Chairside - Glidewell Dental Labs

Figure 5: This view shows the space created for incisal reduction as
the patient closes to centric occlusion. 1.5 mm of space is needed in all
functional movements.
Figure 6: Retraction cords in place on the facial and lingual surfaces prior
to the registration of the master impression
Figure 7: Facial view of the gingival retraction cords in place
Figure 8: The #00 cord is left in place after removal of the #1 cord, leaving
an obvious sulcus prior to injection of the light-bodied impression material.
clearance is checked in protrusive and lateral excursions
as well, to make sure adequate space has been provided.
The preparation is polished with a round-ended 30 micron
finishing diamond, followed by rubber polishing abrasives
to smooth the cut metal substructure and porcelain.
Next, a retraction cord (UltraPak ® [Ultradent; South Jordan,
Utah]) is placed on the facial and lingual marginal
areas of the preparation (Figs. 6, 7). A two-cord technique
is used, first placing a #00 cord, then a #1 on top of it.
After a few minutes, the top cord is removed leaving
the #00 in the sulcus (Fig. 8). The master impression is
then made using a syringeable light-bodied and heavybodied
vinyl polysiloxane impression material (Honigum
[DMG America; Englewood, N.J.]) (Fig. 9).
Figure 9: The impression is made using a polyvinyl siloxane impression
material. Note the margin is captured, as well as approximately 0.5 mm
of tooth or root surface apical to the prepared margin. This will ensure an
accurate fit of the saddle crown.
Repair, Don’t Replace – Part 229