DENTURE BASE MATERIAL THAT IS FRACTURE-RESISTANT AFTER CURING AND IS OBTAINED FROM AUTOPOLYMERIZING OR COLD-POLYMERIZING COMPOSITIONS
A fracture-resistant denture base material is obtained from an auto-polymerising or cold-polymerising composition containing (A) a liquid monomer component; (B) a powder-shaped component, and (C) at least one initiator or one initiator system for auto- or cold-polymerisation, whereby at least one member of the groups of aliphatic urethane acrylates and aliphatic urethane methacrylates is present in (A) or/and (B); whereby the fracture-resistant material shows, in particular, a fracture toughness of >1.8 MPa*m 1/2 and a fracture work of >400 J/m 2 after curing, and, preferably also shows a difference in the yellow value, also called b value, of maximally one unit after 8 weeks of storage in fully desalted water at 50° C. Preferably, no synthetic rubber is present.
1 . Denture base material, obtained from an auto-polymerizing or cold-polymerizing composition that contains
(A) a liquid monomer component;
(B) a powder-shaped component;
(C) at least one initiator or one initiator system for auto- or cold-polymerization, wherein at least one member of the group consisting of aliphatic urethane acrylates and aliphatic urethane methacrylates is present in components (A) or/and (B).
2 . Denture base material according to claim 1 , wherein at least one liquid aliphatic urethane diacrylate resin composed of aliphatic urethane and acrylic segments is present in component (A), and the composition is free of plasticizing synthetic rubber.
3 . Denture base material according to claim 1 , having a fracture toughness of >1.8 MPa*m 1/2 and a fracture work of >400 J/m 2 after curing.
4 . Denture base material according to claim 1 , which shows a difference of maximally one unit in the yellow value, also called b value, after 8 weeks of storage in fully desalted water at 50° C.
5 . Denture base material according to claim 1 , wherein the fraction of aliphatic urethane acrylate and/or urethane methacrylate is 0.5 to 20% by weight.
6 . Denture base material according to claim 5 , wherein the fraction of aliphatic urethane acrylate and/or urethane methacrylate is 0.1 to 5% by weight.
7 . Denture base material according to claim 1 , wherein the aliphatic urethane acrylate and/or urethane methacrylate has aliphatic urethane segments and (meth)acrylate segments in the polymer structure.
8 . Denture base material according to claim 1 , wherein the aliphatic urethane acrylate and/or urethane methacrylate is colorless and transparent.
9 . Denture base material according to claim 1 , wherein the aliphatic urethane acrylate and/or urethane methacrylate has no inherent odour.
10 . Denture base material according to claim 1 , obtained from an auto-polymerizing or cold-polymerizing composition containing components (A), (B), and (C), which, in addition, contains one or more substances selected from the group consisting of filling agents, pigments, stabilisers, modifiers, antimicrobial additives, UV-absorbing agents, thixotroping agents, catalysts, further monomers, and cross-linkers.
11 . Hoof repair materials bone cement for cementing artificial articular prostheses and orthodontic appliances comprising the denture base material of claim 1 .
12 . Modifying agent in compositions for auto- or cold-polymerising denture base material comprising a member of the group consisting of aliphatic urethane acrylates and aliphatic methacrylates.
13 . Modifying agent according to claim 12 , whereby the modifying agent is a liquid aliphatic urethane diacrylate resin composed of aliphatic urethane and acrylic segments.
14 . Modifying agent according to claim 12 , wherein the compositions are free of plasticizing synthetic rubber.
15 . Modifying agent according to claim 12 , wherein no adverse effect on the results of the sun test according to ISO 20795 occurs.