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본 연구는 천연한방 식물 추출물의 치아우식 예방제제로서 가능성을 평가하고자 구강 양치용액과 함께 S. mutans에 대한 항균활성을 측정하고, 정상인 치은섬유모세포에 대한 독성 유무를 평가하여 다음과 같은 결과를 얻었다. 용매별 천연한방 추출물의 S. mutans에 대한 최소성장억제농도는 증류수보다 에탄올 추출물에서 우수한 성장억제 효과를 보였다. S. mutans에 대한 최소성장억제농도를 비교한 결과, 천연한방 에탄올 추출물은 보골지가, 구강양치액은 헥사메딘이 가장 낮은 농도에서 성장억제 효과를 보였다. S. mutans에 대한 최소살균농도를 비교한 결과, 천연한방 에탄올 추출물은 보골지가, 구강양치액은 헥사메딘과 가그린이 낮은 농도에서 사멸효과를 나타냈다. 정상인의 치은섬유모세포에 천연한방 에탄올 추출물을 최소성장억제농인 10, 39, 78μg/ml 로 처리하여 독성 유무를 측정한 결과 세포독성이 없었다. 그러나 최소살균농도 값을 토대로 각 추출물별 농도를 달리하여 처리한 결과, 보골지를 제외하고는 다른 추출물은 농도가 높아짐에 따라 세포독성이 있는 것으로 나타났다. 이상의 결과를 종합하면, 4종의 천연한방 추출물은 합성 화학물질인 구강양치액과 비교 시 유사한 항균효과가 있었다. 따라서 천연한방 추출물은 적정 농도를 첨가함으로써 치아우식 대체 예방제제로 실용화할 수 있을 것으로 생각된다. 【This study attempted to identify the possibility of natural herbal extracts as an alternative, preventive agent of caries by comparing antimicrobial activities between natural herbal extracts and mouth rinsing solutions against Streptococcus mutans. Natural herbal plants were extracted with distilled water and ethanol, respectively, to measure the minimum growth inhibitory concentration of S. mutans depending on concentration, and among which, solvents showing high antimicrobial activity were selected to compare their antibiotic effects with those of mouth rinsing solutions. Also, to determine the concentration of natural medicinal herbs that can be used safely in the oral cavity, the extracts were treated to the normal gingival fibroblast cells depending on concentration in order to determine its cytotoxicity using MTT. In terms of the minimum growth inhibition concentration, the growth inhibition of S. mutans was more excellent in the ethanol extract than in the distilled water. When the minimum growth inhibition concentration was compared, Psoralea corylifolia of natural herbal ethanol extracts, and Hexamedine (Bukwang Pharm., Korea) of mouth rinsing solutions inhibited growth of S. mutans at the lowest concentration. When the minimum bactericidal concentration was compared, P. corylifolia of natural herbal extracts, and Hexamedine and Garglin (Dong-A Pharm., Korea) of mouth rinsing solutions eliminated S. mutans at a low concentration. The human gingival fibroblast was treated with natural herbal ethanol extracts at the minimum growth inhibition concentration of 10, 39, and 78μg/ml . As the result, no cytotoxicity was found. When this was treated at different minimum bactericidal concentrations, natural herbal ethanol extracts showed cytotoxicity except P. corylifolia.】
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Kim et al. (2015) studied this question.
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