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Denturist
Lot of Bubbles in Dentures
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<blockquote data-quote="kcdt" data-source="post: 178292" data-attributes="member: 349"><p>It happens in a pressure vessel with autocure, because you're forcing air in to create higher atmospheric pressure. If air is not purged from the model, it migrates to the surface as the pressure forces water into the gypsum.</p><p>This doesn't happen in a flask because the water is a heat exchange medium only. There's no air pressure forcing the water to displace atmosphere.</p><p>The pressure is direct mechanical force either to the flask itself or to an injection piston. Air pressure itself isn't the means providing compression DIRECTLY.</p><p>Does that make sense?</p></blockquote><p></p>
[QUOTE="kcdt, post: 178292, member: 349"] It happens in a pressure vessel with autocure, because you're forcing air in to create higher atmospheric pressure. If air is not purged from the model, it migrates to the surface as the pressure forces water into the gypsum. This doesn't happen in a flask because the water is a heat exchange medium only. There's no air pressure forcing the water to displace atmosphere. The pressure is direct mechanical force either to the flask itself or to an injection piston. Air pressure itself isn't the means providing compression DIRECTLY. Does that make sense? [/QUOTE]
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Lot of Bubbles in Dentures
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