Verwendung einer Zusammensetzung als Dentalmaterial und Dentalmaterial

EP 804919 A UPAB: 20000718 Use of a composition as dental material is claimed. The composition contains: (A) silica condensation reaction product(s) of a hydrolysable and polymerisable norbornene silane compound of formula (Ia); or (B) silica condensation reaction product(s) of a hydrolysable and polymerisable mercaptosilane compound of formula (Ib): R0 = hydrogen or 1-8C alkyl; R = 1-8C alkyl, 2-8C alkenyl or 6-10C aryl (any of which may contain oxygen, sulphur, -O-CO-, -CO-O- or NH groups in the carbon chain or as end groups), or hydrogen or R2-R1-R4-SiXxR33-x; R1, R2 = 1-8C alkylene, 6-14C arylene, 6-14C alkylene-arylene or 6-14C arylene-alkylene (any of which may contain oxygen, sulphur, -O-CO-, -CO-O- or NH groups in the carbon chain or as end groups); R3 = 1-10C alkyl, 2-10C alkenyl or 6-10C aryl (any of which may contain oxygen or sulphur atoms in the carbon chain or in end groups); R4 = -(CHR6-CHR6)n-, -CHR6-CHR6-S-R5-, -CO-S-R5-, -CHR6-CHR6-NR6-R5-, -S-R5-, -Y-CO-NH-R5 or -CO-O-R5-; R5 = 1-8C alkylene or 6-10C arylene (any of which may contain oxygen, sulphur, -O-CO-, -CO-O- or NH groups in the carbon chain or as end groups); and R6 = hydrogen, 1-10C alkyl or 6-10C aryl. [(HS-R7)fR8]gSiXhR94-g-h (Ib) R7 = 1-10C alkylene, 6-14C arylene or 6-14C alkylarylene (any of which may contain oxygen, sulphur, -O-CO-, -CO-O- or NH groups in the carbon chain or as end groups); R8 = 1-10C alkylene, 2-10C alkenylene, 6-14C arylene or 6-14C alkylarylene (any of which may contain oxygen, sulphur, -O-CO-, -CO-O- or NH groups in the carbon chain or as end groups); R9 = 1-10C alkyl, 2-10C alkenyl, 6-14C arylene or 6-14C alkylarylene (any of which may contain oxygen, sulphur, -O-CO-, -CO-O- or NH groups in the carbon chain or as end groups); X = hydrolysable group, preferably halogen, hydroxyl or alkoxy; Y = oxygen, sulphur or NR6; Z = oxygen or CHR6; a, b, g, h, x = 1-3; c = 1-6; f = 1-4; and n = 0-1, with the provision that either a and/or b = 1; and a + x = 2-4. USE - The materials are used as dental cements, fillings or bonding agents for fillings (claimed). ADVANTAGE - The dental materials shrink very little following polymerisation to form a composite that displays improved mechanical strength and hardness.