Radical polymerization inhibitors for light-curable dental materials
a technology polymerization inhibitors, which is applied in the field can solve problems such as the physical properties of light-curable dental materials to be reduced
Inactive Publication Date: 2011-08-11
BLACKWELL GORDON
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Benefits of technology
"The invention provides a light-curable dental material that can be extended in its working time without compromising its physical properties. This is achieved by adding a 1,3-dipolar compound as a polymerization inhibitor. The 1,3-dipolar compound prevents premature polymerization of the dental material by stabilizing or trapping one-electron oxidized or reduced radical states. The invention also provides a use of a 1,3-dipolar compound in a light-curable surface coating, light-curable ink, or light-curable adhesive material as a polymerization inhibitor. The 1,3-dipolar compound has low color, is stable, and does not impair the physical properties of the cured materials."
Problems solved by technology
Very often a relatively strong ambient light is needed so that the modelling or application can be carried out with the necessary precision, which leads to several conflicts.
However both of these measures can lead to a decrease in the physical properties of the light-cured dental material.
Method used
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1 AND 2
[0064]Preparation of experimental resin mixtures: Resin mixtures were prepared with initiator and co-initiator concentrations as given in Table 1 by first mixing together UDMA (5 parts), HPGM (5 parts), TMPTMA (5 parts), and EBA (85 parts). The initiators, inhibitors and the 1,3-dipolar compounds were then added as required in the amounts shown in the table, and dissolved by stirring at 40-50° C. until no solid particles remained.
[0065]In the examples shown, camphor quinone was used as photoinitiator, since the 1,3-dipolar compounds used absorb at wavelengths less than 400 nm. The possibility of using a 1,3-dipolar compound that has a significant absorption at wavelengths longer than 400 nm and is capable of acting as a photoinitiator is however not excluded.
[0066]Preparation of dental composites: The chosen resin mixture (33.0 g), Aerosil R972 (0.75 g), and silanated glass with a mean particle size of about 0.8 μm (116.25 g) were kneaded together at 40° C. in a vertical knea...
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Abstract
The invention relates to light-curable dental materials comprising at least one polymerizable compound, a photopolymerization initiator and a polymerization inhibitor.
Description
FIELD OF THE INVENTION[0001]The present invention relates to light-curable dental materials, such as dental composites, comprising at least one polymerizable compound, a photopolymerization initiator and a polymerzation inhibitor.BACKGROUND TO THE INVENTION[0002]Radical polymerisation of ethylenically unsaturated compounds is widely used to harden dental materials such as dental filling materials. In light-curable dental materials, the ethylenically unsaturated compounds are activated to be polymerisable by the application of light, since this allows a “command cure”. By this means the ethylenically unsaturated substances remain workable for an indefinite time, but can be cured at will in a short time by the application of light. Generally the actinic light has a wavelength between about 200 nm and 700 nm, and more often between about 300 nm and 600 nm. In light-curable dental compositions, camphor quinone which allows photopolymerization with visible light is almost exclusively use...
Claims
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IPC IPC(8): A61K6/083C08F2/50A61K6/10A61K6/90
CPCA61K6/0017A61K6/0023A61K6/083A61K6/0835A61K6/10A61C19/003C08L33/00A61K6/62A61K6/889A61K6/90A61K6/20A61K6/30A61K6/887
Inventor BLACKWELL, GORDON
Owner BLACKWELL GORDON