低温强化处理对口腔修复中高熔铸造合金三维量度的影响

The Effect of Cryotreat on the Size of the Medium and High Melting Point Castable Alloys

考察了在低温强化处理过程中不同的降温速率对口腔修复常用铸造合金三维量度的影响，旨在了解此方法应用于口腔修复的可行性，并为选择适用于中、高熔铸造合金的处理曲线提供依据。结果表明：１．快速降温法引起的合金变形量最为显著；２．３℃／ｍｉｎ和１℃／ｍｉｎ的降温速率均不会引起合金尺寸的显著性变化；３．３℃／ｍｉｎ和１℃／ｍｉｎ的降温速率所引起的合金微小变形量间无显著性差异；４．快速降温法和缓慢降温法（３℃／ｍｉｎ和１℃／ｍｉｎ）所产生的合金变形量间有显著性差异。提示：在适当的降温速率下，低温强化处理不会引起合金的明显变形。３℃／ｍｉｎ的降温速率适用于处理中高熔铸造合金。

Castable alloys are widely used in prosthodontics. The properties of alloys can be improved by cryotreat. This method may cause a size alteration of materials. This study revealed the effects of different cooling rates on the size of the castable alloys. The results showed: 1. The rapid cooling rate caused significant deformation of the alloys. 2. The 3℃/min rate and the 1℃/min rate did not cause any significant deformation of the alloys. 3. The 3℃/min rate and the 1℃/min rate did not show any difference in their deformation causing ability. 4.The rapid cooling rate and the slow cooling rate (3℃/min and 1℃/min) showed significant difference in their deformation causing ability.These results suggested that 3℃/min was recommendable as a cooling rate of the cryotreat of the medium and high melting point castable alloys.