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If a 16 mm implant is placed, there will be approximately 5 mm apical bone (Fig.4); 7 mm for a 18 mm implant. The bone height is 25 mm (Fig.6). Therefore, once initial osteotomy is established with a 13 mm long drill with PA confirmation, the osteotomy is extended to its depth with 1.5x21 mm drill (Fig.5).
Xin Wei, DDS, PhD, MS 1st edition 03/05/2017, last revision 03/05/2017