<prompt> Oroantral fistula is caused by all the following except:Dental extractionCarcinoma of maxillaCaldwell luc operationMaxillectomy  <response>: Oroantral fistula - there is a fistula between oral cavity and maxillary antrum. Causes 1. Dental procedure extraction2. Malignancy because it can lead to perforation3. Caldwell lucs operation In case of maxillectomy we remove maxilla antrum ,so the fistula will not be there. 