A preop PA (Fig.1) shows that the periapical radiolucency of the neighboring tooth, #19, disappears.  *: the residual roots of the teeth #17 and 18.

Note 2 or more portals of exist associated with the distal root of the tooth #19.  It is safe to place an implant next to a previously infected site.

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Xin Wei, DDS, PhD, MS 1st edition 08/10/2014, last revision 01/19/2018