Maxillary Sinus and its Implications
Approximately 30% of cases of unilateral maxillary sinusitis may have an underlying dental pathology. Failure to identify a dental cause usually lead to chronic sinusitis often associated with serious complications.
In addition to that, knowledge of the anatomical relationship between the maxillary sinus floor and the maxillary posterior teeth root apices is important for the preoperative treatment planning of maxillary posterior teeth and also for a predictable surgical outcome.
In this relation my blog post on relationship of Molar roots with Maxillary sinus is a highly recommended read before you watch these videos.