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).  With socket shield, there is limited remaining space for bone graft (Fig.4).

Open & Closed Last Next Xin Wei, DDS, PhD, MS 1st edition 10/01/2019, last revision 10/03/2019