Looks like a Dens-en-dente case….but the CBCT shows that the supernumerary tooth is not attached in any way to tooth #2.1. Tooth #1.1 was previously avulsed and replanted, but never followed up for some unknown reason.
Frederic Barnett, DMD
Interim Chair, Maxwell S. Fogel Department of Dental Medicine
Chairman and Program Director
IB Bender Division of Endodontics
Albert Einstein Medical Center