A sublabial incision is made down to the periosteum above the buccogingival sulcus to the maxillary first molars on either side; care is taken to avoid the apical dental roots.
T3: The lesion has become massive with extension to the hard palate, buccogingival sulcus, and large portion of the upper lip, upper nasal septum, and turbinate and/or adjacent paranasal sinuses, fixed with deep muscle or bone involvement.