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교정용 BRACKET과 ARCHWIRE 사이의 마찰저항에 대한 비교 연구
COMPARISON OF THE FRICTIONAL RESISTANCE BETWEEN ORTHODONTIC BRACKET & ARCHWIRE

Korean Journal of Orthodontics 1991년 21권 3호 p.543 ~ 560

성현미, 박영철,

소속 상세정보

성현미 ( ) - 연세대학교 치과대학 교정학교실
박영철 ( ) - 연세대학교 치과대학 교정학교실

KMID : 0361919910210030543

Abstract

Practitioners are aware of the presence of friction between bracket system and archwire during sliding movement of teeth. Clinically a mesiodistally applied force must exceed the frictional force to produce a tooth movement.
The objective of this study were to determine, on a dry condition, changes in magnitude of friction with respect to load, 3rd order inclination (Torque), archwire materials and ligature type.
Three wire alloys (Stainless Steel, TMA, NiTi) in two wire sizes (.016, .016x, .022 inch) were examined respect to two bracket system (Straight, Standard),.and two ligature type (Metal,Plastic ligature) at three levels of load (100g, 150g, 200g).
The results were as follows;
I . Frictional resistance was found to increase with increasing load for S.S., TMA, NiTi.
2. The straight bracket system was exhibited more frictional force than standard bracket system
for .016x, .022 S.S. tightly ligated metal ligature. But, torque difference did not increase
friction for loose metal ligature & plastic ligature.
3. Regardless of the ligature type, torque and load, stainless steel wire sliding against stainless steel exhibited the lowest friction, and TMA sliding against stainless steel exhibited the highest friction.
4. The loose stainless steel ligature generated lower frictional resistance than plastic ligature in all experimental groups.
5. The following factors affected friction in decreasing order; wire material ligature type, and load.