Comparison of two preoperative protocols for mandibular symphyseal distraction osteogenesis to reduce the risk of tooth damage

Transverse mandibular deficiency is a common problem in orthodontic patients. The clinical signs of mandibular transverse deficiency are a decrease in mandibular arch length, a narrow intercanine width, a crowding of the lower anterior teeth, a flattened anterior arch morphology, an increased overbite and a posterior buccal crossbite (Del Santo et al., 2000; Chung and Tae, 2007). In younger patients, transverse mandibular deficiency can be corrected by orthodontic expansion, lip bumpers, Schwarz devices, or functional appliances resulting in stable results (Bell et al., 1997).

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