Reichert Christoph, Wenghöfer Matthias, Götz Werner, Jäger Andreas
Department of Orthodontics, University of Bonn, Germany.
J Orofac Orthop. 2011 Mar;72(1):45-50. doi: 10.1007/s00056-010-0006-z.
In the present study, the benefit of moving teeth into extraction sockets preserved by a bone substitute was evaluated. This was performed to determine whether this was advantageous for orthodontic space closure.
Socket preservation employing the bony alveolus in patients presenting the orthodontic indication for premolar extraction therapy was performed. Analogue premolars were extracted in a split-mouth design. One extraction alveolus was filled with a silica matrix-embedded, nanocrystalline hydroxyapatite bone substitute, with the other acting as a control. The orthodontic space was then closed using NiTi closed coil springs (200 g). Photographs and X-rays were acquired for documentation.
Space closure succeeded without complications, e.g., root resorptions or inflammations. Gingival invaginations occurred in two of the control sites. A difference in the velocity of extraction space closure in one patient was also observed.
Orthodontic tooth movement using this bone replacement material is possible according to these study results. This technique, thus, warrants further investigation in future clinical trials focusing on preventive means to reduce the development of gingival invaginations.
在本研究中，评估了将牙齿移入由骨替代物保存的拔牙窝的益处。进行此项研究是为了确定这对正畸间隙关闭是否有利。
对有正畸前磨牙拔除治疗指征的患者采用牙槽骨进行拔牙窝保存。采用分口设计拔除模拟前磨牙。一个拔牙窝填充二氧化硅基质包埋的纳米晶羟基磷灰石骨替代物，另一个作为对照。然后使用镍钛闭合螺旋弹簧（200克）关闭正畸间隙。采集照片和X线片用于记录。
间隙关闭成功，无并发症，如牙根吸收或炎症。对照部位中有两个出现牙龈内陷。还观察到一名患者拔牙间隙关闭速度存在差异。
根据这些研究结果，使用这种骨替代材料进行正畸牙齿移动是可行的。因此，这项技术值得在未来侧重于预防牙龈内陷发生的临床试验中进一步研究。
