[The Bichat ball. The surgical value of oro-sinus communications].

Bichat's ball is a mass of adipose tissue used to fill communications between the buccal cavity and the sinus. The anatomy of the structure is presented. it has a body and 6 extensions. A surgical technique is proposed in comparison with previously described methods. At 6 weeks, there has been no recurrence of buccal-sinus communication in a series of approximately 300 cases operated over a period of 15 years.