Analysis of chin augmentation with autologous bone grafts harvested from the mandibular angle.

Abstract

Many different options are available for the treatment of microgenia, including augmentation using silicone, alloplastic materials, and autologous bone grafts. In our experience, we have found that a prominent mandibular angle is often associated with mild to moderate microgenia. The authors report on the use of bone from mandibular angle osteotomy for chin augmentation. Exposure of the chin region was accomplished using a transmucosal approach. The mentalis muscle fibers were sharply incised by electrocautery and stripped from the mandible in a subperiosteal plane. The excised bone from the osteotomy was formed into a suitable shape and transplanted into the mental region. The procedure was performed in 46 patients with an average age of 26 years. Follow-up ranged from 5 to 48 months. Cephalometric profile film and 3-dimensional computed tomography revealed undesirable levels of bone resorption in 73.9% of cases, with complete resorption in 5 cases. Only 2 cases showed minor resorption. Use of bone from the mandibular angle for correction of microgenia shows a tendency toward resorption and a high degree of bone loss.