[Sinus floor bone augmentation: implementation of the concept of sinus-lift].

Sinus floor elevation is a technique allowing implant placement in the posterior edentulous maxilla when residual bone height is limited. This technique has evolved a lot since it has been first introduced in the eighties. Nowadays, this approach is considered as predictable, simple and practicable under local anaesthesia. The present article aims at understanding clearly the biological phenomenon of "sinus-lift". Moreover, the surgical protocol used at the University of Liège is considered didactically and reasoned according to the scientific literature.