An intraop PA is taken after extraction to confirm whether a broken surgical fissure bur tip retains or not; the distal lamina dura of #31 is low (Fig.5 *).  It is expected to increase after cocktail bone graft (Fig.5' arrow). 

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Xin Wei, DDS, PhD, MS 1st edition 09/12/2019, last revision 09/29/2019