Composite materials having a low shrinkage force

Details Composite materials having a low shrinkage force Composite materials having a low shrinkage force

A - Human Necessities

61

K

A61K 6/083 (2006.01)

Patent

CA 2544991

For composite materials having a total filler content of 80 to 95% by weight, containing A) 0.5 to 10% by weight of non-agglomerated nanofillers having particle sizes of 1 to 50 nm in the filler component, B) at least 60% by weight of a filler mixture of 50 to 90% coarse-particle and 10 to 50% fine-particle dental glass in the filler component, having a size ratio, relative to the average particle size (d50 value), of coarse to fine particles of > 1:4 to 1:30, C) as monomer component, a monomer mixture of i. 60 to 80% bis-GMA or TCD-di-HEMA or TCD-di-HEA, ii. 10 to 18% UDMA, iii. Residual TEDMA and/or multifunctional crosslinkers, D) up to 1 % photoinitiator(s); and E) optionally, at least one additional dental glass in the filler component having a different particle size than the coarse- and fine-particle dental glass, the polymerization shrinkage may be reduced to < 1.6% by volume (measured according to the bonded disk method; Dental Materials (2004) 20, 88-95), and the shrinkage force (measured according to the photoelastic method; Dental Materials (2004) 20, 313-321) may be reduced to < 3.5 MPa (measured 24 hours after polymerization).

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