[Complication connected with sinus elevations].

Following tooth loss it may be necessary to increase the amount of bone at the maxillary alveolar ridge into which dental implants are to be inserted. Augmentation of the maxillary sinus is performed for this purpose. It may be considered as a routine intervention, but like all surgical methods, it involves certain risks. The authors intended to assess the frequency of complications among the sinus-floor elevations that they have performed.