The tooth #3 seems to have periodontal-endodontic disease (Fig.1,2).  An implant is needed if the patient feels that mastication is insufficient when #4, 13 and 14 restoration is finished.   Check the tooth #6 for DL caries.   

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Xin Wei, DDS, PhD, MS 1st edition 05/02/2020, last revision 05/02/2020