Expanders are also an alternative to the maxillary sinus elevation technique.
Expanders are driven into the bone with a ratchet wrench or low speed hand piece.
This decreases the surgical trauma of osteotomes.
Bone expanders (2.3, 2.7, 3.1, 3.5, 4.3 and 5.1mm) improve the clinical success by improving stability, maintaining bone density and increasing fixation.
Each screw had 4 score marking at 10mm, 8mm, 6mm and 4mm.