The teeth #15 and 18 cannot occlude when 4.5x5 mm abutment (Fig.4: A) is placed at #19 implant (<).  It takes a while to trim the unipost from the top gradually in order to let #15 and 18 have normal occlusal contact (Fig.5 mirror image).  By that time, the abutment is approximately 2.5 mm tall. 

It has never occurred to me that the abutment can be truncated with a fissure bur.  How can we avoid cutting the abutment (Fig.4 red line) too short?  Retention of crown may be affected if the abutment is too short.

Arrowhead in Fig.5: mini-implant.  In fact two mini-implants are placed (meisobuccal and distolingual) to intrude the supraerupted upper first molar.

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Xin Wei, DDS, PhD, MS 1st edition 05/25/2013, last revision 05/26/2013