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Medical Definition of Hygroscopic expansion
1. Expansion due to the absorption of moisture, in dental casting, the addition of water to the surface of the casting investment during setting to increase the size of the mold. (05 Mar 2000)
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1. Expansion due to the absorption of moisture, in dental casting, the addition of water to the surface of the casting investment during setting to increase the size of the mold. (05 Mar 2000)