Ultrasonic curing of dental filling materials

A filling material, a technology for teeth, applied in the field of zirconia particle group and preparation of such zirconia particles, controlling the volume shrinkage rate of composite materials during curing, composite materials in the form of dental filling materials, repairing teeth, ultrasonic curing of dental filling materials , which can solve the problems of implant failure, mechanical performance degradation, unsuitable size, etc.

Inactive Publication Date: 2007-04-18
APROXI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This can also cause mechanical degradation and implant failure
In the world of imprinted materials, shrinkage can cause problems that can lead to dimensional misfits

Method used

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  • Ultrasonic curing of dental filling materials

Examples

Experimental program
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Effect test

example

[0093] Example: Treatment of tetragonal zirconia crystals with ethanol in an ultrasonic bath (400 kHz) produces a phase transition. The dispersion of zirconia particles in the resin base can be phase inverted by ultrasound using a scale remover, a device used by dentists to remove tartar.

[0094] In another embodiment, the Martin transition of the filler component is induced by exposing the surface of the filler component to a chemical initiator.

[0095] For phase transitions of systems where the first phase is metastable, but where the activation energy barrier is high (because the surface energy of the first phase is low), the activation energy barrier can be lowered by surface modification. Activation of the phase transition can be induced by surface modification. The activation energy barrier may be the energy barrier required to perform a surface modification that makes the surface energy of the phase higher (or makes it more similar to the surface of the second phase)...

Embodiment approach

[0157] In order to obtain zirconia particles that can undergo rapid phase transformation, a large surface area, such as 10-250m 2 / g, or even better 50-200m 2 / g, are preferred and can also be obtained in the manner described here.

[0158] Accordingly, a further aspect of the invention relates to an average particle size of 50-2000 nm and a BET surface area of ​​10-250 m 2 / g of zirconia particles that exist as a metastable first phase and are capable of undergoing a Martin transition to a stable second phase.

[0159] Preferably, the population of zirconia particles undergoes Martin transformation to an extent of at least 80% within 300 seconds when tested according to the "Zirconia Particle Transformation Test" defined herein.

[0160] As mentioned above, the average particle size is typically 50-2000 nm, for example 50-1000 nm, especially 100-600 nm.

[0161] Although the particle size of zirconia particles is typically 50-2000 nm, it is believed that the particles comp...

Embodiment 1- 4

[0225] Example 1 - Tetragonal nano-sized zirconia

[0226] The preparation of tetragonal nanosized zirconia (ZrO 2 )Methods. by ZrOCl 2 ·8H 2 O and pure water to prepare 0.5M ZrOCl 2 solution. At a constant pH of 10, with 1.5M NH 3 Precipitated amorphous zirconia ZrO x (OH) 4-2x . The mixture was kept under magnetic stirring for 10 days. The precipitate was then washed with pure water, and the filter cake was heated to 120°C overnight. The filter cake was then crushed into a fine white powder and placed in an oven at 450°C with a dry atmosphere.

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Abstract

The present invention relates to a composite material exhibiting a low or even negligible volumetric shrinkage upon curing, or even a small expansion (e.g. up to 0.5%), in particular composite materials in the form of dental filling materials. The present invention also relates to a method of controlling volumetric shrinkage of a composite material upon curing, and to a method of reconstructing a tooth. The present invention also relates to ultrasonic curing of dental filling materials. The present invention further relates to a population of zirconia particles and methods for preparing such zirconia particles (e.g. zirconia in the tetragonal phase or zirconia in the cubic phase). The martensitic transformation of the filler ingredients is, e.g., triggered by application of ultrasound or by a chemical trigger.

Description

field of invention [0001] The present invention relates to composite materials, especially in the form of dental filling materials, which exhibit low or even negligible volumetric shrinkage, or even small expansion (eg, up to 0.5%) on curing. The invention also relates to methods of controlling volume shrinkage of composite materials upon curing, and methods of restoring teeth. The invention also relates to ultrasonically curing dental filling materials. The invention further relates to populations of zirconia particles and methods of making such zirconia particles. Background of the invention [0002] Generally, shrinkage occurs when a polymerizable resin base material (eg, monomer or monomer mixture) polymerizes. As pointed out, for example, by William J. Bailey et al. in "Ring-Opening Polymerization with Expansion in Volume", ACS Symposium 59, No. 4, p. 38-59 (1977), the gel point in crosslinked materials Later, or in linear thermoplastics, when the monomer-polymer mix...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K6/08A61K6/027A61K6/083A61K6/884A61K6/891A61K6/893
CPCA61K6/09A61K6/0073A61K6/083A61K6/0002A61K6/15A61K6/71A61K6/893C08L75/16A61K6/887C08L33/10
Inventor A·范勒里维尔德K·阿姆达尔S·林德洛斯B·F·索伦森
Owner APROXI
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