Abstract
The sagittal split ramus osteotomy (SSRO) is the most common surgical technique for the correction of cases of mandibular deformity. Advantage of SSRO is that the surgical access to the mandible is intraorally, which does not produce scars on the face and lowers risk of the injury to the facial nerve. SSRO starts with a horizontal cut on the medial aspect of the mandible just above the lingula, deepening half-way through the thickness of the ramus. “Rai triangle’, a new anatomic landmark on the medial surface of the ramus of the mandible which when identified and taken into consideration, may have a definite advantage. Our hypothesis is the mandibular ramus of patients with prognathic mandible are thinner than the retrognathic mandible. The aim of this retrospective clinical study is to evaluate and compare the RAI triangle area of the mandibular ramus with skeletal class I, II and III patients who undergo orthognathic surgery.
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