|
KMID : 0361920070370060432
|
|
Korean Journal of Orthodontics
2007 Volume.37 No. 6 p.432 ~ p.439
|
|
|
The effect of temperature changes on force level of superelastic nickel-titanium archwires
|
|
Chun Kyoung-Ae
Kim Kwang-Won
Lim Sung-Hoon
|
|
|
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.
Methods:Nickel-titanium archwires of $0.016"{\times}0.022"$ thickness were tested with a three point bending test setup, and temperature changes were applied. The force level changes according to temperature changes were measured at a 1.5 mm deflection during the loading phase and a 1.5 mm deflection during the unloading phase from a deflection to 3.1mm. Ten cycles of thermal cycling from baseline $(37^{\circ}C)$ to cold $(20^{\circ}C)$ or hot $(50^{\circ}C)$temperature were applied.
Results: Alter thermal cycling, the force level during the loading phase decreased and the force level during the unloading phase increased even after the temperature was changed to the initial $37^{\circ}C$.
Conclusion: The results suggest that the orthodontic force level can not return to the initial force level after temperature changes. When applying superelastic nickel-titanium archwires, we must consider that a lighter force than the loading force and a heavier force than the unloading force will be applied after intraoral temperature changes caused by eating and drinking.
|
|
|
KEYWORD
|
|
|
Nickel-titanium, Super-elasticity, Intraoral temperature change
|
|
|
FullTexts / Linksout information
|
|
 
|
|
|
Listed journal information
|
|
  
|