Pearls
How to fabricate a new crown that fits an existing RPD...without forcing
the patient to surrender the partial.
the patient to surrender the partial.
Figure 1
Figure 2
Figure 3
When a tooth abutting a partial denture rquires crowning, the dentist traditionally picks up the prosthesis in a full-arch
transfer impression and sends it to the laboratory. This allows the technician to use the clasps as a guide when creating
the crown contour.
For most patients, going dentureless (even for a few days) is unpleasant. Without the prosthesis, mastication may be
difficult. If the RPD includes anterior teeth, the patient may spend the period between appointments hiding from the
world in mortified seclusion.
the following technique uses a Blu-Mousse Super-Fast index to register the clasp-tooth-relationship. This allows the
technician or dentist to create an accurate template of the clasp. As a result, the patient never has to surrender the
prosthesis.
Incidentally, we didn't dream up this technique ourselves. It was contributed by Dr Allen Weiner (Medfield, MA) who also
sent the clinical photos (#8-12)
PART 1: How to make clasp/tooth index using Blu-Mousse Super-Fast material.
1. Prepare the tooth for a crown as usual and take the working impression using whatever technique and materials you
prefer.
2. Insert the RPD in the mouth and assure that it is properly positioned (Figure 1)
3. Inject Blue-Mouse Super-Fast over the preparation. Continue empressing material until the clasps and occlusal rests are
completely covered (Figure 2). Because Blu-Mousse has a fluffy consistency of whipped-cream it will now flow. Therefore,
there is no need to use a confining tray.
4. 30 seconds later remove the RPD 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. Using the resin template as a contour-guide during crown fabrication. (Figures 10 & 11)
7. When the patient presents fro crown cementation, the new crown fits the RPD with few (if any) adjustments...even
though the technician never saw the actural partial denture!
transfer impression and sends it to the laboratory. This allows the technician to use the clasps as a guide when creating
the crown contour.
For most patients, going dentureless (even for a few days) is unpleasant. Without the prosthesis, mastication may be
difficult. If the RPD includes anterior teeth, the patient may spend the period between appointments hiding from the
world in mortified seclusion.
the following technique uses a Blu-Mousse Super-Fast index to register the clasp-tooth-relationship. This allows the
technician or dentist to create an accurate template of the clasp. As a result, the patient never has to surrender the
prosthesis.
Incidentally, we didn't dream up this technique ourselves. It was contributed by Dr Allen Weiner (Medfield, MA) who also
sent the clinical photos (#8-12)
PART 1: How to make clasp/tooth index using Blu-Mousse Super-Fast material.
1. Prepare the tooth for a crown as usual and take the working impression using whatever technique and materials you
prefer.
2. Insert the RPD in the mouth and assure that it is properly positioned (Figure 1)
3. Inject Blue-Mouse Super-Fast over the preparation. Continue empressing material until the clasps and occlusal rests are
completely covered (Figure 2). Because Blu-Mousse has a fluffy consistency of whipped-cream it will now flow. Therefore,
there is no need to use a confining tray.
4. 30 seconds later remove the RPD 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. Using the resin template as a contour-guide during crown fabrication. (Figures 10 & 11)
7. When the patient presents fro crown cementation, the new crown fits the RPD with few (if any) adjustments...even
though the technician never saw the actural partial denture!
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Figure 12
| Digital Dental Technologies Dental Laboratory 918-252-9200 * toll free 866-933-0220 5884 S 129th E Ave Tulsa, OK 74134 |
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