Why should dental casts not be placed under running tap water?

Show Answers

Water disrupts the hygroscopic expansion processWater prevents the polymerization of dental resin materialsWater affects the crystallization of dihydrate compoundsGypsum partially dissolves in water, causing surface damage to the cast

Explanation

Option A is incorrect because water does not affect hygroscopic expansion in this context. Option B is irrelevant since polymerization inhibition applies to resin, not gypsum casts. Option C is not accurate as crystallization of dihydrate is not hindered by water exposure. The correct answer is D: gypsum is slightly soluble in water, so placing the cast under tap water can erode its surface.