Extensive interconnection of oral cavity with either paranasal sinus or nasal cavity arises after resections in the alveolar and palatal region during surgical treatment of tumor. Oroantral communications of minor extent most frequently arise after tooth extractions in the lateral part of maxilla. This interconnection induces difficulties in ingestion and articulation to the patients. Oroantral and oronasal communications of minor extent can be closed by either direct suture or by means of rotated mucosal flaps from the communication surrounding. The reconstruction is more difficult in larger defect, which can be closed with buccal fat pad, lingual flap and temporal muscle. Closure of very extensive defects is most difficult. These defects can be closed by free flaps with vascular pedicle, and also the bone defect can be reconstructed at the same time. The choice of the particular method depends both on defect extent and experience of the surgeon. Application of buccal fat pad represents a reliable and technically undemanding method, using of which quite extensive communication can be closed. In this paper particular techniques of oroantral and oronasal communications are described and compared.

        Key words: oroantral and oronasal communication, flap types, buccal fat pad.