Photos in Fig.1-3 are taken when the margin of #29 Zirlife crown is trimmed (Fig.1 buccal, Fig.2 lingual, Fig.3 mesial view).  That of Fig.4 is taken after the margin of #30 crown is trimmed (lingual view).


  1. The margin of the lower posterior teeth does not need to be subgingival.  Supragingival margin prevents cement retention
  2. If prep margin is not clear, please send model to me for margin marking
  3. Please check my website for margin of prep if indicated; 2 cases lately
  4. Please ask a second senior technician to check margin marking on model.

Return to Technician

Xin Wei, DDS, PhD, MS 1st edition 01/18/2015, last revision 01/18/2015