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目的:观察早期移动牙进入牵引成骨新骨区后,移动牙张力侧牙周的改建情况,探讨牙周改建的机制。方法:选择9只Beagle犬,采用自身对照设计,实验组以犬的一侧下颌行牵引成骨术,待牵引完成后即刻远中移动第三前磨牙(P3),对照组拔除下颌第四前磨牙后远中移动P3,每周测量牙移动距离。分别于牙移动1、2、4周取材,通过HE染色及荧光双标记法观察张力侧牙周组织的改建。结果:实验组牙移动速度(1.055±0.054)mm/周,明显快于对照组。与对照组相比,实验组移动牙的张力侧牙周膜显著增宽,细胞成分丰富,有明显新骨生成;牙槽骨骨矿化沉积率平均为2.593μm/d,显著快于对照组(1.567μm/d)。结论:牵引成骨新骨区牙快速移动可能与移动牙张力侧成骨细胞出现早,分布广及牙槽骨矿化沉积率高有关。
OBJECTIVE: To observe the periodontal remodeling of the moving tooth during the early stage of moving the tooth into the new area of traction osteogenesis and to explore the mechanism of periodontal remodeling. Methods: Nine Beagle dogs were selected and their self-control design was used. In the experimental group, mandibular mandibular traction and osteotomy were performed in the experimental group. The third premolar (P3) was moved far after the traction was completed. The control group was removed the fourth premolar After the move in the distance P3, measuring teeth moving distance per week. One, two and four weeks after tooth movement respectively, the reconstruction of periodontal tissue on the tension side was observed by HE staining and double fluorescent labeling. Results: The tooth movement speed of experimental group (1.055 ± 0.054) mm / week was significantly faster than that of control group. Compared with the control group, the periodontal ligament in the tension side of the experimental group was significantly broadened and the cellular components were abundant with significant new bone formation. The mean alveolar bone mineralization deposition rate was 2.593 μm / d, which was significantly faster than that of the control group (1.567 μm / d). CONCLUSION: The rapid tooth movement in the new area of distraction osteogenesis may be related to the appearance of early and widespread osteoblasts on the tension side of the moving tooth and the high deposition rate of alveolar bone mineralization.