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Firing cycles for all on 4 zirconia cases
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<blockquote data-quote="CoolHandLuke" data-source="post: 356456" data-attributes="member: 4850"><p>every material has a unique way and rate at which it conducts heat; firebricks used in casting or in ovens are classified as fireproof on the basis that you can apply a vast quantity of heat before any part of their surface begins to absorb that heat and reflect it back.</p><p></p><p>this is why copper makes for good heatsinks</p><p></p><p>its why any gold or metal crown feels cold for a few days in the oral cavity before the sensitivity dies down,</p><p></p><p>with raw or green state zirconia it conducts heat in such a way that thick areas take longer to absorb the heat than the thinner coping areas, so bridges by and large require a slower heat rise so that during the rise the hot areas don't get so hot that they separate their grains from the thicker colder areas.</p><p></p><p>the same is true on the cooling, they must be controlled in cooling for much the same reason; the bridge is now densified so heat must be removed from the unit in a controlled manner so that the areas that are thinner which cool faster, don't cool too much faster than the thicker areas otherwise the grains separate and cracks or breaks form.</p><p></p><p>hope that helps.</p></blockquote><p></p>
[QUOTE="CoolHandLuke, post: 356456, member: 4850"] every material has a unique way and rate at which it conducts heat; firebricks used in casting or in ovens are classified as fireproof on the basis that you can apply a vast quantity of heat before any part of their surface begins to absorb that heat and reflect it back. this is why copper makes for good heatsinks its why any gold or metal crown feels cold for a few days in the oral cavity before the sensitivity dies down, with raw or green state zirconia it conducts heat in such a way that thick areas take longer to absorb the heat than the thinner coping areas, so bridges by and large require a slower heat rise so that during the rise the hot areas don't get so hot that they separate their grains from the thicker colder areas. the same is true on the cooling, they must be controlled in cooling for much the same reason; the bridge is now densified so heat must be removed from the unit in a controlled manner so that the areas that are thinner which cool faster, don't cool too much faster than the thicker areas otherwise the grains separate and cracks or breaks form. hope that helps. [/QUOTE]
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Firing cycles for all on 4 zirconia cases
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