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Dispersions of nanoscale dental glass particles and methods for preparing the same

A dispersion and nano-scale technology, applied in dental preparations, dental prostheses, dentistry, etc., can solve the problems of huge difference in refractive index and poor transparency, and achieve high X-ray opacity

Inactive Publication Date: 2014-07-23
SCHOTT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large difference in the refractive index of the filler material and the matrix, poor transparency must also be expected here

Method used

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  • Dispersions of nanoscale dental glass particles and methods for preparing the same
  • Dispersions of nanoscale dental glass particles and methods for preparing the same
  • Dispersions of nanoscale dental glass particles and methods for preparing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] Example 1: Using barium perchlorate as precursor and hydroxypropyl cellulose as sol Stabilizer SiO 2 -Dispersion of BaO nanoparticles in di-GMA / TEG-DMA matrix

[0095] Step a): Synthesis of Particles

[0096] Solution A:

[0097] Dissolve 8 g of anhydrous barium perchlorate in 238 ml of ethanol. To stabilize the solution, 1.2 ml of acetylacetone was added. Then, 26.8 ml of TEOS was added to the solution.

[0098] Solution B:

[0099] Mix 278ml of ethanol with 29ml of 25% NH 4 OH solution, and 3 g of hydroxypropyl cellulose (HPC) was added as a sol stabilizer. The solution was stirred until the sol stabilizer was dissolved.

[0100] To start the reaction, solution A was added rapidly to solution B with vigorous stirring. Then, the reaction mixture was stirred for 24 hours. As a result of particle formation, the solution gradually became cloudy.

[0101] Step b): Surface modification

[0102] To silylate the particles synthesized in step a), 2.8 ml ...

Embodiment 2

[0109] Example 2: Using 3-methacryloxypropyltrimethoxysilane (MPTMS) as A sol stabilizer with a di-GMA / TEG-DMA mixture as a matrix monomer SiO 2 - Dispersion of BaO nanoparticles

[0110] Steps a) and b): Synthesis and silanization of particles

[0111] Solution A:

[0112] Dissolve 8 g of anhydrous barium perchlorate in 214 ml of ethanol. To stabilize the solution, 1.2 ml of acetylacetone was added. Then, 12.3 ml of TEOS was added to the solution. Then, 13.1 ml of 3-methacryloxypropyltrimethoxysilane (MPTMS) was added to the solution.

[0113] Solution B:

[0114] Mix 252ml of ethanol with 26ml of 25% NH 4 OH solution mixed.

[0115] To start the reaction, solution B was quickly added to solution A with vigorous stirring. Then, the reaction mixture was stirred for 24 hours. As a result of particle formation, the solution gradually became cloudy.

[0116] Step c): Separation of counter ions

[0117] In order to remove the perchlorate ions present in th...

Embodiment 3

[0122] Embodiment 3: use Ba(OH) 2 as BaO precursor

[0123] Steps a) and b): Synthesis and silanization of particles

[0124] Solution A:

[0125] Put 220ml of ethanol in the reaction vessel, first add 12.3ml of tetraethoxysilane and 13.1ml of 3-methacryloxypropyltrimethoxysilane (MPTMS) under stirring, then add 1.4ml of methacrylic acid to To stabilize the solution, finally, 71.5ml of saturated barium hydroxide solution (i.e. 4.6% Ba(OH) 2 aqueous solution) was added to the mixture.

[0126] Solution B:

[0127] Mix 256ml of ethanol with 85ml of 2M NH 3 Solutions in ethanol were mixed.

[0128] To start the reaction, solution B was quickly added to solution A with vigorous stirring. Then, the reaction mixture was stirred for 24 hours. As a result of particle formation, the solution gradually became cloudy.

[0129] Step c): Separation of counter ions

[0130] In order to remove the methacrylate ions present in the reaction mixture, the solution was filtere...

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Abstract

The invention relates to dispersions of nanoscale dental glass particles and methods for preparing the same. Provided are a dispersion of a nanoparticulate mixed oxide of SiO2 with at least one further metal oxide in a matrix monomer, methods for preparing such a dispersion, a dental composite producible by curing such a dispersion, and uses of the dispersion as a precursor for dental composites.

Description

technical field [0001] The present invention relates to SiO 2 A dispersion of nanoparticle mixed oxides with at least one further metal oxide in a matrix monomer, relating to a dental composite obtainable using said dispersion as a precursor and by curing said dispersion, and It relates to the use of the dispersion according to the invention as a precursor for dental composites. The invention also relates to a process for the preparation of such dispersions. Background technique [0002] Dental composites are composite materials comprising a polymeric organic phase, in particular a resin matrix, and a filler material, preferably inorganic particles are used as filler material. Dispersions of filler materials in monomers are used as precursors for such dental composites. The precursor is provided in liquid or slurry form, ie the filler particles are incorporated into a liquid organic phase. The liquid organic phase contains monomers that can be converted into a resin matr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K6/083A61K6/027A61K6/884A61K6/896
CPCA61K6/77A61K6/17A61K6/887
Inventor 约尔格·舒马赫尔约亨·赫尔曼汉斯-约阿希姆·施米特巴斯蒂安·舍恩延斯·舒夫纳
Owner SCHOTT AG
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