Simultaneous maxillomandibular distraction in unilateral mandibular hypoplasia.

In craniomaxillofacial surgery we often deal with hypoplastic mandibles and mandibular asymmetries, the correction of which is critical to obtaining acceptable aesthetic results. In all of them we find common skeletal problems once growth has finished, such as an inclined occlusal plane and facial asymmetry with a stable dental occlusion. Simultaneous maxillomandibular distraction, which involves a Le Fort I osteotomy and a mandibular osteotomy with intermaxillary fixation during the period of active distraction, is an excellent technique to solve these problems. Virtual surgical planning, stereolithographic models, and surgical guides are supportive tools for obtaining excellent results. In this paper we present our experience with five cases of hypoplastic mandibles and mandibular asymmetries of different aetiologies. In all patients we achieved a considerable improvement in their physical appearance in the distance between the lateral canthus and oral commissure, the height of the mandibular ramus, the inclination of the occlusal plane, and the medial position of the chin. The benefits of virtual surgical planning in terms of choosing the optimal vector and the amount of distraction make it a promising technological tool to achieve excellent outcomes.