Although RCT at #28 is incomplete (Fig.2), there is no symptom or sign of active infection; no treatment will be rendered.  B: buccal.

It appears that the implant at #29 is buccally placed (Fig.3 (coronal section)).  Immediately post implant removal at #29, a 3x10(4) mm 1-piece implant will be placed as lingual as possible (green).  In fact the apical portion of the implant will be lingual to the Mental Loop (orange).  Pink: 4 mm cuff; blue: 5 mm abutment.  Use a dummy implant prior to a definitive one.  Angled ones should be prepared.

Immediate Replacement

Xin Wei, DDS, PhD, MS 1st edition 04/17/2017, last revision 04/17/2017