Symphysis, lateral, condyle, mucosa, with or without tongue (smaller than 1/3)

The mandibular defect will involve the majority of the symphysis and will extend to the glenoid fossa of the more involved side and as far posteriorly as the mandibular angle of the less involved side. Such a defect is usually accompanied by mucosal defects extending from the floor of mouth into the retromolar trigone, with possible extension into the anterior/lateral tongue.

This defect typically results from resection of squamous cell carcinoma, sarcomas or osteoradionecrosis.