Glass ionomer cement, process of production and use thereof european Patent Office ep 3079645 B1
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EP14821383NWB1
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- Claims 1.
EP 3 079 645 B1
15 5 10 15 20 25 30 35 40 45 50 55 [0159] What can be seen is: The mechanical properties like compressive strength determined for the compositions according to the invention are better than the respective values determined for commercialized glass ionomer compositions. Further, compared to the commercially available glass ionomer products, the composition according to the invention can be stored without the need of a humidity tight secondary packaging. Claims 1. A kit of parts for preparing a glass ionomer cement for dental use, the kit comprising a Part A and a Part B Part A being a powder and comprising - an acid-reactive inorganic filler in an amount from above 60 to 95 wt.%, the acid-reactive filler having a mean particle size in the range of 3.5 to 10 mm, - an non acid-reactive inorganic filler in an amount above 5 to 30 wt.%, the non acid-reactive filler having a mean particle size in the range of 1.0 to 3.5 mm, - Part A not comprising a polyacid in an amount above 1 wt.%, wt.% with respect to the weight of Part A, Part B being a liquid and comprising - a polyacid in an amount above 35 to 60 wt.%, - water, - a complexing agent, wt.% with respect to the weight of Part B, the weight ratio of Part A to Part B being from 2 : 1 to 4 :1, wherein the mean particle size is determined by laser diffraction as the arithmetic average of the measured grain size or the respective powder. 2. The kit according to claim 1, neither Part A nor Par B comprising at least one or more or all of the following components in an amount above about 1 wt.% with respect to each of the components listed and: • HEMA, • polymerizable component(s), • initiator component(s) suitable to cure polymerizable component(s) or monomer(s), • desiccant(s), • apatite or hydroxyl apatite, • inhibitor(s). Product Ionofil ™ Molar (Voco) Example 1 Example 2 Powder Polyacrylic acid 2.5 - 5 %; silicium dioxide 2.5-5 %; L- Tartaric acid 2.5 - 5 % (acc. to MSDS) GP 80 %; QA1 20 % GP 80 %; Sr Al B silicate glass powder 20 % Liquid Polyacrylic acid solution 50 - 100 % (acc. to MSDS) Poly (acrylic acid co maleic acid) 43.6 %; water 47.2 %; tartaric acid 9.1 %; benzoic acid 0.1 % Poly (acrylic acid co maleic acid) 43.6 %; water 47.2 %; tartaric acid 9.1 %; benzoic acid 0.1 % FS [MPa] 54.8 6 6.8 52.1 6 5.5 46.4 6 1.8 CS [MPa] 201.5 6 16.6 271.5 620.9 241.0 6 18.7 Secondary packaging of dental capsule Aluminum based foil; humidity tight Plastic based foil; no humidity protection needed Plastic based foil; no humidity protection needed |
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