Edentulous Custom Tray for PVS Impression Fabrication

Note: Trays should be fabricated at lease 24 hours in advance to ensure triad shrinkage is minimal during the impression.
 
Maxillary PVS Custom Tray Fabrication Sequence

Identify location in which over-extended alginate impression tissue appears to begin to fold and mark with a blue pencil.  Then mark about 1 mm superior to the blue line a red line.

Adapt one layer of base plate wax to intimately cover the tissue surface of the maxillary arch.  Cut the pink wax back to the previously scribed red line.  Cut three tissue stops into the pink base plate wax; one in the anterior and one in each posterior segment.

 

Apply separating medium over the wax and then adapt triad tray material over the entire wax relieved area.  Cut the excess triad about 2 mm from the pink base plate wax extension.  Using a wax spatula curl the excess triad material back against the pink base plate wax until the blue line is at the same level as the triad extension.  Then add a handle that won't interfere with the patients lips.  Cure for 2 minutes and remove the wax.  Then cure for 6 minutes intaglio surface up.

 Mandibular PVS Custom Tray Fabrication Sequence
Fallow the same steps as described above with the mandibular custom tray.