As expected, the 3 roots are fused (Fig.4).  The socket is single and triangular (Fig.6 green outline (black one: gingival margin)).  What is not really expected is the presence of the possible MB2 canal (Fig.5 *).  The mesiodistal width of the buccal roots and palatal one are 6.5 and 4.5 mm, respectively. 

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Xin Wei, DDS, PhD, MS 1st edition 10/19/2016, last revision 02/13/2019