Date of Graduation
School of Dentistry
Michael D. Bagby.
Friction and binding occur in orthodontics during sliding mechanics. This paper evaluated the influence of a variable moment, simulating mastication, placed at the bracket-archwire interface to determine its effects on friction. Friction of self-ligating brackets were also compared to stainless steel and ceramic brackets. Six archwires were combined with four brackets. Friction (static, kinetic and dynamic) and load (dynamic and apparent stiffness) were measured. Dynamic friction was the frictional force that occurred when the applied force was variable (dynamic load). The results showed that static and kinetic friction were similar while dynamic friction was statistically greater. The Minitwin and Transcend 6000 brackets produced greater friction than the In-Ovation and Damon 2 brackets for all archwires, except with the 19 x 25TMA archwire. The Damon 2 bracket yielded the least friction. Dynamic friction was momentarily reduced below kinetic friction; thus, releasing the binding and enabling tooth movement.
Mah, Edward, "Investigation of frictional resistance on orthodontic brackets when subjected to variable moments" (2002). Graduate Theses, Dissertations, and Problem Reports. 1539.