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Abstract

A dental impression composition for use in the preparation of the oral tissue models comprising a dimethicone-based polysiloxane polyester polymer having terminal fluorinated alkoxy substituents such that the fluorine content of the polysiloxane polyester is in the range from about 5% to about 30% by weight, and having the general formula A--?--B--C--!.sub.x --A, wherein x is an integer greater than 1; A is a fluorinated alkoxy group having the formula F.sub.3 C(CF.sub.2).sub.n (CH.sub.2).sub.m O-- wherein n is an integer from 3 to 17 and m is an integer from 2 to 4; B is a diacid; and C is a dimethicone-based polysiloxane copolyol having the formula: Me.sub.3 Si--?--OSiMeR.sup.1 --!--?--OSiMeR.sup.1 --!.sub.o --?--OSiMeR--!.sub.q --OSiMe.sub.3 wherein Me is methyl, R is methyl or phenyl, o is an integer in the range from 1 to 19, q is an integer in the range from 0 to 200, and R.sup.1 is a polyoxyalkylene substituent having the formula --(--CH.sub.2).sub.3 --(DO).sub.a (EO).sub.b (FO--).sub.c -- wherein the propyl groups is linked to the silicon atom and DO, EO, and FO are the same or different, being linear or branched oxyalkylene groups having from 2 to 6 carbons, a and b are each independently integers in the range from 1 to 19, and c is an integer from 1 to 20. Preferably, DO is CH.sub.2 CH.sub.2 O, EO is CH.sub.2 CH.sub.2 (CH.sub.3)O, and FO is CH.sub.2 CH.sub.2 O. Use of the foregoing polysiloxane polyester polymer results in a dental impression material with optimal hydrophilicity, increased tear strength, and improved water adsorption.

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First Claim