The retainer at #4 looks short with large gingival embrasure (Fig.8 *) 6.5 months postop. Finally the patient is ok with it because she does not like gingivectomy. The abutments at #2 and 4 are 5.7x4(4) and 4.5x4(3) mm.
Xin Wei, DDS, PhD, MS 1st edition 01/08/2020, last revision 01/10/2020