Low shrinkage and low stress dental compositions

Abstract

A composition of macrocyclic oligomer with at least one polymerizable group, (meth)acrylate, for example.

1 . A dental composition comprising a macrocyclic oligomer with at least one (meth)acrylate polymerizable group. 
     
     
         2 . A method of preparing a dental composition comprising a polymerizable macrocyclic oligomer, comprising the step of preparing an activated precursor of an oligomer at pseudo high-dilution conditions. 
     
     
         3 . A method claimed in  2 , wherein said activated precursor is liquid, crystalline solid or a combination of both. 
     
     
         4 . A method as in  claim 2 , wherein said precursor itself is polymerizable. 
     
     
         5 . A method as in  claim 2 , comprising the step of reacting said precursor with a coupling agent selected from the group consisting of primary diols, secondary amines, diacids and combinations thereof. 
     
     
         6 . A method as in  claim 5 , wherein said coupling agent is aliphatic, aromatic or both. 
     
     
         7 . A method of preparing a dental composition comprising a polymerizable macrocyclic oligomer, comprising the step of preparing an activated precursor of an oligomer by reacting said precursor with an activated coupling agent, wherein said precursor is condensable and polymerizable.