X-ray opaque glass

A glass and ray technology, applied in dental preparations, dental prostheses, filling teeth, etc., can solve the problems of low refractive index, low weather resistance, high X-ray opacity, etc., and achieve the effect of meeting aesthetic requirements

Inactive Publication Date: 2013-04-17
SCHOTT AG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

MgO does not increase X-ray opacity to the same extent as other alkaline earth metal oxides CaO, SrO and BaO, but its d known increase in , and can thus make it difficult to achieve the desired balance between low refractive index and high x-ray opacity
[0027] All glasses mentioned in the prior art either have low weather resistance, or are too reactive, and / or are not X-ray opaque, or contain components that are damaging to the environment and / or health

Method used

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Examples

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Embodiment Construction

[0081] The glasses described in the examples were prepared as follows:

[0082] The raw materials for oxides were weighed without fining agent and then mixed thoroughly. The glass mixture is melted at about 1580° C. in a discontinuous melting apparatus, then clarified and homogenized. At a casting temperature of about 1600°C, the glass can be cast and processed into ribbons or other desired dimensions. In large volume, continuous installations, the temperature can drop by at least about 100K.

[0083] For further processing, the cooled glass ribbon is ground to a glass powder with an average particle size of not more than 10 μm by means of the method known from DE4100604C1. Glass properties were determined on glass gobs that were not pulverized. All glasses exhibit excellent chemical resistance to acids, bases, water and fluorine-containing species such as NaF and NaF / acetic acid.

[0084] Table 1 also shows the refractive index n d , glass transition temperature T g and...

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Abstract

An X-ray-opaque glass is disclosed which is free of BaO and PbO except for at most impurities and has a refractive index nd of from 1.50 to 1.58 and a high X-ray opacity with an aluminium equivalent thickness of at least 300%. The glass is based on the system Si02 - Al203 - SrO - R20 with additions of La203 and Zr02. The glass has very good chemical resistance and can be used, in particular, as dental glass or as optical glass.

Description

technical field [0001] The present invention relates to barium-free, lead-free X-ray opaque glasses and uses thereof. Background technique [0002] In the field of dentistry, polymer-based dental compositions are increasingly being used for tooth restoration. These polymer-based dental compositions generally comprise an organic resin matrix and various inorganic fillers. The inorganic filler mainly comprises glass, (glass) ceramics, silica or other crystalline materials (such as YbF 3 ), sol-gel materials or aerosols and added as fillers to polymer-based compositions. [0003] The use of polymer-based dental compositions attempts to avoid potentially harmful side effects of amalgams and to achieve an improved aesthetic impression. Depending on the polymer-based dental composition chosen, it can be used in various dental restoration procedures, for example for tooth fillings and for fixed components such as crowns, bridges, inlays, onlays and the like. [0004] The filler...

Claims

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Application Information

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IPC IPC(8): C03C4/08C03C3/085A61C13/08A61K6/884
CPCA61C5/70A61C2201/005A61K6/77A61K6/889C03C3/095C03C4/0021C03C4/08A61K6/836C03C4/087
Inventor 西蒙·莫尼卡·里特尔赛宾·皮希勒-威廉卡瑞纳·多布勒斯蒂芬尼·汉森
Owner SCHOTT AG
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