[Comparative microbiological, macro- and microscopic and x-ray findings in iatrogenic perforation of the maxillary sinus depending on the time of its lancing].

To determine whether the inflammation afflicting the sinus mucosa shortly after oroantral communication is due to an injury or an infection, microbiological studies of two biopsy preparations each were performed simultaneously in 20 patients with the diagnosis: radix in antro. As a rule, notwithstanding the time of oroantral communication aerobe micro-organisms corresponding to the local conditions of oral and nasal flora. Primary asepsis of the sinus mucosa being assumed, an infection of the sinus maxillary has to be taken into account only one hour after the dislocation of a root of the tooth into the sinus maxillary. After six hours the infection will be followed by an inflammatory reaction.