Dental Compositions Comprising Nanoparticles Providing a Refractive Index Differential Between Polymerizable Resin and Filler
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United States of America Patent
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Feb 7, 2019
app pub date -
Feb 1, 2017
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Feb 5, 2016
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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.
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