For socket shield at #18 (Fig.6 *), section the tooth horizontal with a new surgical fissure bur (Fig.4 black area), use an end-cutting bur to remove buccal edge of the root (Fig.5 red area) and finally remove the lingual portion of the root (Fig.6 pink).  Insert 4.5x10 mm dummy implant (bottom of the 1st line) to determine whether the final implant 5x7.3 mm will probably contact the shield.  In fact the implant does contact the apical end of the shield, but it cannot be removed because of poor access.

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Xin Wei, DDS, PhD, MS 1st edition 08/30/2019, last revision 02/02/2020