Dentaltown June 2017 - 35

advantage of the water content. If you don't submerge it in water, syneresis occurs and the
material will shrink slightly towards the bulk resulting in a slightly larger cast and more passive
fitting frame made to this cast.
PVS impressions are almost too accurate for all the metal shrinkage that occurs in casting a
RPD frame. Have you ever wondered why when using a proximal plate in combination with a
cast clasp it's so tight?
You are 100 percent correct, you need to pour it up immediately, and not store it in water
because it will absorb the water and swell, resulting in a cast that is too small and a frame that
will be too tight. ■
12/14/2013

The best impressions I ever got were from a doc who used alginate. It was a two-person
technique. He would mix and load a monojet while his assistant mixed and loaded a tray. He
would capture the rests (or PDs) and the buccal and labial areas. He would then take the tray
from the assistant and slap it in.
He would always pour it up before taking the opposing. He said the time it took to pour up
gave the patient time to recover from the first impression and the impression was never forgotten
and poured up an indeterminate time later. ■

cynosurer
Member Since: 02/12/02
Post: 14 of 66

12/14/2013

USCDDS95

What's the best way to make sure alginate sticks to custom tray? ■
12/16/2013

Use alginate adhesive on a custom tray. Pouring models is an art. We use a vacuum mixer,
graduated cylinder, and scale. It must be immediate. There must be no paper towel wrapping,
etc. That said, I use PVS and they drop in. ■

Member Since: 10/05/06
Post: 18 of 66

ponderosa
Member Since: 08/30/07
Post: 19 of 66

12/16/2013

I used to have major problems, but now almost every framework fits. I use resin-modified
alginate (Alginmax). You can pour this four days later, just keep it moist in a zip-lock bag.
Assistant mixes with an Alginator. She gives me a little glob and I put it into a Monoject syringe.
I cut off half of the tip and syringe it around rest preps and guide planes. Assistant hands me
metal rim-lock tray with Alginmax in it and I'm done. Let lab pour up this model. ■

Davey38
Member Since: 11/07/07
Post: 20 of 66

12/16/2013

Alginate, and then pour it with vacuum mixed die stone. Alginate cannot be sent to the lab, it's
just not accurate enough. You're expecting a full arch of metal to fit on this, so treat it like that. ■

Uwe Mohr MDT
Member Since: 01/10/05
Post: 21 of 66

12/16/2013

Uwe, do you have any issues with using polyether (in a custom tray) and letting the lab pour it? ■
12/16/2013

Best way to do it. Just make sure the tray is not too tight, with PE you need some thickness
in the material otherwise the teeth keep breaking off when you take the tray off the model. ■

roadrunnercc
Member Since: 01/31/12
Post: 22 of 66

Uwe Mohr MDT
Member Since: 01/10/05
Post: 23 of 66

12/16/2013

AccuDent (used to be system I and system II). Maybe in a custom tray. Best I've ever tried
for frameworks. ■

emooring
Member Since: 09/24/01
Post: 24 of 66

3/13/2017

dentaltown.com \\ JUNE 2017

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Table of Contents for the Digital Edition of Dentaltown June 2017