Experimental oroparanasal communication in monkeys

Experimental oroparanasal communications were established in nine monkeys (Macaca irus) through the alveoli of the maxillary first or second molars after extraction of these teeth. The communications between the maxillary sinus and the oral cavity were supported by use of a polyethylene catheter fixed with sutures. The observation time ranged from 1 to 6 days. Histologic study of the maxillary sinus mucous membrane revealed inflammatory changes especially in the floor and the lower part of the walls of the maxillary cavity. These findings were most pronounced at 6 days post injury. Epithelial proliferation along the catheter was found on the 3rd day, 1-2 mm from the antral mucous membrane. A continuous epithelial covering of the oroantral communication was not verified in any of the specimens 6 days postoperatively. The proliferation along the catheter of the communication tract seemed more pronounced in the antral part at all observation periods.