Abstract
Accidental perforation of the maxillary sinus during maxillary-molar tooth extraction is not rare. Perforation into the maxillary sinus is cited as one of the complications after tooth extraction that could result in maxillary dental sinusitis and/or oral maxillary sinus fistula, which may remain for an extended period. We report on the progress and treatment of post-maxillary sinus perforations caused by tooth extraction. We investigated 21 patients with maxillary sinus perforation or oral maxillary sinus fistula who visited the Ohu University Hospital （April 2015-March 2017）. A retrospective study was conducted from the medical records and X-ray data of the patients. As a result, 10 out of the 21 cases （47.6％） were male and 11 （52.4％） were female. Of the cases, 13 out of 21 （61.9％） cases of maxillary sinus perforation occurred when the first molar was extracted, while 3 （14.3％） occurred when the second or third molar was extracted. Regarding treatments, surgical closure by mucosal flap or tongue flap was performed in 11 cases （52.4％）, and a combination of closure and dentures in 8 cases （38.1％）.
