Fig.1: A temporary crown is fabricated for an upper left 1st premolar implant.  There is a problem.  The implant is placed a little too lingual (L).  An extra ridge (R) is made buccal (B) to the buccal margin (M). Although the ridge improves cosmetics, it is not hygienic.  Cement and food debris accumulates between the margin and ridge and it is difficult to clean.

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Xin Wei, DDS, PhD, MS 1st edition 11/01/2013, last revision 11/01/2013