In vitro study of friction in orthodontic mechanotherapy
Date
1993
DOI
Authors
Haber, Isaac B.
Version
OA Version
Citation
Abstract
Friction is one of the factors that affects the rate of tooth movement when a force is applied to a tooth. When tooth movement occurs by sliding a tooth on a continuous arch-wire, friction is produced between the bracket and arch wire, tending to resist movement of the tooth in the desired direction. To obtain tooth movement, frictional force must be overcome. Each time force is applied to the tooth, part of that force is transmitted to the supporting structures, and another part is lost due to friction. Consequently, the forces applied to a tooth have to be greater in the presence of friction in order to achieve tooth movement. Several variables affect the levels of friction between bracket and arch-wire. Some of this variables are type and force of ligation, arch wire material, surface roughness, arch wire dimension, bracket material, bracket width, bracket slot dimensions, salivary lubrication, interbracket distances, bracket/wire angulation and corrosion.
Friction can be either static or kinetic. Static friction deals with the force needed to start movement, while kinetic friction deals with the force required to maintain movement once movement has started. The first objective of this investigation was to observe the effects of ligature material, wire material, wire dimension, and bracket material on friction by measuring the maximum static frictional force required to pull a wire through a bracket in a straight line. The second objective of this investigation is to observe the effects of bracket/wire angulation on friction by measuring the kinetic frictional force required for sliding a wire through a bracket at various degrees of angulation.
Description
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Thesis (M.Sc.D.)--Boston University, Henry M. Goldman School of Graduate Dentistry, 1993.
Includes bibliographic references (leaves 144-150)
Thesis (M.Sc.D.)--Boston University, Henry M. Goldman School of Graduate Dentistry, 1993.
Includes bibliographic references (leaves 144-150)
License
This work is protected by copyright. Downloading is restricted to the BU community. If you are the author of this work and would like to make it publicly available, please contact open-help@bu.edu.