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Effect of silver addition on the properties of nickel–titanium alloys for dental application

Authors
 Keun-Taek Oh  ;  Uk-Hyon Joo  ;  Gee-Ho Park  ;  Chung-Ju Hwang  ;  Kyoung-Nam Kim 
Citation
 JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS, Vol.76B(2) : 306-314, 2006 
Journal Title
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS
ISSN
 1552-4973 
Issue Date
2006
MeSH
Animals ; Biocompatible Materials/chemistry ; Cell Line ; Corrosion ; Dental Alloys/chemistry* ; Hardness Tests ; Materials Testing ; Mice ; Nickel/chemistry* ; Silver/chemistry* ; Surface Properties ; Titanium/chemistry* ; X-Ray Diffraction
Keywords
shape memory ; superelasticity ; nickel–titanium alloy ; silver ; corrosion resistance
Abstract
Equiatomic and near-equiatomic nickel-titanium alloys exhibit a shape-memory effect and superelasticity. However, the properties of such alloys are extremely sensitive to the precise nickel-titanium ratio and the addition of alloying elements. High corrosion resistance is necessary for biomedical applications, especially orthodontic. The purpose of this study was to investigate the effect of silver addition to nickel-titanium alloys for dental and medical application. Arc melting, homogenization, hot rolling, and solution heat treatment were performed to prepare the nickel-titanium-silver (NiTi-Ag) specimens. The properties of the ternary NiTi-Ag alloys such as phase-transformation temperature, microstructure, microhardness, corrosion resistance, and cytotoxicity were investigated. The NiTi-Ag alloys showed low silver recovery rate for the cast alloy, due to silver's low evaporation temperature, and low silver solubility in nickel-titanium. Silver addition to nickel-titanium increased the transition temperature range to 100 degrees C and stabilized the martensitic phase (monoclinic structure) at room temperature, because the martensitic transformation starting temperature (Ms) was above room temperature. Martensitic and austenitic phases existed in X-ray diffraction patterns of solution-annealed NiTi-Ag alloys. The silver addition was considered to improve the corrosion resistance and form a stable passive film. Significantly, the mechanical properties of the silver-added alloys were dependent upon the amount of alloying addition. There was no toxicity in the NiTi-Ag alloys, as the response index showed none or mild levels.
Full Text
http://onlinelibrary.wiley.com/doi/10.1002/jbm.b.30369/abstract
DOI
10.1002/jbm.b.30369
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Dental Biomaterials and Bioengineering (치과생체재료공학교실) > 1. Journal Papers
2. College of Dentistry (치과대학) > Dept. of Orthodontics (교정과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Kyoung Nam(김경남)
Hwang, Chung Ju(황충주) ORCID logo https://orcid.org/0000-0003-3024-4551
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/110553
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