교정용 브라켓과 교정선 사이의 마찰력
Evaluation of frictional forces between orthodontic brackets and archwires
조준형, 박종명,
소속 상세정보
조준형 ( ) - 가톨릭대학교 치과대학
박종명 ( ) - 가톨릭대학교 치과대학
KMID : 0361920000300050613
Abstract
The purpose of this study was to amount of the frictional forces with the brackets and wires, ligation methods, dry/wet, offsets, interbracket´ distances, velocity and to compare them each other by different conditions.
This study tested 0.018"X0.025" slot sized 8 types of orthodontic bracket systems and 0.016", 0,016" X 0.022" sized stainless steel, NiTi, Cu-NiTi orthodontic wires. One cuspid bracket were positioned on the slide glass and archwire was engaged into bracket and ligated with elastomeric modules. The values of frictional forces were measured with the Instron universal testing machine.
The results were as follows;
1. Polycrystalline ceramic bracket had the highest mean frictional forces and followed and by ceramic reinforced plastic bracket, metal bracket, plastic bracket with metal slot, monocrystalline ceramic bracket, single bracket, self-ligating bracket, friction free bracket in descending order. The self-ligating bracket showed low frictional forces in the round wires and high frictional forces in the rectangular wires.
2. Stainless steel wires had the least frictional forces and followed by NiTi, Cu-NiTi wires in descending order. Round wires had lower frictional forces then that of rectangular wires.
3. The stainless steel ligation method had significantly greater mean frictional forces them the elastomeric module ligation method.
4. Artificial saliva statistically increased the frictional forces in stainless steel wire, NiTi wire and Cu-NiTi wire. 5. There was a statistically significant difference with offset change.
6. There was no statistically significant difference with interbracket distance in stainless steel wires but a significant difference in NiTi wires as the interbracket was decreased.
T There was no statistically significant difference with velocity chang.
From the above findings, self-ligating bracket, Stainless steel wires and the elastomeric module ligation method might be
effective than any other materials to reduce the frictional forces in the orthodontic treatment and can be correlated to clinical situations seen in orthodontic patient care.
키워드
브라켓;교정선;평균마찰력;Frictional forces;Bracket;Archwire
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