Lithium silicate glass ceramic, preparation method thereof and obtained prosthesis

A technology of glass ceramics and lithium silicate, which is applied in the field of dental materials, can solve problems such as incomplete die-casting, easy cracks, excessively high softening temperature and die-casting temperature, and achieve lower softening temperature and die-casting temperature, softening temperature and die-casting temperature. Reduced temperature, avoiding the effect of incomplete die casting

Pending Publication Date: 2022-06-21
SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the softening temperature of lithium disilicate glass-ceramics is mostly above 600°C. The die-casting temperature of lithium disilicate glass-ceramic restorations prepared by die-casting method is mostly higher than 900°C. In the actual production process, the softening temperature is too high. Temperature and die-casting temperature are not conducive to saving energy consumption, increase production costs, and have high requirements on technology, which is not conducive to industrial production
When making lithium disilicate glass-ceramic restorations with complex shapes, excessive die-casting temperature is prone to incomplete die-casting, resulting in a decline in the qualified rate of the product
In addition, a common problem faced in the preparation process of lithium disilicate glass ceramics is that cracks are prone to occur, and the generation of cracks will reduce the yield of glass ceramics in the production process.

Method used

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  • Lithium silicate glass ceramic, preparation method thereof and obtained prosthesis
  • Lithium silicate glass ceramic, preparation method thereof and obtained prosthesis
  • Lithium silicate glass ceramic, preparation method thereof and obtained prosthesis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] According to formula 1 in Table 1, the components are fully mixed and put into a platinum crucible, and the platinum crucible is placed in a heating furnace. melted, then poured into cold water to obtain a frit. The frit was heated at 1550 °C for 150 min to melt, and then cast into a mold to form a porcelain block. The ceramic block is heat-treated in a box furnace, the heat-treatment temperature is 800° C., and the heat-treatment time is 1 h to obtain lithium disilicate glass ceramics. Then, the lithium disilicate glass-ceramic is made into a lithium disilicate glass-ceramic restoration by a die-casting method, and the die-casting temperature is 650°C.

Embodiment 2

[0031] According to the formula 2 in Table 1, the components are fully mixed and put into the platinum crucible, the platinum crucible is put into the heating furnace, the heating temperature is controlled to be 1350 ° C, and the heating time is 120 min, so that the components are melted and uniform. melted, then poured into cold water to obtain a frit. The frit was heated at 1350°C for 120 min to melt, and then cast into a mold to form a ceramic block. The ceramic block is heat-treated in a box furnace, the heat-treatment temperature is 700° C., and the heat-treatment time is 2 hours to obtain lithium disilicate glass ceramics. Then, the lithium disilicate glass-ceramic is made into a lithium disilicate glass-ceramic restoration by a die casting method, and the die casting temperature is 730°C.

Embodiment 3

[0033] According to the formula 3 in Table 1, the components are fully mixed and put into a platinum crucible, the platinum crucible is put into a heating furnace, the heating temperature is controlled to be 1350 ° C, and the heating time is 120 min. melted, then poured into cold water to obtain a frit. The frit was heated at 1350°C for 120 min to melt, and then cast into a mold to form a ceramic block. The ceramic block is heat-treated in a box furnace, the heat-treatment temperature is 700° C., and the heat-treatment time is 2 hours to obtain lithium disilicate glass ceramics. Then, the lithium disilicate glass-ceramic was made into a lithium disilicate glass-ceramic restoration by die casting method, and the die casting temperature was 690°C.

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Abstract

The invention provides lithium silicate glass ceramic, a preparation method thereof and an obtained prosthesis, and belongs to the technical field of dental materials. The lithium silicate glass ceramic provided by the invention is prepared from the following components in percentage by weight: 59wt%-97.9 wt% of a basic glass component, 22wt%-12wt% of hollow TiO2 and 0.1 wt%-6wt% of magnesium spinel. The magnesium spinel and the hollow titanium oxide are added into the lithium silicate glass ceramic provided by the invention, the generation and expansion of cracks in the preparation process can be effectively inhibited by utilizing the hollow structure of the hollow titanium oxide, and the reduction of the cracks plays an important role in improving the yield in the preparation process of the lithium silicate glass ceramic. Meanwhile, the magnesium spinel component is added into the original components, so that the softening temperature and the die-casting temperature of the lithium silicate glass ceramic can be effectively reduced, and the requirements of the dental restoration material on corresponding performance can be met.

Description

technical field [0001] The invention belongs to the technical field of dental materials, and in particular relates to a lithium silicate glass ceramic, a preparation method thereof and a restoration body obtained therefrom. Background technique [0002] Lithium disilicate (Li 2 Si 2 O 5 ) Glass ceramics have both the transparency of glass and the strength of ceramics, and are widely used in the field of dental restoration materials, especially in aesthetic restoration. For example, when doing minimally invasive restorations or ultra-thin veneers, compared with traditional zirconia materials, the unique texture and opalescence of lithium disilicate glass-ceramic materials are more suitable as materials for dental restorations. [0003] At present, the softening temperature of lithium disilicate glass-ceramics is mostly above 600°C, and the die-casting temperature of lithium disilicate glass-ceramic restorations prepared by die-casting method is mostly higher than 900°C. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/04A61C13/08A61C13/083A61K6/836C03B5/16C03B19/02C03B32/02
CPCC03C10/0009C03B19/02C03B32/02C03B5/16A61C13/081A61C13/083A61K6/836
Inventor 宋锡滨马海洋吕玉兴何玲玲奚洪亮张艳
Owner SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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