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Lab talk, the good, the bad, and the ugly
Dental-CAD
e.max Press - printed wax questions...
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<blockquote data-quote="Mohammad Khair" data-source="post: 153728" data-attributes="member: 12591"><p>well, it is really does not matter what material you cast or press into investment mold.</p><p></p><p>it is regarding the investment material control,the dental companies in general stop producing the gypsum bonded investment material and stop also producing silica bonded investment material long time ago.</p><p>99.99 of the investment martial in the dental world is a phosphate bonded investment,</p><p>for pressing technique and for casting technique.</p><p>the expansion control for such a material is related to its liquid concentration.</p><p></p><p>the more liquid the more expansion for all dental investment material.</p><p></p><p>more expansion means the cast or the pressed object will be bigger in size,</p><p>bigger in size means loose crown or tighter post or inlay.</p><p></p><p>this expansion is made to compensate the shrinkage of a hot molten material, when the said molten material is start to harden.</p><p></p><p>so all the dental investment is acting the same, and so does any molded molten material</p><p>the difference is only in range of expansion, size of the particles and hardness of the materials.</p><p></p><p>now a dental technician can have a little control of this process by controlling the liquid to water ratio.</p><p>adding more liquid means bigger pressed object or/and bigger cast object and vise versa.</p></blockquote><p></p>
[QUOTE="Mohammad Khair, post: 153728, member: 12591"] well, it is really does not matter what material you cast or press into investment mold. it is regarding the investment material control,the dental companies in general stop producing the gypsum bonded investment material and stop also producing silica bonded investment material long time ago. 99.99 of the investment martial in the dental world is a phosphate bonded investment, for pressing technique and for casting technique. the expansion control for such a material is related to its liquid concentration. the more liquid the more expansion for all dental investment material. more expansion means the cast or the pressed object will be bigger in size, bigger in size means loose crown or tighter post or inlay. this expansion is made to compensate the shrinkage of a hot molten material, when the said molten material is start to harden. so all the dental investment is acting the same, and so does any molded molten material the difference is only in range of expansion, size of the particles and hardness of the materials. now a dental technician can have a little control of this process by controlling the liquid to water ratio. adding more liquid means bigger pressed object or/and bigger cast object and vise versa. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Dental-CAD
e.max Press - printed wax questions...
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