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교정용 와이어 및 브라켓에 이산화티탄 광촉매 코팅 시 코팅방법에 따른 비교연구

A comparative study of physical properties of TiO2 thin films according to a coating method on orthodontic wires and brackets

조진형|고은희
대한치과교정학회 (The Korean Association Of Orthodontists)|2006.12|대한치과교정학회지 (The Korean Journal of Orthodontics)|제36권 제6호|pp. 451-464

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참고문헌

키워드

CVDTiO2이산화티탄PE-CVD코팅방법CVD법Coating method
주제분류치의학

초록

본 연구는 항균 교정장치의 개발에 도움이 되고자 이산화티탄 광촉매의 코팅 시 안정적이고 효과적인 방법을 찾기 위하여 시행되었다. 시판되고 있는 교정용 와이어와 브라켓에 sol-gel법, CVD (Chemical Vapor Deposition)법 및 PE-CVD (Plasma Enhanced-CVD)법으로 이산화티탄을 각각 코팅한 다음 각 방법으로 코팅된 이산화티탄 박막의 특성을 알아보고자 주사전자현미경을 이용하여 각 시편의 코팅박막 표면의 거칠기를 관찰하였고 adhesive tape pull test를 이용하여 코팅박막의 접착강도를 측정하였다. 메틸렌블루용액에 각 시편을 침지시킨 후 시간경과에 따른 메틸렌블루용액의 농도변화 측정을 통해 코팅박막의 분해능을 평가하였으며 불화나트륨 용액에 각 시편을 침지시킨 후 주사전자현미경을 이용하여 표면부식 정도를 관찰함으로써 불소화합물에 대한 내부식성을 평가하여 다음과 같은 결과를 얻었다. 코팅박막의 표면은 CVD법 및 PE-CVD법이 sol-gel법이나 코팅되지 않은 시편에 비해 더 매끄러웠다. 코팅박막의 접착강도는 PE-CVD법이 가장 높았고, CVD법, sol-gel법의 순으로 낮게 나타났다. 코팅박막의 메틸렌블루 분해능은 PE-CVD법이 가장 높았고, CVD법, sol-gel법의 순으로 낮게 나타났다. 코팅박막의 불소화합물에 대한 내부식성은 CVD법 및 PE-CVD법이 sol-gel법에 비해 높게 나타났다. 이상의 결과는 교정용 와이어 및 브라켓의 이산화티탄 광촉매 코팅 시 CVD법 및 PE-CVD법이 sol-gel법보다 적절한 방법임을 시사하였다. (대치교정지 2006;36(6):451-64)

Abstract

The purpose of this study was to search for an appropriate method of coating TiO2 on orthodontic appliances. TiO2 thin films were deposited on orthodontic wires and brackets using sol-gel, CVD (Chemical Vapor Deposition) and PE-CVD (Plasma Enhanced-CVD) methods. The roughness of TiO2-coated surfaces was investigated via scanning electron microscope (SEM) and adhesive strength of TiO2 thin films was measured by adhesive tape pull test. Methylene blue degradation test was carried out to evaluate the photocatalytic activity of TiO2 and the corrosion resistance of TiO2 thin films against fluoride solution was also analyzed by observing the surfaces of TiO2-coated wires and brackets via SEM after immersion in sodium fluoride solution. Through the comparison of properties and photocatalytic activity of TiO2 thin films according to the coating methods, the following results were obtained. Smoother surfaces of TiO2 thin films were generated by CVD or PE-CVD methods than through the sol-gel method or the control. Adhesive strength of the TiO2 thin films was highest in PE-CVD and gradually became lower in the order of CVD, then the sol-gel method. Photocatalytic activity of TiO2 thin films on methylene blue was the highest in PE-CVD and gradually became lower in the order of CVD, then the sol-gel method. Corrosion resistance of TiO2 thin films against fluoride solution was stronger in CVD and PE-CVD methods than in the sol-gel method. The results of this study suggest that the CVD or PE-CVD methods is more appropriate than the sol-gel method for TiO2 coating on orthodontic wires and brackets.(Korean J Orthod 2006;36(6):451-64)

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