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

[BACKGROUND] 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.

[OBJECTIVE] The authors report on the use of bone from mandibular angle osteotomy for chin augmentation.

[METHODS] 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.

[RESULTS] 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.

[CONCLUSIONS] Use of bone from the mandibular angle for correction of microgenia shows a tendency toward resorption and a high degree of bone loss.