Comparison of Friction Force at Contact Surfaces between the Arch Wire and the Slot of Orthodontic Bracket: a Finite Element Method

Lashgari, Mostafa; Ghalichi, Farzan; Mirzakouchaki, Behnam

doi:10.22041/ijbme.2014.13282

Comparison of Friction Force at Contact Surfaces between the Arch Wire and the Slot of Orthodontic Bracket: a Finite Element Method

Document Type : Full Research Paper

Authors

Mostafa Lashgari ¹

Farzan Ghalichi ²

Behnam Mirzakouchaki ³

¹ M.Sc., Biomedical Engineering Department, Faculty of Mechanical Engineering, Sahand University of Technology

² Professor, Biomedical Engineering Department, Faculty of Mechanical Engineering, Sahand University of Technology

³ Associate Professor, Division of Orthodontics, School of Dentistry, Tabriz University of Medical Sciences

https://doi.org/10.22041/ijbme.2014.13282

Abstract

Orthodontic specialists interest in study of tooth movement mechanic, such as the relationship between applied force and the rate of tooth movement in orthodontic treatment. It is because of the complexity and variety of factors that can affect orthodontic treatment. The friction force at the contact surfaces with an undetermined magnitude, makes the orthodontic treatment unpredictable. In this study, friction coefficient and forces were investigated in new designed bracket that had beveled edge which has been modeled based on standard bracket. Torque, tip and angulations angles of the brackets slot are designed. Arch wires were modeled by two rectangular and circular cross-sections and the effect of geometry on the stress distribution and the friction force was investigated using Finite Element Method (FEM). The results have showed that the stress concentration generated in the bracket which has been the most curvature, decreased compared to the standard bracket at the contact wire and bracket braces. In addition, results have showed that friction in the beveled edge bracket was significantly decline compared to the standard bracket and also are less than the type with minor curvature. Results of investigation of friction between the two types of round and square wire, have revealed that the round wire has lower friction and confirmed previous studies. Finally, due to the reduced friction in the brackets which have been the most curvature, this type of design is appropriate to decrease friction force.

Keywords

Orthodontics bracket

finite element method

Critical contact angle

Friction Force

Curvature in Outlet Edges (COE)

Subjects

[1] S. J. Burrow, "Friction and resistance to sliding in orthodontics: A critical review," American Journal of Orthodontics and Dentofacial Orthopedics, vol. 135, pp. 442-447, 4// 2009.

[2] S. Ehsani, M.-A. Mandich, T. H. El-Bialy, and C. Flores-Mir, "Frictional Resistance in Self-Ligating Orthodontic Brackets and Conventionally Ligated Brackets," The Angle Orthodontist, vol. 79, pp. 592-601, 2009/05/01 2009.

[3] J. H. Marangalou, F. Ghalichi, and B. Mirzakouchaki, "Numerical simulation of orthodontic bone remodeling," Orthodontic Waves, vol. 68, pp. 64-71, 6// 2009.

[4] D. Drescher, C. Bourauel, and H.-A. Schumacher, "Frictional forces between bracket and arch wire," American Journal of Orthodontics and Dentofacial Orthopedics, vol. 96, pp. 397-404, 11// 1989.

[5] S. Tecco, D. Di Iorio, G. Cordasco, I. Verrocchi, and F. Festa, "Corrigendum An in vitro investigation of the influence of self-ligating brackets, low friction ligatures, and archwire on frictional resistance," Eur J Orthod, vol. 30, pp. 110-, February 1, 2008 August 1, 2007 2008.

[6] N. Reznikov, G. Har-Zion, I. Barkana, Y. Abed, and M. Redlich, "Measurement of friction forces between stainless steel wires and “reduced-friction” self-ligating brackets," American Journal of Orthodontics and Dentofacial Orthopedics, vol. 138, pp. 330-338, 9// 2010.

[7] C. A. Frank and R. J. Nikolai, "A comparative study of frictional resistances between orthodontic bracket and arch wire," American Journal of Orthodontics, vol. 78, pp. 593-609, 12// 1980.

[8] B.-S. Kang, S.-H. Baek, J. Mah, and W.-S. Yang, "Three-dimensional relationship between the critical contact angle and the torque angle," American Journal of Orthodontics and Dentofacial Orthopedics, vol. 123, pp. 64-73, 1// 2003.

[9] A. Boccaccio, "Friction Forces during Sliding of Various Brackets for Malaligned Teeth: An In Vitro Study," The Scientific World Journal, vol. 2013, 2013.

[10] L. Franchi, T. Baccetti, M. Camporesi, and E. Barbato, "Forces released during sliding mechanics with passive self-ligating brackets or nonconventional elastomeric ligatures," American Journal of Orthodontics and Dentofacial Orthopedics, vol. 133, pp. 87-90, 1// 2008.

[11] J. R. Bednar, G. W. Gruendeman, and J. L. Sandrik, "A comparative study of frictional forces between orthodontic brackets and arch wires," American Journal of Orthodontics and Dentofacial Orthopedics, vol. 100, pp. 513-522, 12// 1991.

[12] J. K. Lancaster, "ASM handbook, volume 18, friction, lubrication and wear technology: Volume chairman, Peter J. Blau," Tribology International, vol. 26, pp. 293-294, 8// 1993.