A
Acrylicwookie
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I am just curious how tight you guys clamp the flasks into the flask holders for curing? We use the typical flask/press as seen in the pic I posted (just a pic I grabbed from net) I was taught to tighten it as tight as I can get it. However, the more I think about it due to some issues I've been having, I think I'm clamping too tight.
I final pack to 3k and let it sit for a while under that load until I have no more flash. Then I put them into the flask press and let sit for 20-30 minutes and then into the bath overnight. When I get in in the morning, there is occasionally some very thin flash that is curly.
So, I'm thinking maybe, just maybe, I'm not getting the flash when I'm packing because the brass is cold. But when it heats up it possibly becomes softer which causes it to be more malleable than normal? Also, the flask press doesn't exert it's pressure evenly over the flask either - unlike our press pack does. The curing press is just a bar that goes over the middle. So I'm wondering if it is pushing down more as it heats up causing the flash?
The issue that caused me to think this over is I've been having some fit issues lately...but they are sporadic. The flash issue is sporadic as well. I'm wondering if flasks have a usage life and if so, maybe we have a couple that are needing to be recycled? I recently had an upper that was just ridiculously loose. The bite rim was nice and snug so I know my final model was good - I'm just wondering if the flask was pushed in further than normal causing the model to push into the acrylic causing the intaglio surface to be bigger?
Like I said, I think I'm clamping too tight...but I don't really have the urge to experiment and screw up a denture! lol. Any input would be greatly appreciated! (and the Ivo system is not an option to fix things right now lol
I final pack to 3k and let it sit for a while under that load until I have no more flash. Then I put them into the flask press and let sit for 20-30 minutes and then into the bath overnight. When I get in in the morning, there is occasionally some very thin flash that is curly.
So, I'm thinking maybe, just maybe, I'm not getting the flash when I'm packing because the brass is cold. But when it heats up it possibly becomes softer which causes it to be more malleable than normal? Also, the flask press doesn't exert it's pressure evenly over the flask either - unlike our press pack does. The curing press is just a bar that goes over the middle. So I'm wondering if it is pushing down more as it heats up causing the flash?
The issue that caused me to think this over is I've been having some fit issues lately...but they are sporadic. The flash issue is sporadic as well. I'm wondering if flasks have a usage life and if so, maybe we have a couple that are needing to be recycled? I recently had an upper that was just ridiculously loose. The bite rim was nice and snug so I know my final model was good - I'm just wondering if the flask was pushed in further than normal causing the model to push into the acrylic causing the intaglio surface to be bigger?
Like I said, I think I'm clamping too tight...but I don't really have the urge to experiment and screw up a denture! lol. Any input would be greatly appreciated! (and the Ivo system is not an option to fix things right now lol