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Thermoplastic Acrylics
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<blockquote data-quote="TECHARTISAN" data-source="post: 91012" data-attributes="member: 1289"><p>Hey Dave</p><p></p><p>So its been about a year....good time to touch base and revisit this subject.....</p><p></p><p>Id wondered if you ever took the plunge into the dark world of alternative dentures.......to answer your questions</p><p></p><p>1. NO you cant. heating the mixed acrylic and monomer in the tube will do one of two things, likely both, solidify the mass making it beyond the machines ability, and trap and contain unresolved monomer.</p><p>2. Maybe you could, but you shouldnt. Loading powder into the cylinder will likely result in scortching and porosity. The particle size is too small for efficient thermal dispersion the air between particles acts, to a degree, as insulation. That air will also incorporate into any melted material you sucessfully extrude. I know bead loaded cartridges have air entrapped as well but the reduced particle surface area of the larger beads vs powder particles makes all the difference in the world.</p><p>3...okay not answering a question here but "I am looking into tcs' new full denture acrylic, a hard nylon.", makes no sense. Its either nylon or acrylic, "I am looking into tcs' new full denture <span style="color: #FF0000">BASE</span>, a hard nylon." <is what I assume you mean? I am unfamiliar with the product so cannot weigh in but your statement is circular.</p><p></p><p>Your options include Bre-Crystal, Perflex Acry free, and flexite mp as far as I know. If I was pursuing this and none of these companies products was exactly what I was looking for.....Id contact them, explain what isnt right and ask them for a minimum order requirement for a custom blend. Because otherwise....</p><p>If you were to buy Diamond D in bulk, cast it into pellets, vacuum age the pellets...then get ADA approval to use them, which will probably require licensure fees and possibly FDA facilities licensing as you will be manufacturing a medical material. All of this shouldnt run you more then 1/4mill. lol</p><p></p><p>As thermoplastic PMMA injection does not require it, I am curious, are you just using the Mestra for controlling prolonged cooldown to reduce material crystalization? If so how has that worked out for you? </p><p></p><p>Sorry if this sounds prickish to any readers but unless you understand the difference between a themally cured acrylic and a thermoplastic acrylic please read <a href="http://dentallabnetwork.com/forums/f2/perfect-flask-9231/index2.html#post51376" target="_blank">this post of mine,</a> and <a href="http://www.docstoc.com/docs/74778299/Dentaltown_Article_Feb2003" target="_blank">this article,</a> specifically, the thermoplastic acrylic section, before commenting. They are different beasts.</p></blockquote><p></p>
[QUOTE="TECHARTISAN, post: 91012, member: 1289"] Hey Dave So its been about a year....good time to touch base and revisit this subject..... Id wondered if you ever took the plunge into the dark world of alternative dentures.......to answer your questions 1. NO you cant. heating the mixed acrylic and monomer in the tube will do one of two things, likely both, solidify the mass making it beyond the machines ability, and trap and contain unresolved monomer. 2. Maybe you could, but you shouldnt. Loading powder into the cylinder will likely result in scortching and porosity. The particle size is too small for efficient thermal dispersion the air between particles acts, to a degree, as insulation. That air will also incorporate into any melted material you sucessfully extrude. I know bead loaded cartridges have air entrapped as well but the reduced particle surface area of the larger beads vs powder particles makes all the difference in the world. 3...okay not answering a question here but "I am looking into tcs' new full denture acrylic, a hard nylon.", makes no sense. Its either nylon or acrylic, "I am looking into tcs' new full denture [COLOR="#FF0000"]BASE[/COLOR], a hard nylon." <is what I assume you mean? I am unfamiliar with the product so cannot weigh in but your statement is circular. Your options include Bre-Crystal, Perflex Acry free, and flexite mp as far as I know. If I was pursuing this and none of these companies products was exactly what I was looking for.....Id contact them, explain what isnt right and ask them for a minimum order requirement for a custom blend. Because otherwise.... If you were to buy Diamond D in bulk, cast it into pellets, vacuum age the pellets...then get ADA approval to use them, which will probably require licensure fees and possibly FDA facilities licensing as you will be manufacturing a medical material. All of this shouldnt run you more then 1/4mill. lol As thermoplastic PMMA injection does not require it, I am curious, are you just using the Mestra for controlling prolonged cooldown to reduce material crystalization? If so how has that worked out for you? Sorry if this sounds prickish to any readers but unless you understand the difference between a themally cured acrylic and a thermoplastic acrylic please read [URL="http://dentallabnetwork.com/forums/f2/perfect-flask-9231/index2.html#post51376"]this post of mine,[/URL] and [URL="http://www.docstoc.com/docs/74778299/Dentaltown_Article_Feb2003"]this article,[/URL] specifically, the thermoplastic acrylic section, before commenting. They are different beasts. [/QUOTE]
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