Two of 3x17 mm one piece implants are placed with the most coronal thread outside the crest (Fig.4') with less pressure on the crestal bone than when the top thread is placed under the crest. 

There is no crestal bone resorption 6 months post immediate loading with provisional (Fig.7).

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Xin Wei, DDS, PhD, MS 1st edition 10/03/2014, last revision 01/19/2018