What is the role of investment expansion in casting accuracy?

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Multiple Choice

What is the role of investment expansion in casting accuracy?

Investment expansion is the mechanism that makes the mold grow just enough to offset the metal’s shrinkage as it cools and solidifies, as well as the burnout and removal of the wax pattern. By expanding during setting and again when heated for burnout and casting, the final casting ends up matching the prepared tooth or die with accurate margins and fit. If the expansion is too little, the casting will be undersized and won’t seat properly; if it’s too much, the casting may be oversized or have improper margins. This effect directly influences fit, while setting time and color are not determined by this expansion.

Investment expansion is the mechanism that makes the mold grow just enough to offset the metal’s shrinkage as it cools and solidifies, as well as the burnout and removal of the wax pattern. By expanding during setting and again when heated for burnout and casting, the final casting ends up matching the prepared tooth or die with accurate margins and fit. If the expansion is too little, the casting will be undersized and won’t seat properly; if it’s too much, the casting may be oversized or have improper margins. This effect directly influences fit, while setting time and color are not determined by this expansion.

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