Root canal therapy (RCT) in a 85-year-old man could be intimating.  Study of CBCT (Fig.1 (sagittal section), 2 (coronal)) alleviates such anxiety.  The canal of the tooth #22 is straight, patented and close to the wear facet.  L: lingual.

Eradication of the periapical infection at the tooth #22 with RCT helps preventing post-immediate implant infection at the site of #21.

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Xin Wei, DDS, PhD, MS 1st edition 09/24/2014, last revision 06/26/2019