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The ideal contact area (buccal view) should be also wide occlusocervically (Fig4a (O, C)). Between the 2 natural teeth is the nice, pointed gingival papilla (red outline). The latter undergoes recession and flattening after extraction and implant (Fig.4b red outline). When the contact is small and light, the food is easily driven into the large gingival embrasure (*). The tooth #30 has a PFM crown; the distal surface is a slope. In order to increase the contact area, the distal surface is flattened (Fig.4c pink rectangle to Fig.4d green line) after removal of the crown of #31. The mesial surface of the new crown is to be fabricated as wide as possible occlusocervically. In addition, try to close the gingival embrasure as much as possible (Fig.4d *, as compared to Fig.4b).
Xin Wei, DDS, PhD, MS 1st edition 12/14/2016, last revision 12/14/2016