Multi-part dental composition having staged viscosity prior to hardening

Abstract

Disclosed herein are non-aqueous compositions including: a flowable Part A including at least one resin and Reactant A; and a flowable Part B including at least one resin and Reactant B; wherein at least one of flowable Part A and flowable Part B further includes a free radically polymerizable resin; wherein at least one of flowable Part A and flowable Part B further includes a free radical initiator system; wherein flowable Part A and flowable Part B are capable of being mixed to provide a flowable mixed composition; wherein when flowable Part A and flowable Part B are mixed, Reactant A and Reactant B are capable of interacting to cause a non-free radical reaction within a first staging time to provide a first staged stable consistency for the mixed composition; wherein Reactant A comprises an acid and Reactant B comprises a base, and upon mixing flowable Part A and flowable Part B, the Reactant A acid is capable of reacting with the Reactant B base in an ionic acid-base reaction; and wherein the mixed composition having the first staged stable consistency is capable of forming a hardened dental composition upon initiation of free radical polymerization.

1 . A non-aqueous composition comprising:
 a flowable Part A comprising at least one resin and Reactant A; and   a flowable Part B comprising at least one resin and Reactant B;   wherein at least one of the resins of flowable Part A and flowable Part B further comprise a free radically polymerizable resin;   wherein at least one of flowable Part A and flowable Part B further comprises a free radical initiator system;   wherein flowable Part A and flowable Part B are capable of being mixed to provide a flowable mixed composition;   wherein when flowable Part A and flowable Part B are mixed, Reactant A and Reactant B are capable of interacting to cause a non-free radical reaction within a first staging time to provide a first staged stable consistency for the mixed composition that is lower than the arithmetic mean of the consistency of flowable Part A and the consistency of flowable Part B;   wherein Reactant A comprises an acid and Reactant B comprises a base, and upon mixing flowable Part A and flowable Part B, the Reactant A acid is capable of reacting with the Reactant B base in an ionic acid-base reaction; and,   wherein the mixed composition having the first staged stable consistency is capable of forming a hardened dental composition upon initiation of free radical polymerization.   
     
     
         2 - 29 . (canceled) 
     
     
         30 . A method of preparing a composition having a first staged stable consistency, the method comprising:
 providing a non-aqueous composition according to  claim 1 ;   mixing flowable Part A and flowable Part B to provide a mixed composition; and   allowing the consistency of the mixed composition to decrease to a first staged stable consistency that is lower than the arithmetic mean of the consistency of flowable Part A and the consistency of flowable Part B.   
     
     
         31 . A method of preparing a hardened dental composition, the method comprising:
 providing a non-aqueous composition according to  claim 1 ;   mixing flowable Part A and flowable Part B to provide a mixed composition;   allowing the consistency of the mixed composition to decrease to a first staged stable consistency that is lower than the arithmetic mean of the consistency of flowable Part A and the consistency of flowable Part B; and   subjecting the mixed composition having the first staged stable consistency to conditions sufficient to initiate free radical polymerization to provide the hardened dental composition.   
     
     
         32 - 35 . (canceled) 
     
     
         36 . A device for storing a non-aqueous composition according to  claim 1  comprising:
 a first compartment containing flowable Part A; and 
 a second compartment containing flowable Part B. 
 
     
     
         37 . (canceled) 
     
     
         38 . A method of preparing a composition having a first staged stable consistency, the method comprising:
 providing a device according to  claim 36 ;   combining flowable Part A and flowable Part B to provide a mixed composition; and   allowing the consistency of the mixed composition to decrease to a first staged stable consistency that is lower than the arithmetic mean of the consistency of flowable Part A and the consistency of flowable Part B.   
     
     
         39 . A method of preparing a hardened dental composition, the method comprising:
 providing a device according to  claim 36 ;   combining flowable Part A and flowable Part B to provide a mixed composition;   allowing the consistency of the mixed composition to decrease to a first staged stable consistency that is lower than the arithmetic mean of the consistency of flowable Part A and the consistency of flowable Part B; and   subjecting the mixed composition having the first staged stable consistency to conditions sufficient to initiate free radical polymerization to provide the hardened dental composition.