There are two types of
impressions that we routinely take in this office. The first type is for the
fabrication of study models and diagnostic casts. The second is for the
construction of laboratory-processed crowns, bridges, and removable partial
dentures.
Study
Model or Preliminary Impressions
Study model impressions are
the most common impressions made in a dental office. A sterilized metal tray or
a disposable plastic tray is used for this procedure. The tray is fitted
approximately to the dimensions of your upper or lower jaws and will cover your
teeth and gum tissue. Once fitted, the tray is partially filled with a soft,
viscous impression material. This material has the consistency of thick cookie
dough batter. The filled impression tray is placed over your teeth and gently
pressed into place. The material will take from 1 to 2 minutes to set.
The impressions are absolutely painless and require no medication or
special preparation. The material has a moderately pleasant taste.
From this impression, stone
models will be made that are a very close duplicate of your teeth. These models
allow us to analyze your teeth and properly design your dental treatment. We
investigate the possibilities of orthodontics (braces), custom trays for whitening
teeth, and replacement of missing or severely damaged teeth. We make custom
trays for final impressions, guides for temporary crowns, mouthguards, splints,
etc.
Final
Impressions
This type of impression is
for fabrication of crowns, bridges, or partial dentures. The impressions are
made with a different material, one that is much more accurate in demonstrating
the smallest details of the prepared area. Because of the increased need for
precision, the impression is different. A custom-fabricated tray is often made
from the model made in the preliminary impression. This material will be in
place for 3 to 6 minutes. Often, a local anesthetic has been used to prepare
the tooth so there should be no discomfort. It is not uncommon that a second or
third impression might be taken to ensure the accurate fit of the finished
restoration. If the impression is not
right, the final restoration will be compromised.
Occlusal
Registration
With both types of
impressions, it is standard practice to take an occlusal (bite) registration
during the appointment. This gives us the ability to relate the upper and lower
jaw models. The impression may be placed on a tray or directly onto the biting
surface of your teeth; you will then be instructed to bite down and hold your bite
in place until the material sets. The bite registration impression sets very
quickly.
If you have any questions about impressions, please feel free to ask us
at (512)250-5012. –Omni Dental Group
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