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首页> 外文期刊>American Journal of Orthodontics and Dentofacial Orthopedics >Short-term temperature changes influence the force exerted by superelastic nickel-titanium archwires activated in orthodontic bending.
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Short-term temperature changes influence the force exerted by superelastic nickel-titanium archwires activated in orthodontic bending.

机译：短期温度变化会影响在正畸弯曲中激活的超弹性镍钛弓丝施加的力。

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摘要

BACKGROUND: Alterations in mouth temperature may lead to changes in the force exerted by an activated superelastic wire. It has been assumed that variations in archwire stiffness associated with short-term cooling or heating are transient. This investigation studied the effect of short-term cooling or heating on the bending force exerted by nickel-titanium archwire. MATERIAL AND METHODS: Six rectangular superelastic wires and one conventional nickel-titanium wire were tested in bending at 37 degrees C. The test specimens were deflected 0.5 mm, and the bending force was measured continually. The activated specimens were subjected to cold (10 degrees C) or hot (80 degrees C) water under constant deflection, simulating an inserted archwire that is subjected to cold or hot drinks or food during a meal. RESULTS: The conventional nickel-titanium wire was marginally affected by brief cooling or heating. In contrast, some of the superelastic wires were strongly affected by short-time application of cold or hot water. Whereas the effect of brief heating disappeared quickly, some wires continued to exert sub-baseline bending forces (up to 32% less) after short-time application of cold water and showed little or no tendencies toward increase even after 30 minutes of postexposure restitution (up to 43% less). CONCLUSIONS: Short-term exposures to hot liquid increased the bending force exerted for a given deflection transiently. The effect of short-term exposures to cold liquid was not always transient; the bending force remained sub-baseline for a number of the thermosensitive wires tested for a prolonged time.
机译：背景：口腔温度的变化可能会导致激活的超弹力线施加的力发生变化。已经假定与短期冷却或加热相关的弓丝刚度的变化是瞬时的。这项研究研究了短期冷却或加热对镍钛弓丝施加的弯曲力的影响。材料与方法：测试了6条矩形超弹性线和1条常规的镍钛线在37摄氏度下的弯曲度。将试样挠曲0.5 mm，并连续测量弯曲力。激活的标本在恒定挠度下经受冷（10摄氏度）或热水（80摄氏度）的作用，模拟插入的弓丝，在进餐过程中受到凉或热的饮料或食物。结果：常规的镍钛丝受到短暂冷却或加热的影响很小。相反，某些超弹性线材受到短时间冷水或热水的强烈影响。尽管短暂加热的效果很快消失，但一些金属丝在短时间施加冷水后仍继续施加亚基线弯曲力（最多降低32％），即使在暴露后恢复30分钟后，也几乎没有或没有增加的趋势（最多减少43％）。结论：短期暴露于热液体中会暂时增加给定挠度施加的弯曲力。短期暴露于冷液体的影响并不总是短暂的。对于长时间测试的多条热敏线，弯曲力仍保持低于基线。

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