“…The literature reports conflicting data concerning the nature of odontogenic pathology causing the sinusitis. While most studies mention periapical and periodontal disease as the leading cause (Bomeli, et al 2009, Hoskison, et al 2012, Melen et al 1986, Nair and Nair 2010, Pokorny, et al 2013, newer literature regards iatrogenic reasons, such as post-surgical oroantral fistulae, as the pivotal triggering factors (Lechien, et al 2014, Lopatin et al 2002, Matsumoto, et al 2015, Simuntis, et al 2014. This research confirms those findings, as 64% of odontogenic unilateral maxillary sinusitis cases evolved after dentoalveolar surgical procedures.…”