Effectiveness of medical coating materials in decreasing friction between orthodontic brackets and archwires
Arici Nursel, Akdeniz Berat S., Oz Abdullah A., Gencer Yucel, Tarakci Mehmet, Arici Selim,
소속 상세정보
( Arici Nursel ) - Ondokuz Mayis University Faculty of Dentistry Department of Orthodontics
( Akdeniz Berat S. ) - Kirikkale University Faculty of Dentistry Department of Orthodontics
( Oz Abdullah A. ) - Ondokuz Mayis University Faculty of Dentistry Department of Orthodontics
( Gencer Yucel ) - Gebze Technical University Engineering Faculty Materials Science and Engineering Department
( Tarakci Mehmet ) - Gebze Technical University Engineering Faculty Materials Science and Engineering Department
( Arici Selim ) - Ondokuz Mayis University Faculty of Dentistry Department of Orthodontics
Abstract
Objective: The aim of this in vitro study was to evaluate the changes in friction between orthodontic brackets and archwires coated with aluminum oxide (Al2O3), titanium nitride (TiN), or chromium nitride (CrN). In addition, the resistance of the coatings to intraoral conditions was evaluated.
Methods: Stainless steel canine brackets, 0.016-inch round nickel?titanium archwires, and 0.019 × 0.025-inch stainless steel archwires were coated with Al2O3, TiN, and CrN using radio frequency magnetron sputtering. The coated materials were examined using scanning electron microscopy, an X-ray diffractometer, atomic force microscopy, and surface profilometry. In addition, the samples were subjected to thermal cycling and in vitro brushing tests, and the effects of the simulated intraoral conditions on the coating structure were evaluated.
Results: Coating of the metal bracket as well as nickel?titanium archwire with Al2O3 reduced the coefficients of friction (CoFs) for the bracket?archwire combination (p < 0.01). When the bracket and stainless steel archwire were coated with Al2O3 and TiN, the CoFs were significantly lower (0.207 and 0.372, respectively) than that recorded when this bracket?archwire combination was left uncoated (0.552; p < 0.01). The friction, thermal, and brushing tests did not deteriorate the overall quality of the Al2O3 coatings; however, some small areas of peeling were evident for the TiN coatings, whereas comparatively larger areas of peeling were observed for the CrN coatings.
Conclusions: Our findings suggest that the CoFs for metal bracket?archwire combinations used in orthodontic treatment can be decreased by coating with Al2O3 and TiN thin films.
키워드
Thin film coating; Coefficient of friction; Bracket; Archwire
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