# A bony opening in the canine fossa is commonly used to: A. Enter the maxillary sinus B. Establish drainage of an alveolar abscess C. Remove mandibular third molars D. Uncover and marsupialize a cyst The correct answer is A. Enter the maxillary sinus. The wall of the sinus is very thin in this area. This area is used for following: (i) Diagnostic aspiration, and (ii) The site for Caldwell-Luc operation; that is, the antral exploration with or without an intraoral antrostomy. Reference: Textbook of Oral and Maxillofacial Surgery, Third Edition, Neelima Anil Malik, Page no. 639 CLICK HERE FOR MORE MCQS