| 摘要 |
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-]x-A, wherein x is an integer greater than 1; A is a fluorinated alkoxy group having the formula F3C(CF2)n(CH2)mO- 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:Me3Si-[-OSiMeR1-]-[-OSiMeR1-]o-[-OSiMeR-]q-OSiMe3wherein 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 R1 is a polyoxyalkylene substituent having the formula-(-CH2)3-(DO)a(EO)b(FO-)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 CH2CH2O, EO is CH2CH2(CH3)O, and FO is CH2CH2O. Use of the foregoing polysiloxane polyester polymer results in a dental impression material with optimal hydrophilicity, increased tear strength, and improved water adsorption.
|
