온도변화가 교정용 니켈-티타늄 호선의 하중값에 미치는 영향

Abstract

The purpose of this study was to evaluate the influence of intraoral temperature changes on the orthodontic force level of a superelastic nickel-titanium alloy wire. 0.016???~ 0.022??nickel-titanium archwires (SentalloyⓇ) were tested with three point bending test setup, and temperature changes were applied. The force level changes according to temperature changes were measured at 1.5 mm deflection during loading phase. and 1.5 mm deflection during unloading phase from deflection to 3.1 mm. 10 cycles of thermal cycling from baseline (37??) to cold (20??) or hot (50??) temperature were applied. After thermal cyclings, the force level during loading phase decreased and the force level during unloading phase increased even after the temperature was changed to initial 37??. The orthodontic force level can not return to initial force level after temperature changes. When applying superelastic nickel-titanium archwires, it must be considered that lighter force than the loading force and heavier force than the unloading force of load-deflection data will be applied after intraoral temperature changes caused by eating and drinking.