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After removing the crown, the margin is lowered clinically. In the lab, the mesial gingiva in the model is to be trimmed ~1 mm (Fig.17 arrow (black area)) so that the mesial embrasure is closed as much as possible (Fig.18). The contact area is larger both buccolingually and apicocoronally. Clinically, the mesial margin of the temporary crown should be a little bit bulging to push the mesial papilla mesially so that there is enough space to clean cement for the permanent crown.
Xin Wei, DDS, PhD, MS 1st edition 08/08/2015, last revision 08/08/2015