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Fig.2 is a sagittal section for the upper left posterior sextant through the fused buccal roots of the 2nd molar (2). The apex of the buccal roots appears to stick into the sinus. 1: 1st molar: purple line: coronal section for Fig.1.
Xin Wei, DDS, PhD, MS 1st edition 12/28/2014, last revision 12/28/2014