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강일현,심연수,김아현,안소연 대한통합치과학회 2018 대한통합치과학회지 Vol.7 No.1
The aims of this study were to measure the linear polymerization shrinkage and microhardness of recently developed dental restorative composite resins and compare it with those of conventional methacrylate-based dental composite resins. Two methacrylate-based composites (Z100, Z350 flowable) and two recently developed composite (Venus®(Heraus,Germany), SDRTM(Densply,Germany)) were investigated. The polymerization shrinkage and stress of the composites during light curing was measured with the strain gage method and surface microhardness was measured with Micro Hardness Tester(JT Toshi Inc, Japan). The shrinkage of SDRTM was the lowest, and that of Z350 flowable was the highest. Peak polymerization shrinkage rate was the lowest in SDRTM and the highest in Z350 flowable. Among materials, Z100 showed significantly higher micro hardness than any other materials after curing(p<0.05). Micro hardness of SDR showed higher value than that of Venus, Z350 but no significant difference(p<0.05)
전자담배 (E-cigarettes; Electronic Nicotine Delivery System)와 치과팀의 역할
강일현,안소연,김아현 대한통합치과학회 2017 대한통합치과학회지 Vol.6 No.1
The direct effects of electronic cigarette on oral health have yet to be grounded, but there is a possibility of adverse effects as a cigarette. However there is a lack of understanding about electronic cigarettes. Therefore this paper aims to give a general overview of the definition and use of electronic cigarettes, quasi-drugs for quitting smoking, the effects on general health and oral health, and the role of dental teams.
스테로이드 합성을 교란하는 내분비계장애물질 검색을 위한 라이디히 세포 분리 및 배양조건 확립
강일현(Il Hyun Kang),강태석(Tae Seok Kang),강호일(Ho Il Kang),문현주(Hyun Ju Moon),김태성(Tae Sung Kim),기호연(Ho Hyun Ki),류혜원(Hye Won Ryu),신재호,동미숙(Mi Sook Dong),한순영(Soon Young Han),김승희(Seung Hee Kim),홍진환(Jin Hwan Hong 한국환경성돌연변이발암원학회 2006 한국환경성돌연변이·발암원학회지 Vol.26 No.2
Normally, environmental toxicants are classified as endocrine disruptors if they interfere with regulation of cellular function by endogeneous steroids through inhibition of receptor binding and/or transcriptional activation. So, many studies have been performed about agonist/antagonist of hormone receptor to study mechanisms of endocrine disruptors. If toxicants affect steroid biosynthesis and/or degradation and alter hormone homeostasis, these also are classified as endocrine disruptors. But there are not many studies of the mechanisms of endocrine disruptors on the basis of alteration of steroid biosynthesis and/or degradation. Isolation and culture of Leydig cells from testis is one of methods for the steroidogenesis screening assays to evaluate a substance for altering steroidogenesis. Leydig cells were harvested using the method described by Klinefelter with modifications. Leydig cells were purified by perfusion of testis and incubation (34℃, 80cycles/minute, 20 minutes) with collagenase (0.25 ㎎/㎏), centrifugal elutriation, percoll gradient centrifugation and BSA multidensity gradient centrifugation. To confirm if this method is one of appropriate tools to evaluate a substance for altering steroidogenesis, ketoconazole, positive control was administered to purified Leydig cells. Ketoconazole (10??M and above) significantly reduced testosterone production in purified Leydig cells. From above results, we suggest that this method for steroidogenesis screening assay appears to be a appropriate tool to detect suspected compounds for altering steroidogenesis.
유방암세포에서 카드뮴에 의해 유도된 아폽토시스에 대한 아연의 저해효과
신재호,강일현,한순영,이수정,김태성,문현주,강태석,김안근,오지영 환경독성보건학회 2005 환경독성보건학회지 Vol.20 No.4
아연은 다양한 독성 물질로부터 유도된 아폽토시스를 저해하는 것으로 알려져 있으나 이 기전에 대해서는 명확히 밝혀지지 않았다. 본 연구에서는 인간 유방암 세포 MCF-7에 카드뮴을 처리하였을 때 유도되는 아폽토시스에 대한 아연의 저해효과를 살펴보았다. 아연의 아폽토시스 저해 효과는 DNA 분절현상, 핵의 쪼개짐 그리고 caspase-9의 발현을 통하여 확인하였다. 또한 아연의 아폽토시스 저해효과가 카드뮴에 의한 산화적 스트레스와 관련이 있는지 확인하기 위하여 활성산소인 peroxide의 농도를 세포내에서 측정하였다. 나아가 superoxide dismutase (SOD), catalase (CAT) 그리고 glutathion reductase (GR)같은 활성산소에 대한 인체내 방어기작으로 작용하는 항산화 효소의 활성을 측정하였다.본 연구를 통해 아연이 카드뮴에 의해 생성된 세포내의 활성산소의 양을 감소시키고 항산화 효소를 회복시키는 기전이 카드뮴에 의한 아폽토시스를 저해하는 한 요인으로 사료되어진다.