X-ray opaque barium-free glass and the use thereof

A glass and ray technology, applied in dental preparations, dental prostheses, molded cups, etc., can solve the problems of environmental health hazards, inability to achieve resistance, low weathering resistance, etc., and achieve the effect of meeting aesthetic requirements

Active Publication Date: 2010-08-18
SCHOTT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This CS 2 O content and X-ray opacifiers such as BaO, SrO, PbO, which may only be present in amounts of 0 to 1 mol %, mean that high X-ray opacity cannot be achieved in such glass systems
6-18mol% K 2 The O content also means that very good resistance cannot be achieved
[0029] A common feature of the glasses mentioned in the prior art is that they either have low weathering resistance and / or are not X-ray-opaque, and moreover are often difficult or expensive to produce, or contain environmental and / or ingredients harmful to health

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0073] Table 1 contains six exemplary embodiments within preferred compositional ranges. All details relating to composition are in wt%.

[0074] The glasses described in the examples were produced as follows:

[0075] Weigh out the oxide raw material without refining agent and mix thoroughly. The glass batch is melted at about 1580° C. in a batch melting unit, then refined and homogenized. The glass can be cast at a temperature of about 1640°C into ribbons or other desired shapes and processed. In a large volume, continuous setup, the temperature can be lowered by at least about 100K.

[0076] For further processing, the cooled glass strip is crushed by means of the process known from DE 41 00 604 C1 to form a glass powder with an average particle size of at most 10 μm. The glass properties were determined on the basis of glass clots which had not yet been pulverized. All glasses have excellent chemical resistance to acids, alkalis and water; moreover, they are as chemic...

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Abstract

Zirconium-containing BaO- and PbO-free X-ray opaque glasses having a refractive index nd of about 1.480 to about 1.517 and a high X-ray opacity with an aluminum equivalent thickness of at least about 180% are provided. Such glasses are based on a SiO2-B2O3-Cs2O-K2O-La2O3 system with additions of Al2O3, Li2O, Na2O and / or ZrO2. Such glasses may be used, in particular, as dental glasses or as optical glasses.

Description

technical field [0001] This invention relates to barium-free, lead-free, X-ray opaque glasses and uses thereof. Background technique [0002] Plastic dental compositions are increasingly being used in the field of dentistry for tooth restoration. These plastic dental compositions generally contain an organic resin matrix and various inorganic fillers. Inorganic fillers mainly include glass, (glass) ceramics, quartz or other crystalline substances (such as YbF 3 ), sol-gel materials or fumed silica, which are added to the plastic composition as filler material. [0003] Plastic dental compositions are used in order to avoid possible harmful side effects of amalgam and to obtain an improved aesthetic impression. Depending on the plastic dental composition chosen, they can be used in different dental restoration procedures, for example for tooth fillings, but also for fixed components such as crowns, bridges and inlays, onlays and the like. [0004] The filler material itse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/095C03C12/00A61K6/027A61K6/08A61K6/884A61K6/891
CPCA61K6/0276C03C8/02A61K6/0073C03C4/087A61K6/024A61K6/025C03C3/095C03C4/0021A61K6/71A61K6/822A61K6/836A61K6/818A61K6/887C08L33/14C08L33/068C08L35/04A61K6/80
Inventor 西蒙·莫尼卡·里特尔奥利弗·霍赫赖因赛宾·皮希勒-威廉
Owner SCHOTT AG
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