Frictional forces occured between tube, bracket or elastics and archwires by fixed orthodontic appliance prevent from tooth movement, and can be changed by several factors as the area of the contact surface, normal forces, and the form of the contact surface
This study was about frictional forces from the species of the bracket(metal bracket, plastic bracket), the species of the wire(stainless steel, Elgiloy, TMA) and the diameter of the wire(.016 inch, .018 inch), and energy produced by movement of the wire on the bracket to 2.5㎜ under the dry condition.
The results were as follows :
1. Frictional force from the plastic bracket was larger than that from the metal bracket.
2. Frictional force from the .018 inch wire was larger than that from the .016 inch wire.
3. Frictional force from the species of the orthodontic wire was increased in turn as stainless steel. Elgiloy and TMA.
4. The dimensional difference of frictional force occured from the species of the orthodontic wire was larger at metal bracket than at palstic bracket, and the dimensional difference of frictional force occured from the diameter was larger at plastic bracket than at metal bracket.
5. The least frictional force was seen in the .016 inch stainless steel wire on the metal bracket.
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