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When a 3 mm osteotome is being tapped, it deviates distal (Fig.4). The 4 mm trephine bur is re-used for 4 mm (possibly penetrating the distal sinus floor (Fig.5 >), the 3.5 mm osteotome still cannot elevate the sinus floor.
Xin Wei, DDS, PhD, MS 1st edition 08/24/2015, last revision 08/25/2015