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KMID : 0362219950220020175
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Journal of The Korean Research Society for Dental Materials
1995 Volume.22 No. 2 p.175 ~ p.186
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A COMPARATIVE STUDY ON THE FRICTIONAL FORCES BETWEEN ORTHODONTIC WIRES AND BRACKETS
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Lee Yong-Keun
Park Young-Jun
Kim Cheol-We
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Abstract
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Mechanical friction makes the orthodontic tooth movement require greater force than the biological tooth movement. Friction is affected by the size, shape, and material of both the bracket and the wire.
This study was designed to investigate the effect of material or size of orthodontic brackets and orthodontic wires on the amount of frictional forces generated during simulated tooth movement. A testing apparatus was designed to simulate the clinical situation in which the center of resistance of a tooth is not on the same plane as that of bracket, thereby resulting in some tipping of the bracket slot relative to orthodontic wire (100 gram weight was suspended). In angulated and non-angulated experimental condition, the orthodontic wires were drawn through the testing apparatus with the speed of 2mm/minute.
The results were as follows :
1. In both of the cases of the metal bracket and ceramic bracket, the frictional forces were greater in angulated experimental group than non-angulated group. In both of the non-angulated and angulated experimental group, the frictional forces of ceramic brackets were greater than those of metal brackets. In most of cases, these differences were statistically significant(p<0.05) with a few exceptions.
2. In general, the frictional forces of orthodontic wires with circular cross-cut surface were lower than those wires with rectangular cross-cut surfaces. But there was no statistically significant correlation between the size of orthodontic wire and frictional forces.
3. There was no difference between the frictional of the stainless-steel orthodontic wires and those of the cobalt-chromium orthodontic wires, but the frictional forces varied depending on the measuring condition or brand of the wires.
4. The frictional forces of β-titanium orthodontic wires were significantly higher than those of stainless-steel orthodontic wires were cobalt-chromium orthodontic wires.
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