[Sinusitis of dental origin].

In recent years, an increasing number of dental infections of the maxillary sinus has been observed. A prerequisite for a bacterial infection of the maxillary sinus is the perforation of Schneider's membrane. Pathogenetically, the ostiomeatal unit is only secondarily involved due to the infection ascending from the maxillary sinus floor. Besides the anamnesis, imaging procedures are important, whereby the high-resolution CT and CBCT (cone beam CT) have a special task due to their three-dimensional resolution. A dental X-ray or a dental examination for diagnosis is not sufficient in many cases. Due to the anatomy, the molars in particular are to be regarded as the cause of dentogenic sinusitis. The germ spectrum is polymicrobial with a dominance of anaerobes. Therapeutically, we favour one-stage surgery with rehabilitation of the underlying process and functional sinus surgery. Functional sinus surgery can also make a significant contribution to the rehabilitation of inflammatory complications in implantology.