Fig.7 (intraop PA): A 7x17 mm tap (T) has increased engagement into the new bone (therefore obtains stability at the depth of 17 mm from the gingival margin).  There is at least 4.18 mm for abutment and crown. 

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Xin Wei, DDS, PhD, MS 1st edition 03/08/2013, last revision 03/08/2014