Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403


한국표면공학회지 (43권3호 132-141)

Surface Characteristics of Polymer Coated NiTi Alloy Wire for Orthodontics

폴리머 코팅된 NiTi합금 교정선의 표면특성

Cho, Joo-Young;Kim, Won-Gi;Choi, Hwan-Suk;Lee, Ho-Jong;Choe, Han-Cheol;

조선대학교 치의학전문대학원 치과재료학교실 및 생체재료나노계면활성화센터;순천대학교 공과대학 미래전략신소재공학;
Department of Dental Materials & Research Center of Nano-Interface Activation for Biomaterials, School of Dentistry, Chosun University;Department of Materials Science & Metallurgical Engineering, Sunchon National University;

DOI : 10.5695/JKISE.2010.43.3.132


NiTi alloy has been used for orthodontic wire due to good mechanical properties, such as elastic strength and frictional resistance, combined with a high resistance to corrosion. Recently, these wire were coated by polymer and ceramic materials for aesthetics. The purpose of this study was to investigate surface characteristics of polymer coated NiTi alloy wire for orthodontics using various instruments. Wires (round type and rectangular type) were used, respectively, for experiment. Polymer coating was carried out for wire. Specimen was investigated with field emission scanning electron microscopy(FE-SEM), energy dispersive x-ray spectroscopy(EDS) and atomic force microscopy(AFM). The phase transformation of non-coated NiTi wire from martensite to austenite occurred at the range of $14{sim}15^{circ}C$, in the case of coated wire, it occurred at the range of $16{sim}18^{circ}C$. Polymer coating on NiTi wire surface decreased the surface defects such as scratch which was formed at severe machined surface. From the AFM results, the average surface roughness of non-coated and coated NiTi wire was 13.1 nm, and 224.5 nm, respectively. From convetional surface roughness test, the average surface roughness of non-coated and coated NiTi wire was $0.046{mu}m$, and $0.718{mu}m$, respectively.


NiTi wire;TMDSC;Polymer;Surface roughness;Phase transformation;