In the operation group,mandible fracture was made by transverse osteotomies and fixed by the titanium plate,and examined with ultrasound at 1 day,1,2,4,6,and 8 week post-operation.

• 手术组截断兔下颌骨后钛板内固定,制成动物模型,并分别于术后1天、1周、2周、4周、6周、8周对实验兔进行超声观察。