Dental compositions comprising nanoparticles providing a refractive index differential between polymerizable resin and filler

US11246808B2 · kind B2 · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

• Bradley D. Craig · Lake Elmo, US
• Timothy D. Dunbar · Woodbury, US
• Karsten Dede · Landsberg, DE
• Adrian S. Eckert · Herrsching am Ammersee, DE
• Ahmed S. Abuelyaman · Woodbury, US
• Gregory A. Kobussen · Woodbury, US
• Christoph Thalacker · Weilheim, DE
• Paul J. Homnick · Lake Elmo, US

Key dates

• Filing date: Feb 1, 2017
• Grant date: Feb 15, 2022
• Expiry date: Feb 1, 2037

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61K6/887
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

Dental compositions and methods of formulating a dental composition are described. In one embodiment, the dental composition comprises a polymerizable resin comprising one or more ethylenically unsaturated monomers or oligomers and nano-particles. The nanoparticles have a refractive index of at least 1.600 and an average discrete or aggregate particle size of no greater than 100 nm. The dental composition further comprises inorganic metal oxide filler having a discrete or aggregate average particle size of at least 200 nm. The nanoparticles are present at a concentration to provide a refractive index differential between the cured polymerizable resin and inorganic metal oxide filler such that the contrast ratio of the dental composition is at least 40.