Abstract
ObjectivesThe aim of this study was to clarify the effect of the play between the bracket and the archwire on anterior tooth movement subjected to the retraction force from various lengths of power arms in sliding mechanics.Materials and MethodsA three-dimensional finite element method was used to simulate en masse anterior tooth retraction in sliding mechanics. The displacements of the maxillary incisor and the archwire deformation were calculated when the retraction force was applied.ResultsWhen a play did not exist, bodily movement was obtained at 5.0 mm length of power arm. In case a play existed, bodily movement was observed at the power arm length of 11.0 mm.ConclusionsIn the actual clinical situation, a bracket/archwire play and the torsion of the archwire within the bracket slot should be taken into consideration to prescribe an optimal power arm length and to achieve effective anterior tooth movement.
Highlights
In recent years, the demand for speedy, effective, and accurate orthodontic treatment system has been increasing
Several calculations have been made by using the finite element method (FEM) on tooth displacement in a situation, in which single canine retraction or en masse retraction is performed in sliding mechanics
The purpose of this study was to clarify the effect of the play between the bracket and the archwire on anterior tooth movement subjected to a retraction force and how power arms affect the archwire deformation and the controlled movement of anterior teeth in sliding mechanics by means of three-dimensional (3D) FEM
Summary
The demand for speedy, effective, and accurate orthodontic treatment system has been increasing In such background, sliding mechanics in combination with implant anchorage has become more and more applicable all around the world.[1,2,3,4,5,6,7,8] the mechanics of the system for achieving the desired tooth movement during space closure in sliding mechanics has not been established. The purpose of this study was to clarify the effect of the play between the bracket and the archwire on anterior tooth movement subjected to a retraction force and how power arms affect the archwire deformation and the controlled movement of anterior teeth in sliding mechanics by means of three-dimensional (3D) FEM
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