Fig.1 is a CBCT coronal section of the tooth #14.  It shows that the sinus floor (arrowheads) extends coronally between roots (P: palatal; B: buccal).  *: apical radiolucency associated with the mesiobuccal root.

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Xin Wei, DDS, PhD, MS 1st edition 05/18/2013, last revision 05/18/2014