Define the Anatomical Considerations

1. Neurovascular bundle associated with greater palatine foramen, e.g. palatal root of the upper 1 st molar: Don't do incision at this area!

2. Mandibular canal,

 3. Mental foramen "with the plexus",

 4. Maxillary sinus,

5. Nasal floor,

6. If you did a perforation?

- Put a resorbable membrane "regeneration"

- Tell the patient not to sleep with the head downward.

- Antibiotics.

** What if the lesion is reaching the nasal floor?

- Do dissification ???? and avoid perforation.

7. Number of root canals.