impression plaster

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Related to impression plaster: impression compound, model plaster

im·pres·sion plas·ter

(im-preshŭn plastĕr)
Nonelastic impression material with excellent surface detail, but little expansion due to additives to plaster; must be broken to be removed from undercuts and then the pieces must be reattached before pouring the cast.
Medical Dictionary for the Dental Professions © Farlex 2012
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