After use of proximators at #19, cowhorn forceps are applied, resulting in metal crown dislodgement.  Since there is distal bone loss, distal socket sheath is contemplated.  The tooth is sectioned.  When an elevator is inserted between the roots, the distal root is loosened first.  The 2 roots are removed, revealing a rounded end septum (Fig.2 S) and a larger distal socket.  

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Xin Wei, DDS, PhD, MS 1st edition 05/28/2020, last revision 05/28/2020