Since the root surface at #29 is distinct (Fig.1), while that at #21 is not (with subgingival caries, Fig.2), closed and open socket shields are done at #29 and 21, respectively (Fig.3,4 S), followed by implant placement with guide (Fig.4-6).  Extraction of #29 is difficult and traumatic because of no PARL.  The socket shield is slightly loose.

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Xin Wei, DDS, PhD, MS 1st edition 10/03/2019, last revision 10/05/2019