hygroscopic expansion


hy·gro·scop·ic ex·pan·sion

1. expansion due to the absorption of moisture; 2. in dental casting, the addition of water to the surface of the casting investment during setting to increase the size of the mold.

hy·gro·scop·ic ex·pan·sion

(hīgrō-skopik eks-panshŭn) 1. Expansion due to absorption of moisture. 2. In dental casting, addition of water to surface of casting investment during setting to increase the size of the mold.