There is crestal bone loss in 3 months (Fig.2, as compared to Fig.1).  Since there is more space apical to the pair abutment at #19 than that at #18, incomplete abutment seating is suspected at #19.  More X-ray will be taken (Fig.3,4).  In fact, it is not necessary.   The space differential is also noted with healing abutments in Fig.1.  The implant at #18 tilts lingually, which accounts for indistinct threads at #18 and 19.

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Xin Wei, DDS, PhD, MS 1st edition 05/07/2020, last revision 05/07/2020