Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Compositions to be polymerized by wave energy wherein said...
Reexamination Certificate
1999-05-19
2001-02-27
Berman, Susan W. (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Compositions to be polymerized by wave energy wherein said...
C522S081000, C522S083000, C522S079000, C522S071000, C522S103000, C522S182000, C522S908000, C523S115000, C523S116000, C524S398000, C524S413000
Reexamination Certificate
active
06194481
ABSTRACT:
The present invention relates to alkene finctionalized zirconium oxide nanoparticle composites with polymerizable alkene matrix monomers. The composites are primarily suitable for dental and medical restoration; however, optical resins for use in high refractive index applications such as eyeglasses, resins for advanced prototyping, and adhesive applications also are possible.
BACKGROUND OF THE INVENTION
Colloidal silica nanoparticles currently are used as fillers in “microfilled” composite dental restorative resins. These particles can increase the hardness and wear resistance of photocured matrix polymers; however, the particles are not radiopaque and cannot be homogeneously dispersed within the matrix resin because of interparticle associations. The resulting coagulation leads to a substantial increase in viscosity and a consequent decrease in composite workability. This places a severe limitation on the practical filler loading in “microfilled” composites.
The loading problem can be partially offset by incorporating prepolymerized organic fillers into the resin in which a relatively high level of colloidal silica is incorporated into highly crosslinked polymeric granules. The workability of the composite resins containing these fillers is maintained, and the cure shrinkage is somewhat reduced. However, the fillers also yield failure prone interfaces and cause a high degree of light scattering, thereby limiting the depth of cure.
Photocurable dental repair materials are needed which are transparent or translucent, radioopaque, have good workabililty, and have good mechanical strength and stability.
SUMMARY OF THE INVENTION
The present invention provides a composition photopolymerizable into transparent or translucent solids comprising a matrix comprising monomers comprising a photopolymerizable unsaturated carbon-carbon bond, particles comprising zirconium oxide, the particles having a diameter in nanometers which is small enough to provide sufficient transparency but large enough to provide effective fracture toughness after photopolymerization, wherein the particles comprise a surface comprising hydroxyl groups, a first portion of the hydroxyl groups being bonded to a silicon atom of a silanating agent effective to increase hydrophobicity of the surface in an amount sufficient to allow the particles to be homogeneously dispersed in a hydrophobic resin, a second portion of the hydroxyl groups being bonded to a functionality selected from the group consisting of a zirconium atom of a photopolymerizable, hydrolyzable zirconate, and a zirconium atom or an aluminum atom of a photopolymerizable zircoaluminate.
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Dixon Hong
Furman Benjamin R.
Norling Barry K.
Rawls Henry R.
Wellinghoff Stephen T.
Berman Susan W.
Board of Regents of the University of Texas System
Paula D. Morris & Associates P.C.
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