Measurement of the socket of #15 is done to determine the size of implant to be placed immediately after extraction.  Fig.1 is a section showing the mesiodistal dimension of the 2nd molar, whereas Fig.2 and 3 are axial and coronal sections at the midroot level, respectively. 

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Xin Wei, DDS, PhD, MS 1st edition 08/01/2012, last revision 09/30/2018