A 4.5x10 mm implant is well placed at #19 in term of trajectory with guide (Fig.1).  Because of crestal bone resorption, the implant is placed deep with increased potential of abutment screw loosening.  The key to prevention of bone loss is socket shield.

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Xin Wei, DDS, PhD, MS 1st edition 10/08/2019, last revision 02/26/2020