In order to place an implant using the internal sinus lift procedure, the patient must have an initial bone height availability of at least 4.0mm. This height is necessary to provide initial stability for the implant. For a floor transport technique, the minimum bone availability is 2.0mm.
For a sinus lift, the clinician prepares the osteotomy 1.0mm below the sinus floor until the desire width for the case. Once the osteotomy preparation is finished, an osteotome is used to fracture the sinus floor. Bone graft material is inserted into the site, followed by the implant insertion.
For the floor transport technique, the primary indication is the lack of bone to initially support the implant. A scoring of the bone in a rectangle or square shape (depending upon the quantity of the implants to be placed) is made using chisels, then, with an osteotome, the bone block is fractured and pushed towards the sinus. Hand reamers are used in order to provide the implant shape and diameter in the crestal bone. Bone graft is used to fill the sinus area that will receive the implant and then the implant is inserted. For this technique, it is mandatory to use a sinus lift abutment.