Endodontics · single question
Which tooth carries the greatest risk of extruding endodontic sealer into the maxillary sinus?
Show answer and explanation
Correct answer: B. Maxillary second molar
- A. Mandibular teeth have no anatomic relationship to the maxillary sinus.
- B. Correct. The palatal and buccal roots of maxillary molars — especially the second molar — lie closest to (and sometimes project into) the sinus floor, with the thinnest or absent intervening cortical bone.
- C. The maxillary canine relates to the nasal cavity/canine fossa, not the sinus floor.
- D. Mandibular premolars relate to the mental foramen, not the sinus.