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首页> 外文期刊>Australian Dental Journal >Effects of pulsed electromagnetic field vibration on tooth movement induced by magnetic and mechanical forces: a preliminary study.
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Effects of pulsed electromagnetic field vibration on tooth movement induced by magnetic and mechanical forces: a preliminary study.

机译：脉冲电磁场​​振动对磁力和机械力引起的牙齿运动的影响：初步研究。

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BACKGROUND: This study was designed to determine whether or not high-frequency and low-magnitude vibration affects orthodontic tooth movement caused by magnetic or/and mechanical forces. METHODS: Forty-four 7-week-old Wistar rats were randomly divided into four groups, with each group further divided into experimental and control subgroups. Neodymium-Iron-Boron (Nd-Fe-B) magnets and Sentalloy closed coil springs were placed between maxillary or mandibular first molars and incisors to activate tooth movement. The animals of experimental subgroups were exposed to the vibration induced by pulsed electromagnetic fields (PEMF) whilst the control subgroups were under normal atmosphere. The experiment lasted for 14 days and all of the animals were sacrificed for examination. The changes in the space between the molar and incisor were measured to indicate the amount of tooth movement. RESULTS: The coil springs, either with sham or active magnets, move molar much more than magnets alone, regardless of absence or presence of PEMF (p < 0.001). Under PEMF, the coil spring moved significantly more amount of tooth movement than that of coil-magnet combination (p < 0.01), as did the magnets compared to sham magnets (p < 0.019). Under a non-PEMF scenario, there was no significant difference in tooth movement between coil spring and coil-magnets combination, nor was there difference between magnets and sham magnets. CONCLUSIONS: It is suggested that the PEMF-induced vibration may enhance the effect of mechanical and magnetic forces on tooth movement.
机译：背景：本研究旨在确定高频和低幅振动是否会影响由磁力或机械力引起的正畸牙齿运动。方法：将44只7周龄的Wistar大鼠随机分为四组，每组进一步分为实验组和对照组。钕铁硼（Nd-Fe-B）磁铁和Sentalloy闭合螺旋弹簧置于上颌或下颌第一磨牙和切牙之间，以激活牙齿运动。实验亚组的动物暴露于脉冲电磁场​​（PEMF）诱导的振动中，而对照组则在正常大气下。实验持续了14天，并处死了所有动物进行检查。测量臼齿和门齿之间的空间变化，以表明牙齿移动的量。结果：无论是否存在PEMF，带有假磁铁或有源磁铁的螺旋弹簧的移动摩尔比比单独磁铁多得多（p <0.001）。在PEMF的作用下，与假磁铁（p <0.019）相比，螺旋弹簧的齿移动量远大于线圈-磁铁组合（p <0.01）。在非PEMF情况下，螺旋弹簧和螺旋磁铁之间的齿运动没有显着差异，假磁铁和假磁铁之间也没有差异。结论：建议由PEMF引起的振动可能会增强机械力和磁力对牙齿运动的影响。

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