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A 74-year-old man has an apical fistula (into which a Gutta Percha (*) is inserted) associated with periapical radiolucency of the tooth #12 (Fig.2). The first appointment fails to find the lingual canal, in spite of the fact that there are apparent two canals shown by a preop PA (<). This PA shows that the apical end of the gutta percha points to the periapical radiolucency of the tooth #12.
Xin Wei, DDS, PhD, MS 1st edition 11/23/2014, last revision 11/23/2014