Which is the Infected Tooth?

A 47-year-old woman with autoimmune hepatitis has a fistula distal to the tooth #28 (Fig.1).  Periapical radiolucency appears to involve the teeth #27 and 28.  Which is the infected tooth?  Treatment plan?

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Xin Wei, DDS, PhD, MS 1st edition 02/14/2018, last revision 05/26/2018