Development of tooth root distraction toward periodontal tissue regeneration with cementum and periodontal ligament.

在日本白色家兔下颌骨上进行带磨牙根的牙槽骨截骨术。将牵张器置于下颌骨上，进行牙槽骨和牙根牵张成骨。牵引过程中，超声组下颌骨接受低强度脉冲超声（LIPUS）治疗，观察延长区牙骨质和牙周膜的再生情况。与我们的预期相反，在X线上观察到牙本质和牙髓的部分再生，因此现在尝试进行组织学观察。

Osteotomy of alveolar bone with molar roots were carried out in the mandible of Japanese white rabbit. Distraction osteogenesis of alveolus and tooth roots was performed after distractor was put on the mandible. During distraction, mandible of the ultrasound group was treated with low-intensity pulsed ultrasound(LIPUS), and regeneration of cementum and periodontal ligament was observed in the lengthening site. Partial regeneration of dentin and pulp was radiographically observed contrary to our expectations, so that histological observation is attempted now.