[High oblique sagittal split osteotomy]

Bilateral sagittal split osteotomy has become the standard mandibular surgery for the treatment of dental and facial deformities, even for small ones. The morbidity must be as low as possible.

We describe a technique with reduced split surfaces, with an oblique bone section rather than a split. The bone is cut complete, on the posterior edge of the ramus, following an oblique line from above the lingula downward and laterally towards the supra-angular region.

This section preserves the inferior alveolar nerve. It greatly decreases the risk of neurological sequels. Most mandibular movements are possible except for important advancement and elongation of the ramus.