Triple Tray vs. Quadrant Tray for Bicon Abutment level impression

When do we use tripe tray?
        Before taking impression, check the patient's bite.  If the plastic sleeve does not touch the opposing teeth, a triple tray will be used.

 When do we use quadrant tray?
      Quadrant tray provides adequate space for the impression.
      Seat the abutment with tapping.  Snap impression sleeve. If the plastic sleeve is too high and patient can't bite down, a quadrant tray will be used for impression.

For quadrant tray we need to prepare:
      -Alginate impression for opposing arch
      -PVS impression for working arch
      -And bite registration

The above is modified from Carmen's version as follows

Why we need tripe tray?
        Before we take the impression i'll have the patient bite into
the triple tray relation with upper arch teeth and lower arch teeth
and close their teeth together.
        Why we need quadrant tray?
      -  Quadrant tray impression should provide adequate space for
the impression.
      -Seat the abutment with a gentle tapping force.snap
impression.sleeve.If plastic
sleeve too high and patient can't bite down that me we can use
quadrant tray for impression.
      -After quadrant tray we need to perpare:
      -Opposing arch for alginate impression
      -working arch apply pvs impression
      -Bite registation

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Xin Wei, DDS, PhD, MS 1st edition 09/25/2013, last revision 09/25/2013