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The mesial gingival embrasure of the permanent crown is large (Fig.9 * with enhanced chance of food impaction), as related to the mesial undercut associated with a 5.7x4 mm A 15 degree angled abutment (Fig.10). Reduction in the undercut should be able to help lab decrease the gingival embrasure (Fig.11 red line). In fact the patient does not mind mild food impaction, which resolves using water pik.
Xin Wei, DDS, PhD, MS 1st edition 09/25/2018, last revision 03/05/2019