2 3-OSTEOTOMY FOR LENGTHENING THE MANDIBLE IN DOGS BY GRADUAL DISTRACTION/

Successful lengthening of the mandible by gradual distraction has been reported previously, There are various methods for osteotomy before d istraction osteogenesis, In this paper, a new type of osteotomy, perfo rmed on growing dogs as a model, is reported, Ten mongrel dogs, aged 6 months, were studied, A unilateral 2/3 osteotomy was performed, and a n external lengthening device was fixed to the mandible perpendicular to the osteotomy. Seven days after the operation, the mandible was len gthened by 1 mm per day, The dogs were sacrificed for histological stu dy at the end of the distraction on days 14, 28, 56 and 120 following completion of the distraction.