When placing the implant, the most important factor is good and quality bone in which the implant will be integrated. The bone loss may be the biggest problem when placing the implants. This deficiency is most common in the back zone of the upper jaw. Sinus lift represents replacement of the bone by raising the bottom of the maxillary sinus. In some cases, the implant can be places simultaneously with the lifting of the sinus and bone replacement. In the case of large resorption or large bone loss, however, after the sinus lifting and bone replacement, we have to wait six to eight months to let the bone recover and then place the implant.