2011年1月
Effects of a diamond-like carbon coating on the frictional properties of orthodontic wires
Angle orthodontist
- ,
- ,
- ,
- 巻
- 81
- 号
- 1
- 開始ページ
- 141
- 終了ページ
- 148
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.2319/052110-276.1
- 出版者・発行元
- E H ANGLE EDUCATION RESEARCH FOUNDATION, INC
Objective: To test the hypothesis that a diamond-like carbon coating does not affect the frictional properties of orthodontic wires.
Materials and Methods: Two types of wires (nickel-titanium and stainless steel) were used, and diamond-like carbon (DLC) films were deposited on the wires. Three types of brackets, a conventional stainless steel bracket and two self-ligating brackets, were used for measuring static friction. DLC layers were observed by three-dimensional scanning electron microscopy (3D-SEM), and the surface roughness was measured. Hardness and elastic modulus were obtained by nanoindentation testing. Frictional forces and surface roughness were compared by the Kruskal-Wallis and Mann-Whitney U-tests. The hardness and elastic modulus of the wires were compared using Student's Hest.
Results: When angulation was increased, the DLC-coated wires showed significantly less frictional force than the as-received wires, except for some wire/bracket combinations. Thin DLC layers were observed on the wire surfaces by SEM. As-received and DLC-coated wires had similar surface morphologies, and the DLC-coating process did not affect the surface roughness. The hardness of the surface layer of the DLC-coated wires was much higher than for the as-received wires. The elastic modulus of the surface layer of the DLC-coated stainless steel wire was less than that of the as-received stainless steel wire, whereas similar values were found for the nickel-titanium wires.
Conclusions: The hypothesis is rejected. A DLC-coating process does reduce the frictional force. (Angle Orthod. 2011;81:141-148.)
Materials and Methods: Two types of wires (nickel-titanium and stainless steel) were used, and diamond-like carbon (DLC) films were deposited on the wires. Three types of brackets, a conventional stainless steel bracket and two self-ligating brackets, were used for measuring static friction. DLC layers were observed by three-dimensional scanning electron microscopy (3D-SEM), and the surface roughness was measured. Hardness and elastic modulus were obtained by nanoindentation testing. Frictional forces and surface roughness were compared by the Kruskal-Wallis and Mann-Whitney U-tests. The hardness and elastic modulus of the wires were compared using Student's Hest.
Results: When angulation was increased, the DLC-coated wires showed significantly less frictional force than the as-received wires, except for some wire/bracket combinations. Thin DLC layers were observed on the wire surfaces by SEM. As-received and DLC-coated wires had similar surface morphologies, and the DLC-coating process did not affect the surface roughness. The hardness of the surface layer of the DLC-coated wires was much higher than for the as-received wires. The elastic modulus of the surface layer of the DLC-coated stainless steel wire was less than that of the as-received stainless steel wire, whereas similar values were found for the nickel-titanium wires.
Conclusions: The hypothesis is rejected. A DLC-coating process does reduce the frictional force. (Angle Orthod. 2011;81:141-148.)
- リンク情報
- ID情報
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- DOI : 10.2319/052110-276.1
- ISSN : 0003-3219
- PubMed ID : 20936967
- Web of Science ID : WOS:000285984000020