desulfurization technology is required to produce high-purity hydrogen. In this study, we proposed rational combinations of desulfurization technology according to the operating conditions of the unit process of gasification technology.