Papadopoulos Nikolaos, Beindorff Nicola, Hoffmann Stefan, Jost-Brinkmann Paul-Georg, Präger Thomas Michael
Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Institute of Dental and Craniofacial Sciences, Department of Orthodontics, Dentofacial Orthopedics and Pedo.
Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin Experimental Radionuclide Imaging Center (BER.
Korean J Orthod. 2021 Nov 25;51(6):366-374. doi: 10.4041/kjod.2021.51.6.366.
This study investigated the impact of a single piezocision in the maxillary alveolar process on the speed of tooth movement. The null hypothesis was that the speed of tooth movement will be equal with and without piezocision.
All maxillary molars on one side were moved against the combined incisors in 10 ten-week-old male Wistar rats. Under general anesthesia, a force of 25 cN was applied on either side using a Sentalloy closed coil spring. After placing the orthodontic appliance, vertical corticision was performed using a piezotome under local anesthesia, 2 mm mesial from the mesial root of the first molar on a randomly selected side; the other side served as the control. At the beginning of the treatment, and 2 and 4 weeks later, skull micro-computed tomography was performed. After image reconstruction, the distance between the mesial root of the first molar and the incisive canal, and the length of the mesial root of the first maxillary molar were measured. Moreover, the root resorption score was determined as described by Lu et al.
Significantly higher speed of tooth movement was observed on the corticision side; thus, the null hypothesis was rejected. The loss of root length and root resorption score were significantly more pronounced after piezocision than before. A strong correlation was observed between the speed of tooth movement and root resorption on the surgical side, but the control side only showed a weak correlation.
Piezocision accelerates orthodontic tooth movement and causes increased root resorption.
本研究调查了在上颌牙槽突进行单次压电切开术对牙齿移动速度的影响。无效假设是有无压电切开术时牙齿移动速度相同。
对10只10周龄雄性Wistar大鼠一侧的所有上颌磨牙施加力使其向联合切牙移动。在全身麻醉下，使用Sentalloy闭合螺旋弹簧在两侧施加25 cN的力。放置正畸矫治器后，在局部麻醉下使用压电刀在随机选择一侧的第一磨牙近中根近中2 mm处进行垂直骨皮质切开术；另一侧作为对照。在治疗开始时以及2周和4周后，进行颅骨微型计算机断层扫描。图像重建后，测量第一磨牙近中根与切牙管之间的距离以及上颌第一磨牙近中根的长度。此外，按照Lu等人的方法确定牙根吸收评分。
在骨皮质切开术侧观察到明显更高的牙齿移动速度；因此，无效假设被拒绝。压电切开术后牙根长度的减少和牙根吸收评分比术前明显更显著。在手术侧观察到牙齿移动速度与牙根吸收之间有很强的相关性，但对照侧仅显示出较弱的相关性。
压电切开术加速正畸牙齿移动并导致牙根吸收增加。
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