Alveolar Crestal Approach for Maxillary Sinus Membrane Elevation with <4 mm of Residual Bone Height: A Case Report

Figure 3

(a) Osteotomy preparation in the sinus floor using a rotary-grind bur. (b) The two drills on the left are CAS drills (reamer) and the two drills on the right are DASK drills (sinus bur).