Fig.2: CBCT images of the tooth #14: A: axial; C: coronal; S: sagittal sections. The sinus floor (^) extends coronal to the tips of all three roots (mesiobuccal (MB), distobuccal (DB) and palatal (P). 

M: mesial; D: distal.

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