INTRODUCTION: Odontogenic sinusitis is an inflammatory process that occurs after the Schneiderian membrane is perforated as a result of a natural or iatrogenic cause of dental origin. Odontogenic sinusitis goes by various names in the literature, but the preferred ones are "odontogenic sinusitis" or "maxillary sinusitis of dental origin". This disease has been known to medicine for more than a century. However, recent data indicate that its prevalence is increasing year by year.Nowadays, otolaryngologists identify odontogenic sinusitis as a prevalent, but frequently misdiagnosed illness, and the association between tooth infections and maxillary sinusitis is well documented.Therefore, dentists need to be familiar with the etiologies most commonly associated with odontogenic sinusitis in order to provide the correct diagnosis and treatment for their patients. AIM: The purpose of this article is to summarize the most common etiologic factors associated with the development of odontogenic sinusitis. DISCUSSION: Odontogenic sinusitis is an inflammatory process that occurs after the Schneiderian membrane is perforated as a result of a natural or iatrogenic cause of dental origin (1, 2, 3). Odontogenic sinusitis goes by various names in the literature, but the preferred ones are "odontogenic sinusitis" or "maxillary sinusitis of dental origin", as endodontic and periodontal diseases are considered the most common etiological factors associated with the development of odontogenic sinusitis. These are followed by iatrogenic causes related to dentists' surgical interventions (3, 4).This disease has been known in medicine for more than 100 years and accounts for 10-12% of maxillary sinusitis cases (1, 5, 6, 7). Recent data, however, show that its prevalence rate is increasing every year (8, 9).Nowadays, dentists and otolaryngologists work together with a common goal - the correct diagnosis and treatment of this disease. Specialists need to be well versed in both the differential diagnosis of odontogenic sinusitis and the most common odontogenic etiologic factors associated with it (10, 11, 12). CONCLUSIONOdontogenic sinusitis is a widespread disease. Literature sources often refer to it as an "underestimated disease". Today, it is clear that the main etiologic factors associated with the development of odontogenic sinusitis are endodontic infections and periodontal disease affecting distally positioned maxillary teeth, and iatrogenic causes in the area. Therefore, it is of utmost importance that specialists are familiar with the possible " triggers " of the disease in order to be able to make a prompt and accurate diagnosis, and plan the correct treatment accordingly
