A sinus lift is the addition of bone to enable the placement of an implant. There are two types of sinus lifts - a lateral window approach and a sinus tent. Both aim to accomplish the same thing, add more bone for a dental implant. Here is a patient that presented for an implant and had inadequate bone and received a lateral window sinus lift. This photo shows the height of bone before the procedure. X-Rays were taken in February 2014.