Efficacy of distraction osteogenesis of mandible in adult patients with hemifacial deformity

Abstract

Objective To evaluate recurrence after mandibular distraction osteogenesis in adult patients with hemifacial microsomia using the digital three dimensional measurement. Methods Nine adult hemifacial microsomia patients were evaluated using the method of digital measurements with three dimensional computed tomography. Three observation points were studied: pre-operation (T0), post-operation (T1) and follow-up (T2). The length of ramus (H for normal side and h for affected side), the length of body (L for normal side and l for affected side) and distance between pogonion and facial midline (D) were measured and the recurrence rate (R) was calculated. Results Percentages of h/H at T0, T1, T2 were (58.19±12.06)%, (87.09±17.92)%and (81.13±30.57)%, which had statistical significance respectively. 2. Percentage of l/L at T0, T1, T2 were (87.70±7.86)%, (90.69±5.77)% and (90.11±5.62)%, respectively, which had statistical significance between T0 and T1. 3. Lengths of D at T0, T1, T2 were (13.66±3.28) mm, (4.926±1.75) mm and (6.616±1.82) mm, respectively, which had statistical significance between T0, T1 and T0, T1. 4. Average R was (22.80±9.73)%. Conclusions Varying degrees of recurrence do happen in both ramus and body of mandibular after distraction osteogenesis. While it is demonstrated that the mandible grows obviously after operation compared to that pre-operation, Meanwhile, the facial symmetry is also improved significiantly. Key words: Adult; Hemifacial microsomia; Distraction osteogenesis; Three-dimensional measurement; Recrudescence