Dental resin cements having improved handling properties

A - Human Necessities – 61 – K

Patent

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A61K 6/083 (2006.01) A61K 6/00 (2006.01) A61K 6/087 (2006.01)

Patent

CA 2295502

Dental resin cement materials having unique handling properties are provided that comprise a) filler, b) polymerizable resin, and c) a polymeric handling modifier that is dispersed in the polymerizable resin at 25 ~C and that has a molecular weight of between about 500 and 100,000. Components a) b) and c) are present in an amount effective to achieve a Viscosity vs Shear Rate Curve that fits a power law model of F(x)= A x B. The correlation value of the material to this curve is greater than 0.85 for both the increasing and decreasing shear rate curves, and the value of B is less than about -0.01. Resin cements are also provided that comprise acid functionality and water, but which do not comprise an acid reactive filler. Such cements may be self etching, thereby avoiding the need to carry out a separate acid etch step.

L'invention concerne des matériaux ciments dentaires à base de résine présentant des propriétés de traitement uniques, qui comprennent a) une charge, b) une résine polymérisable et c) un modificateur de traitement polymère, dispersé dans ladite résine à 25 ·C et ayant un poids moléculaire compris entre 500 et 100000. Les composants a), b) et c) sont présents en une quantité efficace pour donner une courbe viscosité sur vitesse de cisaillement qui suit le modèle de loi exponentielle F(x) = A x?B¿. La corrélation du matériau avec cette courbe est supérieure à 0,85, aussi bien pour les courbes d'augmentation que de diminution de la vitesse de cisaillement, et la valeur de B est inférieure à -0,01 environ. L'invention concerne également des ciments à base de résine qui contiennent une fonctionnalité acide et de l'eau, mais pas de charge réactive acide. Ces ciments peuvent se mordancer spontanément, ce qui dispense d'une étape distincte de mordançage par acide.

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