Document Type : Full Research Paper

Authors

• Jalil Rezaei Pajand ¹
• Seyed Mohammad Chavoshi ²

¹ Department of Mechanical Engineering, Ferdowsi University of Mashhad

² Department of Orthodontics, Rafsenjan University of Medical Sciences

Abstract

The main objective of this study is to present a mathematical model for frictional forces in orthodontic tooth movements. In order to produce lighter and more efficient sliding movement, good estimation of frictional forces must be determined. For the purpose of analysis, a typical bracket with a circular cross section arch wire is considered with a view to examine the effect of ligation technique (shape), geometry and properties of ligature, and arch wire on the friction forces between ligature and arch wire. Both uniform and non-uniform distributions of contact forces are considered. The result presented herein indicated that, for circular orthodontic arch wires, friction force between ligature and wire is proportional to tensile force in elastomeric ligature. This force is depended on the shape of ligation, material properties and geometries of wire, bracket and ligature.

Keywords

• Ligature
• Friction Force
• Mathematical models
• Circular Orthodoutic Wire
• Tooth Movement

Main Subjects

• Dental Biomechanics