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The proximal contact of this case is small and uneven (Fig.3b illustration (occlusal view), as compared to an ideal condition (Fig.4a; B: buccal; L: lingual). Food impaction is more likely related to small contact area than a so-called gap. In fact the floss has a certain degree to pass the contact. Therefore when a new crown is designed and fabricated, try to make contact surface as large as possible. For example, make the mesial portion (occlusal table) of the crown larger than the distal one buccolingually (Fig.3c red lines) so that the proximal contact could be a little larger. The large mesial occlusal table is alright with the implant, which has been placed for 14 months (well heals).
Xin Wei, DDS, PhD, MS 1st edition 12/14/2016, last revision 12/15/2016