Enter the Clear Clone Denture Technique (Part 2): Making the Duplication Flask

You have decided to duplicate a patient’s existing dentures.  Now, here is how to proceed.  Remember from last time, this is certainly a skill that anyone with dental background can do.  It’s a matter of selecting the correct materials, learning a few essential skills and then practicing those skills.  I have seen entire groups of doctors and assistants at evening courses create perfect duplication flasks on their first try.

I like to have my assistant make the duplication flasks while I am doing exam and consultation with patient.  The whole process takes less than 30 minutes.  Their teeth will be out of the mouth anyway so why not?  By doing this, you will save an initial impression appointment.  Even if the patient elects not to move forward with treatment, you are only out a couple of dollars worth of putty.

Materials you should have on hand:

·          Vaseline
·          SilTech Putty (Ivoclar) Don’t use the PVS putty you use for impressions.
        Siltech is really cheap and relatively easy to use
·         Disposable Impression Trays
·         Bard Parker Lab knife with disposable blade

1. Select an impression tray that is larger than the denture being duplicated.
For simplicity, a #1 Coe Spacer tray works well for this procedure.

2. Measure out 5 scoops of Siltech Putty and make a flat patty in your palm.  Use the scoop to make scoop indentations in the putty.  These scoop marks serve to help measure out the correct amount of accelerator.  Two measures of accelerator for each scoop.

    3.  Fold the material over onto itself and begin to mix the material thoroughly.  No red streaks is a good mix.

4.      Fill the tray with Siltech mixture and then with deliberate, continuous motion press the denture into the putty.  It will require some pushing of the putty around the periphery to gain a good impression of the external surface of the appliance.

5.      Allow the putty to set. (5 minutes)  Then remove the denture and inspect the impression.

6.      Take a sharp lab knife and trim the periphery to a flat surface.  Optional, cut in a few V shaped notches for future reference.  Apply Vaseline to all periphery as a releasing agent for the next mix of putty that will be placed into the intaglio surface of the denture.  Finally, reseat the denture into modified putty impression.

7.      Now make a second mix of Siltech putty similar to the first.  Squeeze the putty into a shape that can easily be pressed into the intaglio surface of the denture.  This is best done with a smooth, even pressure making sure to press the material fully into the intaglio surface.


8.      Create adequate thickness and press the material over the flat periphery and into the index points.

9.      Allow material to set, remove this upper portion and inspect the intaglio impression you have taken.

10.  Package the putty flask (s) and send to Drake.  
On the prescription, request a C3 duplicate denture.

11.  Drake will return a C3 denture a few days later.

The last installment of this Blog will discuss the clinical technique associated with a successful use of C3 dentures.

Until next time……….


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