Mandibular ramus reconstruction using embedded self-loading distractor in a rabbit / 实用口腔医学杂志

ABSTRACT

Objective:To develop an automatic and continuous distraction osteogenesis technique by using totally embedded distractor of nickel titanium (Ni-Ti) shape-memory alloy for the reconstruction of mandibular ramus. Methods:16 adult New Zealand rabbits were used in the experiment. Mandibular ramus and condyle on one side was removed to create a 1.5 cm segmental defect. A transport disc was created by "L" shape osteotomy at the end of the remnant ramus and Ni-Ti distractor was fixed and totally embedded in tissues. The rabbits were sacrificed 2 months after operation and the mandibles were harvested.The bone reconstruction were studied with radiographic and histological examination. Results: 2 months after operation all the animals were alive and mandible function kept well.The Ni-Ti distractors were self-activated and performed distraction osteogenesis automatically. The mandibular ramus achieved preliminary reconstruction. Histological examination showed bone regeneration in the distraction area. Conclusions: Ni-Ti distractor can fulfill automatic and continuous distraction osteogenesis.