| Abstract: | objective The method of bone lengthening by dlstraction of callus was used on dog mandible as a model to study the capability and changes of membranous bone during distraction osteogenesis. Methods 15 dogs aged 5~7 months were chosen as the subjects. The operation included a unilateral or biIateral periosteal preserving corticotomy of mandibular bone, and an introral mini lengthening device were fixed to the buccal side of the mandible.After 7d, the mandible was lengthened 1mm/d for 2od and then held in internal fixation for 7~14od (1~2o weeks).Results The dogs were killed at 3 times. Anthropometric measurements, X-ray examination and histologicaI observation were conducted and conformed that the distracted bone had formed in the expanded zone successfully. Conclusion The results suggested that we could use the DO technique in the area of craniofacial clinic. The strong ability of generating new bone in membranous skeleton by DO technique should be further demonstrated in the future. |
