Fluorescent glass ceramics and glasses containing europium

A technology of glass ceramics and glass, which is applied in the field of preparing dental restorations, can solve problems such as damage to fluorescence properties, and achieve the effect of improving fluorescence properties, heat treatment and stable oxidation conditions

Pending Publication Date: 2020-08-21
IVOCLAR VIVADENT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, in the case of glasses and glass-ceramics produced in this way, a considerable impairment of the fluorescent properties is caused by heat treatment under oxidizing conditions, for example during sintering

Method used

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  • Fluorescent glass ceramics and glasses containing europium
  • Fluorescent glass ceramics and glasses containing europium
  • Fluorescent glass ceramics and glasses containing europium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0080] A total of 21 glasses according to the invention were produced with the compositions specified in Table I, where the oxidation states of the specified oxides are related to the oxidation states of the raw materials used. The glass crystallized to form glass-ceramics according to Table II. it's here

[0081] T g Indicates the glass transition temperature determined by DSC

[0082] T S and t S Indicates the temperature and time used for melting

[0083] T 烧结 and t 烧结 Indicates the temperature and time used for sintering.

[0084] Additionally, a glass or glass-ceramic according to Table III is mixed with another glass and sintered to form a glass-ceramic body.

[0085] A) Preparation of glasses according to the invention

[0086] In the examples, a starting glass with the composition specified in Table 1 is first heated at temperature T S The following melts from common raw materials on a scale of 100 to 200 g for a duration of t S. Glass frits are made by ...

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PUM

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Abstract

The invention relates to fluorescent glass ceramics and glasses containing europium containing the following components: and which are particularly suitable for the production of dental prostheses, the fluorescent properties of which are largely comparable to the fluorescent properties of natural teeth.

Description

technical field [0001] The invention relates to glass-ceramics and glasses which contain europium and which are particularly suitable for the manufacture of dental restorations, the fluorescence properties of which largely correspond to those of natural teeth. The invention also relates to methods for producing the glass ceramics and glasses according to the invention, and their use as dental materials, in particular for the production of dental restorations. Background technique [0002] Glass ceramics are used in dentistry, especially for the manufacture of crowns and small bridges, due to their good mechanical and optical properties. [0003] From W.Buchalla's "Comparative Fluorescence Spectroscopy Shows Differences in Non-Cavitated Enamel Lesions", Caries Res.2005, 39, 150-156, under ultraviolet light, Natural teeth exhibit blue-white fluorescence with wavelengths in the 400 to 650 nm range. [0004] Rukmani et al., J. Am. Ceram. Soc. 2007, 90, 706-711 describe the inf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/04C03C4/12C03C3/062C03C3/085C03C3/087C03C4/00A61K6/833
CPCC03C10/0036C03C4/12C03C3/062C03C3/085C03C3/087C03C4/0021C03C3/095C03C2201/36A61C13/082A61C13/083A61K6/822A61K6/836A61K6/833C03C10/0009C03C10/0045C03C10/0054C03B1/02C03B11/122C03C2205/06
Inventor M·迪特默R·亨斯特C·里茨伯格
Owner IVOCLAR VIVADENT AG
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