Part 1: How to make a clasp/tooth index using Blu-Moose® Super
-Fast material.
1. Prepare the tooth for a crown as usual and take
the working impression using whatever technique and materials you
prefer.
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Figure
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Figure
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Figure
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Figure
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Figure
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2. Insert the RPD
in the mouth and assure that it is properly positioned (Figure
1).
3. Inject Blu-Mousse Super-Fast over the preparation. Continue
expressing the material until the clasps and occlusal rests are
completely covered (Figure 2).
Because Blu-mousse has the fluffy consistency of whipped-cream,
it will not flow. Therefore, there is no need to use a confining
tray.
4.
Remove the RPD in 30 seconds with the Blu-Mousse blob attached
(Figure 3). Notice the impression of the preparation.
5. Using a blade, carefully
trim away the Blu-Mousse until the outer surfaces of the clasps
and rests are exposed (Figure 4). Cut away any additional
material that prevents the Blu-mousse index from being removed
(Figure 5).
6.
Remove the index from the partial denture by pushing it in an apical
direction (Figures 6 & 7).
Temporize the preparation, and send the patient home
wearing the partial denture.
Part 2: How to create a clasp-template using pattern
resin.
1. Pour the working model and separate the dies as usual.
2. Seat
the Blu-Mousse index onto the preparation. Using a Neelon technique
(also called "brush-dip" or "salt and pepper" technique),
flow conventional pattern resin into the impressions of the clasps
on the surface of the Blu-Mousse index.
After the impression of
the clasps has been filled, extend the resin outward in order
to give the template enough bulk to withstand
handling.
(Note: The only part of the template that must precisely recreate
the clasp and rest is the internal surface... where the clasp
metal faces crown.)
3. Continue building the pattern resin outward until
the template sits securely on the model on either side of the index
(Figure 8).
4. After the
resin has set, carefully remove the template from the Blu-Mousse.
(To avoid damaging the resin, it may be necessary to
cut the Blu-Mousse index into pieces.)
5. Replace the template onto
the model (Figure 9).
6. Use the resin template
as a contour-guide during crown fabrication (Figures 10 & 11).
7. When the patient presents for crown cementation, the new crown
fits the RPD with few (if any) adjustments... even though the technician
never saw the actual partial denture.
Technique contributed by:
Dr. Allen L. Weiner (Medfield, MA)
Written by Nelson Gendusa, DDS
Director of Research
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