In spite of poor trajectory associated with #18 (Fig.8) and 31 (Fig.7) Bicon implants, the abutments have not been dislodged.  For the bruxer, the next implant at #19 with distal root fracture (Fig.8 ^) should be Bicon.

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Xin Wei, DDS, PhD, MS 1st edition 08/03/2019, last revision 02/22/2020