Third Day Poster Session, 17 June 2010 - NanoTR-VI

P
461–464.
Poster Session, Thursday, June 17
Theme F686 - N1123
The Effect of TiCN Coatings on Frictional Properties of Orthodontic Archwires
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Uengül DanmanUP P*, Soner SavaP P, Gülfem IkP P, Tancan UysalP Pand Ahmet YacP
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PErciyes University, Kayseri-Turkey
Abstract-One of the main problems in the orthodontic treatment is the frictional forces on the archwires. The geometry of an archwire and the
coatings applied on archwires affect these forces. In this study, the archwires were coated with TiCN by using dc reactive magnetron sputtering
method. It was found that the coefficient of frictions of the TiCN coated archwires were much lower than those of uncoated archwires.
Hard ceramic coatings deposited by PVD (Physical Vapour
Deposition) techniques have been widely used in different
industries because of their excellent coating properties: high
hardness, good wear, corrosion and oxidation resistance,
chemical resistance and good adhesion to the substrate. Today,
in the field of biomedical applications - such as surgical tools,
implants, lenses, stents, and materials used in dentistry - Ti,
TiN, ZrN, TiAlN, DLC, etc. are successfully used as single or
multilayered or nanolayered coatings. These coatings also
have good bio-conformity with the human body [1-6].
The objective of this study was to shorten the active
treatment time in the orthodontic treatment by reducing the
static and dynamic friction between the brackets and
archwires. It was clearly seen that the friction was affected not
only archwire geometry and materials but also surface quality
of archwires. Today, esthetic brackets are preferred to the
traditional ones and, therefore, frictional forces on archwires
are increased. These forces affect the movement of the
archwire and extend the duration of the treatment. Therefore,
low frictional coatings are very important for orthodontic
archwires.
In this study, the archwires were coated with TiCN by using
dc reactive magnetron sputtering method with the optimum
deposition parameters. The dynamic and static frictional
forces and surface roughnesses of the TiCN-coated and
uncoated archwires (NiTi, BTi (TMA) and stainless steel
archwires, 0.017"x0.025" and Ø0.016" in dimensions) were
measured. Then, the friction coefficients of TiCN coated and
uncoated archwires were determined by using CSEM tester
under the frictional forces (10 mm/min progress speed and 10
N load were used as test parameters) and the results were
discussed comparatively.
The friction tests showed that TiCN coated archwires had
lower coefficient of friction values than those of uncoated
archwires. The coefficient of frictions of the TiCN coated B-
Ti, Ni-Ti archwires as shown in the Fig.1b were found
superior to the stainless steel in spite of the roughness of
stainless steel was lower than the others (Figure 1a). In the
literature it was not encountered that friction and roughness
was definitely related each other [1-7].
These findings indicate that TiCN coated B-Ti archwire
showed lowest friction coefficient but these results are near
the values of TiCN coated Ni-Ti archwires. The obtained
results are in good agreement with the literature.
Figure 1. a) RRaR surface roughness, b) coefficient of friction values of
the coated and uncoated archwires of different geometry.
This study was supported by the Office of Scientific Research
Projects in Erciyes University (Project no: FBT-09853).
*Corresponding author: sdanisman@erciyes.edu.tr
T[1] TProbst, J., Gbureck, UT., Thull, R., 2001, Surface and Coatings
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88.
T[3] TPaschoal, A.L., Vanânco, E.C., Canale L.C.F., Slva, O.L.,
Huerta-Vlca, D., Motheo A.J., 2003T, 27 (5), T
[4] Kobayashi, S., Ohgoe, Y., Ozeki, K., Sato, KT., Sumya, T.,
Hrakur, K.K., H. Aok, H., 2005, 14, 1094– 1097.
T[5] Ohgoe, Y. et al., T2006, Thin Solid Films, 497, 218–222.
[6] Redlich, M., Katz, A., Rapoport, L., T Wagner, H.D., Feldman Y.,
Tenne RT., T2008,T TDental Materials, Article in Pres.
T[7] Kusy, R.P., Whitley, J.Q., Mayhew, M.J., Buckthal, J.E., 1988,
Angle Orthod., 58 (1), 33-45.
6th Nanoscience and Nanotechnology Conference, zmir, 2010 743