Sensory buccal nerve
The sensory buccal nerve crosses the upper anterior rim of the mandibular
ascending ramus in the region of the coronoid notch. It is usually below the
mucosa running above the temporalis muscle fibers. When the posterior
vestibular incision is carried sharply along the bony rim, the buccal nerve is
at risk of transsection resulting in numbness in the buccal mucosal region.
Therefore, to protect the nerve, the posterior incision is to be extended
bluntly as soon as the lower coronoid notch is reached.