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방사선불투과성 무기입자를 첨가한 교대배열 폴리비닐알코올 마이크로피브릴의 제조
조혜원(Hye Won Jo),차진욱(Jin Wook Cha),한성수(Sung Soo Han),이준석(Joon Seok Lee),오태환(Tae Hwan Oh) 한국고분자학회 2013 폴리머 Vol.37 No.5
폴리비닐알코올(poly(vinyl alcohol), PVA) 마이크로피브릴(microfibrils)을 금속 색전코일을 대체할 수 있는 고분자 색전코일에 적용하기 위해 벌크중합으로 폴리피발산비닐(poly(vinyl pivalate), PVPi)을 제조하고 비누화 공정에서 방사공정 없이 중합도가 1100 교대배열 다이애드(diad)기 함량 60.4%인 교대배열 PVA(syndiotactic PVA, s-PVA) 마이크로피브릴을 제조하였다. 또한 별도의 조영제의 투여가 불필요한 마이크로피브릴 제조를 위해 방사선불투과성 물질인 이산화지르코늄과 황산바륨을 비누화 공정에서 첨가하여 방사성불투과성 교대배열 PVA 마이크로피브릴을 제조하였고, 무기입자 함유 s-PVA 마이크로피브릴의 computed tomography(CT) value 값 측정 결과 이산화지르코늄의 함량이 12 wt% 이상에서, 황산바륨은 6 wt% 이상에서 1000 이상의 우수한 방사선불투과성을 나타내는 것을 확인하였다. Poly(vinyl pivalate) (PVPi) was bulk polymerized to make poly(vinyl alcohol) (PVA) microfibrils to apply for polymeric embolization coils replacing metalic coils. Then, syndiotactic PVA (s-PVA) microfibrils having number-average degree of polymerization of 1100 and s-diad content of 60.4% were prepared via saponification of the PVPi with no separate spinning process. To make s-PVA microfibrils with radiopacity, zirconium dioxide (ZrO2) and barium sulfate (BaSO4) were added into s-PVA microfibrils during saponification. The computed tomography (CT) value indicating radiopacity reached up to over 1000 when the amount of ZrO2 and BaSO4 were 12 and 6 wt%, respectively.
김수경 ( Soo Kyung Kim ),조혜원 ( Hye Won Jo ),백세림 ( Se Rim Back ),이경희 ( Kyeong Hee Lee ) 한국치위생학회(구 한국치위생교육학회) 2014 한국치위생학회지 Vol.14 No.3
Objectives : The purpose of the study is to investigate the relationship between the removal of halitosis and use of oral hygiene devices. Methods : A self-reported questionnaire was filled out by 300 patients visiting to dental clinics in Gyeonggi-do from May to June, 2013. The questionnaire consisted of general characteristics, oral health related characteristics, satisfaction of oral hygiene devices were measured. Results : Halitosis accounted for 11.0% in dental clinic visit. In order to remove halitosis, dental floss is the most satisfactory and effective method of all auxiliary oral hygiene devices. Conclusions : A variety of auxiliary oral hygiene devices are being sold and used to remove halitosis. It is important to choose the most effective oral hygiene devices to remove halitosis.