Hercules Corporation

Dentsply Research & Development Corp.

Paul A Silver

Paul D Hammesfahr

Steven R Jefferies

John Charles Subelka

Shigeyoshi Hara

Kewang Lu

Zenichiro Endo

Donald A Kapperman

Hikoichiro Yamada

Alexander Lukacs, Iii

Brian Byrne

Xiuling Wang

Barbara C Gebbia

Pierre I Croquez

A dental composite material includes a hardenable resin matrix and a filler component. The filler component includes (a) a first plurality of preferably glass particles having an average particle size of from about 1 to about 10 micrometers; (b) a second plurality of preferably glass particles having an average particle size of from about 0.1 to about 1 micrometers; and, (c) a plurality of filler particles having an average particle size of from about 0.01 to about 0.04 micrometers. A method according to the invention includes compacting a dental composite material into a prepared tooth cavity, wherein the material has a packability index above about 300 g/mm .

Dental composite restorative material and method of restoring a tooth

A method and material for forming translucent wear resistant dental enamel and the dental enamel material formed which has an opacity less than 50 percent and a localized wear volume loss of less than 0.025 mm,. The dental enamel material is formed from a polymerizable matrix and a filler. The material for forming translucent wear resistant dental enamel having an opacity less than 50 percent, a localized wear volume loss of less than 0.025 mm,and a localized extended wear volume loss of less than 0.04 mm,, comprises a polymerizable matrix forming liquid and inorganic filler particles. The liquid comprises polymerizable material having a first refractive index. The filler comprising a first plurality of particles having a second refractive index. The first plurality of particles being formed from a low and a high median particle size plurality of particles. The low median particle size plurality of particles having a median particle size between 0.1 and 1.0 micrometers. The high median particle size plurality of particles having a median particle size between 1 and 10 micrometers. The first refractive index being within 5 percent of said second refractive index. More preferably the low median particle size plurality of particles have a median particle size between 0.3 and 0.7 micrometers, and said high median particle size plurality of particles have a median particle size between 1 and 2 micrometers. More preferably the filler further comprises a second plurality of filler particles having an average particle size of from about 0.01 to about 0.04 micrometers.

Translucent wear resistant dental enamel material and method

The invention provides polymerizable dental, compounds, compositions, including the compounds and products for mixing the compositions and methods of using the compositions. Aryl acid compounds are provided in accordance with the invention. The compositions include at least one polymerizable aryl acid compound, an effective amount of a polymerization initiator, and at least 10 percent by weight of ceramic, metal and/or metal oxide filler particles having a particle size less than 500 microns. The dental products of the invention include a polymerizable composition in an enclosure having at least two chambers separated by a wall adapted to be ruptured prior to or during mixing of the composition. Compositions of the invention are preferred for use in these enclosures. Core build up material including a polymerizable acid containing compound is used to support dental crowns and adhere them to teeth in accordance with the invention.

Dental compounds, compositions, products and methods

A molded article is produced by metathesis polymerization of a mixture containing at least one metathesis polymerizable monomer, a metathesis polymerization catalyst and an organic or inorganic filler material which has been treated with a vinyl-substituted silane coupler having at least one hydrolyzable group in addition to the vinyl group.

Process for making a filled metathesis polymer article

A method is disclosed for preparing filled shaped articles of metathesis polymerized poly(cycloolefins) wherein an inorganic filler material is treated with a norbornene-substituted silane coupling agent. The norbornene moiety copolymerizes with the metathesis polymerizable monomer and the silane moiety creates a bond with the filler. Products are characterized by improved physical properties.

Molded polymer article filled with inorganic material and production of

A method of preparing a glass fiber-reinforced, crosslinked polymer structure which comprises saturating an uncoated, unsized woven glass fabric with a polymerizable liquid comprised of dicyclopentadiene and, optionally, one or more other metathesis polymerizable strained ring polycyclic cycloolefins, subjecting said saturated fabric to polymerization conditions, and, thereafter, post-curing the resultant structure at a temperature greater than about 225.degree. C., and a glass fiber-reinforced, crosslinked polymer prepared by that process, are disclosed. Post-curing at temperatures greater than 225.degree. C. enhances the physical properties of the woven fiber-reinforced, crosslinked polymer.

Improving the physical properties of glass composite

Disclosed is a composition that is polymerizable by contacting it with an olefin metathesis catalyst comprising dicyclopentadiene, red phosphorus, and a brominated aromatic compound selected from the group consisting of decabromodiphenyl oxide, N,N'-ethylene-bis-(tetrabromophthalimide), brominated polystyrene, brominated polyphenylene oxide, tetradecabromodiphenoxy benzene, tetrabromoxylene, and octabromodiphenyl oxide.

Phosphorus based flame retardant composition for reaction injection

Poly(dicyclopentadiene) having improved odor is obtained by incorporating in at least one of the parts of the two part metathesis polymerization catalyst system from about 2 to about 500 ppm (based on the weight of dicyclopentadiene) of liquid deodorant such as cyclacet, cyclaprop, .beta.-damascenone, .beta.-damascone, rose oxide, terpene C, citronellyl methyl ether, citronellyl ethyl ether, geranyl methyl ether, geranyl ethyl ether, 2,6-dimethyloctyl methyl ether, 2,6-dimethyloctyl ethyl ether, .alpha.-terpenyl methyl ether, .alpha.-terpenyl ethyl ether, methyl salicylate, methyl octin carbonate, and 1,3,5-undecatriene.

Polydicyclopentadiene having improved odor

Poly(dicyclopentadiene) made with an olefin metathesis catalyst system by a Reaction Injection Molding process is improved by adding flame retardant compounds.

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Wilmington, DE, United States of America

Paul A Silver