• 대한화장품학회지
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• 제43권4호
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• pp.381-390
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• 2017

본 연구에서는 국내 유통 중인 자외선 차단 기능성화장품 총 100건을 대상으로 살균보존제 16종과 자외선차단성분 18종의 사용실태를 조사하였다. 그 결과, 검출률이 가장 높은 살균보존제 성분 5가지는 페녹시에탄올(61건), 안식향산(19건), 메틸파라벤(11건), 벤질알콜(8건), 프로필파라벤(7건)순이었으며, 자외선차단성분의 경우는 티타늄디옥사이드(81건), 에칠헥실메톡시신나메이트(69건), 징크옥사이드(48건), 에칠헥실살리실레이트(48건), 비스-에칠헥실옥시페놀메톡시페닐트리아진(44건)순이었다. 검사한 100건의 화장품 모두 검출된 살균보존제와 자외선차단성분 함량이 식품의약품안전처에서 정한 사용한도 기준에 적합하였지만 일부 자외선 차단 화장품의 경우 포장 용기에 표시되어 있지 않은 살균보존제와 자외선차단성분이 검출되었다. 100건 중 31건의 화장품에서 표시되지 않은 살균보존제 성분(벤질 알콜 등 6종)이 검출되었고, 2건에서는 표시되지 않은 자외선차단성분(호모살레이트 등 2종)이 검출되었다.

• Restorative Dentistry and Endodontics
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• 제20권2호
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• pp.780-788
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• 1995

The purpose of this study was to compare the apical seal following root canal shaping by different methods. From fourty extracted mandibular 1st and 2nd molars, fourty mesial roots whose canals have some degree of curvature were selected. The mesiobuccal root portion including mesiobuccal portion of a crown was sectioned in each molar. After access cavity preparation for the mesiobuccal canal, working length was determined with # 10 K-file. The sectioned roots were implanted in acrylic resin block and randomly divided into four groups. The canals of group I were shaped by step-down/balanced force, group II by stepdown/step-back, group III by step-back and group IV by conventional method. All of the shaped canals were obturated by Thermafil method and access cavities were filled with IRM. The roots were removed from acrylic resin block and placed in 100 % humidity for 7days. Except the root surfaces of apical 2mm, the root surfaces were nail-varnished 3 times. After the roots were placed in 700 torr vacuum pressure for 15 minutes, they were immersed in 2% methylene blue solution for 4 days. Nail varnishes were removed with acetone. After that, the roots were decalcified in 5 % nitric acid and dehydrated with alcohol series. Transparent specimens were made by methyl salicylate and the quality of apical seal was assessed by measuring the leakage linearly. The results were as follows. 1. The leakage in canals shaped by step-down/balanced force method was significantly less than that in canals shaped by step-back method(P<0.05) and was less but not statistically than that in canals shaped by step-down/step-back method (P>0.05). 2. The leakage in canals shaped by step-down/step-back method was less than that in canals shaped by step-back method, but there was no statistical significance(P>0.05). 3. The leakage in canals shaped by conventional method was significantly more than that in canals shaped by step-down/balanced force, step-down/step-back and step-back method (P<0.05).