Abstract: Methods of recording a muco-dynamic or immediate functional impression of the dental arches of a patient onto the base or peripheral borders of a prosthetic denture, or rebasing a patient's prosthetic denture, utilizing a non-ionic, non-hydrophilic, impression-forming composition comprising polyvinyl acetate, aliphatic ketones, aliphatic esters, aliphatic alcohols or aliphatic ethers, non-toxic, non-aromatic, plasticizing oils and non-toxic and non-extractable organic pigments.

Abstract: Compositions, with controlled and programmed hardening, to record mucodynamic dental impressions, characterized in that they comprise:______________________________________ Polyvinyl acetate (PVAc) 50-85% by weight C.sub.3 to C.sub.6 aliphatic ketones 2-25% by weight C.sub.3 to C.sub.8 aliphatic esters 1-25% by weight C.sub.2 to C.sub.10 aliphatic alcohols 1-25% by weight and/or aliphatic ethers Non-toxic, non-aromatic 0.5-10% by weight plasticizing oils selected from the group consisting of dioctyl adipate, glycerol triacetate and polyglycols Non-toxic and non-extractable 0-2% by weight black, yellow, red or white organic pigments or a combination thereof ______________________________________and is free of any gel-forming components, peroxide-based catalysts, aromatic compounds and incompatible plasticizers.