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Ok. I am having an issue with acrylic "flash" around teeth after process.
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<blockquote data-quote="JMN" data-source="post: 247512" data-attributes="member: 8469"><p>Ohkay. Waiting for stone to dry... Hehehe</p><p></p><p>I went digging and found what passes for an IFU for this stuff. <a href="http://www.amcsupplies.com.au/manuals/plaster-mixing-procedures-application-en-IG503.pdf" target="_blank">http://www.amcsupplies.com.au/manuals/plaster-mixing-procedures-application-en-IG503.pdf</a></p><p>It is not given a dental stone Type # that I could find. Anywhere. Could have missed it.</p><p>The manufacturer has basically no data to give unless you are using it in a pond or doing agriculture with it.</p><p><a href="https://www.usg.com/content/usgcom/en_mexico/products-solutions/products/industrial-specialty/dental/hydrocal-x-21-dental-gypsum-cement1.html" target="_blank">https://www.usg.com/content/usgcom/en_mexico/products-solutions/products/industrial-specialty/dental/hydrocal-x-21-dental-gypsum-cement1.html</a></p><p></p><p></p><p>So, instead of being specific, here's the basics.</p><p>If you have a skin of acrylic on the teeth, either:</p><p>a) the teeth are shifting</p><p>b) the stone is expanding too much</p><p>c) the teeth are shrinking</p><p></p><p>Hopefully C can be dispensed with immediately.</p><p></p><p>a:</p><p>Are you being certain the teeth are fully seated into the form before you start processing?</p><p>Are you ensuring that the incisal/occlusal of the teeth remains pointed down at all times after boil out and until packed?</p><p></p><p>b:</p><p>1) Are you mixing exactly as specified? Are there any specifications or instructions at all that come with it that USG doesn't put on their website? Call them and see if you can get an answer as to what the ratio is supposed to be for your application. See if they can give any clues.</p><p></p><p>2)have you tried other stones? I mean, this stuff's SDS is the only thing I can find that says it's dental stone. It's being made by the guys who make wall plaster, wallboard, and firebricks. Nothing wrong with using it for mounting plaster, but it may be causing you more headaches than getting a stone designed for this stuff instead of relabeled for it.</p><p></p><p>3) The stone may not be intended for going swimming, my chemistry is weak, but it could be a possibility</p><p></p><p>4) How long are you letting the stone set before boilout/processing? Is it getting enough time to fully harden?</p><p></p><p>5)Are the flasks being allowed to set underwater too long causing demineralization of the stone, letting the surface you initially had effectively wash away? Over 20-30 min for no reason is bad for most labstone or buffstone that I've read or played with.</p><p></p><p>Go fish</p></blockquote><p></p>
[QUOTE="JMN, post: 247512, member: 8469"] Ohkay. Waiting for stone to dry... Hehehe I went digging and found what passes for an IFU for this stuff. [URL]http://www.amcsupplies.com.au/manuals/plaster-mixing-procedures-application-en-IG503.pdf[/URL] It is not given a dental stone Type # that I could find. Anywhere. Could have missed it. The manufacturer has basically no data to give unless you are using it in a pond or doing agriculture with it. [URL]https://www.usg.com/content/usgcom/en_mexico/products-solutions/products/industrial-specialty/dental/hydrocal-x-21-dental-gypsum-cement1.html[/URL] So, instead of being specific, here's the basics. If you have a skin of acrylic on the teeth, either: a) the teeth are shifting b) the stone is expanding too much c) the teeth are shrinking Hopefully C can be dispensed with immediately. a: Are you being certain the teeth are fully seated into the form before you start processing? Are you ensuring that the incisal/occlusal of the teeth remains pointed down at all times after boil out and until packed? b: 1) Are you mixing exactly as specified? Are there any specifications or instructions at all that come with it that USG doesn't put on their website? Call them and see if you can get an answer as to what the ratio is supposed to be for your application. See if they can give any clues. 2)have you tried other stones? I mean, this stuff's SDS is the only thing I can find that says it's dental stone. It's being made by the guys who make wall plaster, wallboard, and firebricks. Nothing wrong with using it for mounting plaster, but it may be causing you more headaches than getting a stone designed for this stuff instead of relabeled for it. 3) The stone may not be intended for going swimming, my chemistry is weak, but it could be a possibility 4) How long are you letting the stone set before boilout/processing? Is it getting enough time to fully harden? 5)Are the flasks being allowed to set underwater too long causing demineralization of the stone, letting the surface you initially had effectively wash away? Over 20-30 min for no reason is bad for most labstone or buffstone that I've read or played with. Go fish [/QUOTE]
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Ok. I am having an issue with acrylic "flash" around teeth after process.
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