Partial Denture Repair

Photo links at the bottom.

Joel

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Craig writes,

I realize this is elementary for 99.9% of the dentists but someone
might benefit from this thread.

I've done these types of repairs hundreds of times but today I thought
I might photograph the case step-by-step and post it in case anyone
does not feel comfortable doing it and wants to see how easy it is or
if they want to train an auxilliary. They love to do this stuff!

This patient had to have a lower incisor extracted and a denture tooth
added to her existing partial denture a few years ago. The tooth
recently broke off of the partial.

The following legend corresponds to the photos below:

A.-- The broken partial denture.

B. --IF the two pieces can be approximated back together EXACTLY then
you can use a tiny bit of superglue to temporarily lute them together
for the next step. If the pieces are broken or can't be glued then a
pick-up alginate impression is required to do the repair.

C. and D. --A Sil-Tech putty matrix is made around the glued
prosthesis. You can even use stone to do this but I like the Sil-Tech
because I don't need to apply a separator to the prosthesis and the
prosthesis can be removed from the matrix much much easier and cleaner
with Sil-Tech than with stone.

E.--The matrix is removed intact, the pieces are re-separated and
acrylic is judiciously removed from the partial and the tooth to
create sufficient room for a few mm of repair acrylic to be added
between. Make sure to get rid of all the superglue since it ruins
plastic. In this case all of the old acrylic was removed from the
partial framework.

F.--The intaglio surface of the matrix.

G.--The tooth is placed back into the matrix after potholes are placed
into the receiving acrylic surface for added retention.

H.--The partial is placed back onto the matrix and we're ready for the
repair acrylic to be added. I usually drop a little bit of monomer
onto the surfaces where acrylic will be added so it flows into the
nooks and crannies well. I'll even vibrate the whole thing just to be
sure.

I. and J.--You can use any type of cold-curing acrylic - I like
Coldpac because it sets fairly fast, is color stable and I'm used to
it.

K. and L.--The whole thing is placed into a pressure pot for 10
minutes at 10-15 psi in order to increase the density. Add water until
it covers the prosthesis by 2" prior to pressurizing.

M.--Remove the matrix and finish/polish. There should be minimal flash
and it should drop right into the mouth with little-to-no adjustment.
In this case occlusion on the repair acrylic was not a factor but when
it is you can make another Sil-Tech matrix which fits on the occlusal
portion of the glued pieces. After you add the repair acrylic you
place this matrix on top and use rubber bands to hold it in place
before placing into the pressure pot. This extra step saves a lot of
time messing around adjusting the occlusion in the mouth.
Attached Images
             
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Last edited by gocanes : 11-10-2004 at 03:21 PM.

http://www.dentalcom.net/forum/showthread.php?p=4758