Periapical X-ray taken with the paralleling technique of the clinical situation shown in figure 4. The tip of the 10 mm parallel pin is at the level of the sinus floor cortical bone after tapping it with a special concave-tip insert for the magnetic mallet. All anatomical landmarks are precisely identified and mentally mapped on the surgical field. At this point, the surgeon finalizes the osteotomy with progressively larger magnetic mallet osteotomes in 0.5 mm increments. The osteotome tip is always directed towards the area with more bone (usually palatal towards the PNR) and then verticalized during the successive movements to expand internally the bone above the osteotomy, which extends vertically. The last osteotome corresponds to the diameter of the planned implant (but the osteotome diameter is 0,2-1 mm smaller than the implant diameter to improve stability).