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Lithium disilicate glass ceramic used for dental zirconia veneering porcelain and preparation method and application thereof

A glass-ceramic and lithium disilicate technology, which is applied in the field of dental restorations, can solve the problems of short service life, easy cracking, and formation of pores of zirconia all-ceramic restorations, and achieves prolonged clinical service life, high density, The effect of reducing defects such as internal pores

Inactive Publication Date: 2018-11-06
FOURTH MILITARY MEDICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the object of the present invention is to provide a lithium disilicate glass-ceramic used for dental zirconia surface decoration porcelain and its preparation method and application method. The present invention is used for dental zirconia surface decoration Lithium disilicate glass-ceramics of ceramics mainly use the high strength of lithium disilicate glass-ceramics and the application of hot-pressed casting decorative porcelain technology to solve the problem of low strength of the existing zirconia decorative porcelain materials, which are prone to cracking, and the current powder The short service life of zirconia all-ceramic restorations is caused by the formation of pores and other internal defects in the pulp-pile plastic-decorated porcelain process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A lithium disilicate glass-ceramic for dental zirconia veneer, comprising raw materials in the following mass ratio: 56.1% SiO 2 , 29% Li 2 CO 3 , 3.8% K 2 CO 3 , 2.7% Al 2 o 3 , 2.3% ZrO 2 , 2.5% P 2 o 5 , 2.6% B 2 o 3 , 0.5% TiO 2 and 0.5% CeO 2 .

[0026] The above-mentioned preparation method for the lithium disilicate glass-ceramic for dental zirconia surface decoration porcelain, comprises the following steps:

[0027] Step 1. Preparation of glass body: Pour all the raw materials into a ball milling tank according to the mass ratio of the above raw materials, add anhydrous ethanol twice the mass of the raw materials, use agate balls as the ball milling medium, the ball to material ratio is 2:1, and mill for 2 hours. After the raw materials were mixed evenly, they were placed in an oven, and dried at 80°C for 2 hours to obtain a mixed powder. Pour the mixed powder into a quartz crucible, put the quartz crucible into a program-controlled resistance fur...

Embodiment 2

[0031] A lithium disilicate glass-ceramic for dental zirconia veneer, comprising raw materials in the following mass ratio: 56.5% SiO 2 , 27.2% Li 2 CO 3 , 3.8% K 2 CO 3 , 2.7% Al 2 o 3 , 2.4% ZrO 2 , 2.6% P 2 o 5 , 3.8% B 2 o 3, 0.5% TiO 2 and 0.5% CeO 2 .

[0032] The above-mentioned preparation method for the lithium disilicate glass-ceramic for dental zirconia surface decoration porcelain, comprises the following steps:

[0033] Step 1. Preparation of glass body: Pour all the raw materials into a ball milling tank according to the mass ratio of the above raw materials, add anhydrous ethanol twice the mass of the raw materials, use zirconia balls as the ball milling medium, the ball to material ratio is 2:1, and mill for 2 hours , and the raw materials were mixed evenly, put into an oven, and dried at 80° C. for 2 hours. Pour the dried powder into a quartz crucible, put the quartz crucible into a program-controlled resistance furnace, heat up to 1500°C at a ra...

Embodiment 3

[0037] A lithium disilicate glass-ceramic for dental zirconia veneer, comprising raw materials in the following mass ratio: 57.8% SiO 2 , 27.5% Li 2 CO 3 , 3.7% K 2 CO 3 , 2.8% Al 2 o 3 , 2.4% ZrO 2 , 2.6% P 2 o 5 , 2.2% B 2 o 3 , 0.5% TiO 2 and 0.5% CeO 2 .

[0038] The above-mentioned preparation method for the lithium disilicate glass-ceramic for dental zirconia surface decoration porcelain, comprises the following steps:

[0039] Step 1. Preparation of glass body: Pour all the raw materials into a ball milling tank according to the mass ratio of the above raw materials, add anhydrous ethanol twice the mass of the raw materials, use zirconia balls as the ball milling medium, the ball to material ratio is 2:1, and mill for 2 hours , and the raw materials were mixed evenly, put into an oven, and dried at 80° C. for 2 hours. Pour the dried powder into a quartz crucible, put the quartz crucible into a program-controlled resistance furnace, heat up to 1500°C at a r...

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Abstract

The invention discloses a lithium disilicate glass ceramic used for dental zirconia veneering porcelain and a preparation method and application thereof, the lithium disilicate glass ceramic comprises56%-58% of SiO2, 27%-29% of Li2CO3, 3.7%-3.8% of K2CO3, 2.7%-2.8% of Al2O3, 2.3%-2.4% of ZrO2, 2.5%-2.6% of P2O5, 2.2%-3.8% of B2O3, 0.5% of Ti2O and 0.5% of CeO2. The preparation method comprises the steps that after raw material ball-milling and mixing, melting is performed, a melt is obtained, the melt is poured into a mold, then annealing is performed, and a glass blank is obtained; the glassblank is subjected to crystallization heat treatment, and the lithium disilicate glass ceramic is obtained. The obtained lithium disilicate glass ceramic is high in flexural strength, and the damageprobability of a restoration body due to veneering porcelain cracking can be remarkably reduced. The invention provides a method applying the lithium disilicate glass ceramic as zirconia veneering porcelain, in the restoration body obtained with the method, the bonding strength of the lithium disilicate glass ceramic veneering porcelain with a zirconia substrate is far higher than that of traditional zirconia decoration ceramic porcelain with the zirconia substrate, and the cracking resistance of a zirconia all-ceramic restoration body can be improved remarkably and the service life can be prolonged.

Description

technical field [0001] The invention relates to the field of dental restorations, in particular to a lithium disilicate glass ceramic used for dental zirconia surface decoration and its preparation method and application. Background technique [0002] The visual effect of dental restorations plays a decisive role in achieving the degree of realism. The translucency and color of the material have an extremely important influence on the appearance of the restoration. This puts forward new requirements for the performance of all-ceramic restoration materials, that is, the restoration materials must have high mechanical strength to withstand the occlusal force without fragmentation; on the other hand, they must have excellent optical properties and be able to simulate and reproduce the optical characteristics of natural tooth hard tissue. Zirconia all-ceramic materials have gradually become the main choice of dental restoration materials due to their excellent mechanical prope...

Claims

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Application Information

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IPC IPC(8): C03C10/04C03B32/02C04B41/85
CPCC03B32/02C03C10/0009C04B41/009C04B41/5023C04B41/85C04B35/48C04B41/0072
Inventor 王富余涛陈吉华
Owner FOURTH MILITARY MEDICAL UNIVERSITY
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