Abstract
KEY POINTS Odontogenic sinusitis (ODS) can be associated with or caused by a variety of complications from dental or oral surgical procedures such as oroantral communication (OAC) after extraction, oroantral fistula (OAF), maxillary sinus bone grafting (augmentation, sinus lift), and dental implants. Close proximity to or extension of dental roots into the maxillary sinus (especially when complicated by periapical disease and bone erosion), and some maxillary sinus pathologies causing thinning or erosion of the sinus floor, increase the risk of developing OACs during and or OAFs after oral surgical procedures. Determining whether the dental procedure caused the ODS, and whether there is ongoing infectious dental pathology driving the ODS can be challenging, but is critical toward successful comprehensive management. This can be best achieved through a multidisciplinary approach to both diagnosis and treatment between otolaryngologists and dental specialists who perform the given dental procedures.