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 composition of macrocyclic oligomer with at least one polymerizable group, (meth)acrylate, for example.  
     
     
         2 . As claimed in 1, such a polymerizable macrocyclic oligomer was prepared at pseudo high-dilution condition, started from activated precursor.  
     
     
         3 . As claimed in 2, such an activated precursor could be liquid and/or crystalline solid.  
     
     
         4 . As claimed in 2, this precursor itself is polymerizable.  
     
     
         5 . As claimed in 2, various coupling agents such as primary diols, secondary amine or diacids could be used.  
     
     
         6 . As claimed in 5, the moiety could aliphatic or aromatic or both.  
     
     
         7 . As claimed in 2, the macrocyclic could also be prepared from an activated coupling agent with condensable, polymerizable precursor as well.  
     
     
         8 . Any composition contains at lest 30-70% of the polymerizable macrocyclic oligomer to realize control on polymerization shrinkage.  
     
     
         9 . Any composition contains at lest 10-30% of the bulky monomethcrylate as diluent to realize control on polymerization stress.