Lithium silicate microcrystalline glass and lithium disilicate microcrystalline glass with high permeability, and preparation method and application thereof

A technology of glass-ceramics and lithium disilicate, which is applied in the field of dental restoration materials and biological materials, can solve the problems of low light transmittance and undisclosed light transmittance of lithium disilicate glass-ceramics, etc.

Active Publication Date: 2018-05-25
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology

But the light transmittance of lithium disilicate glass-ceramics of prior art is still very low, the light transmittance of commercial lithium disilicate glass-ceramics in prior art is tested, adopt spectrophotometer to test sample at 380nm~ The light transmittance at the 780nm wavelength

Method used

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  • Lithium silicate microcrystalline glass and lithium disilicate microcrystalline glass with high permeability, and preparation method and application thereof
  • Lithium silicate microcrystalline glass and lithium disilicate microcrystalline glass with high permeability, and preparation method and application thereof
  • Lithium silicate microcrystalline glass and lithium disilicate microcrystalline glass with high permeability, and preparation method and application thereof

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Embodiment 1～5

[0069] Preparation of the basic glass block:

[0070] According to the percentage by weight of each component of the glass described in each embodiment listed in Table 1, take by weighing analytically pure SiO 2 , Li 2 CO 3 、K 2 CO 3 、Al 2 o 3 、TiO 2 and CeO 2 , after fully mixing and grinding with a planetary ball mill, take it out and dry it; put the powder obtained after drying in a platinum alloy crucible, put it in a box-type resistance furnace, and raise the temperature to 1200 ° C ~ 1600 ° C in an air atmosphere, and keep the temperature constant 1h to 5h, and then take it out at 1400°C and cast it into a basic glass block. The base glass block obtained by casting is about 30 grams.

[0071] Preparation of lithium silicate glass-ceramics containing nano-lithium silicate crystals:

[0072] After heat-treating the glass blocks obtained in each example at 500°C to 750°C for 5min to 60min, a single crystal phase of lithium silicate is precipitated to obtain lithiu...

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Abstract

The invention relates to a lithium silicate microcrystalline glass and a lithium disilicate microcrystalline glass with high permeability, and a preparation method and application thereof. The size oflithium silicate crystal in the lithium silicate microcrystalline glass is smaller than 50nm; the size of lithium disilicate crystal in the lithium disilicate microcrystalline glass is smaller than 200nm. The lithium silicate microcrystalline glass and the lithium disilicate microcrystalline glass have the advantages that the basic glass is prepared by the particular combination, a cooperation relationship among SiO2 (silicon dioxide), Li2O (lithium dioxide) and other components is controlled, and a ratio relationship between SiO2 and Li2O is especially controlled; after primary heat treatment, the lithium silicate microcrystalline glass with size smaller than 50nm is obtained; after the lithium silicate microcrystalline glass is subject to heat treatment again, the lithium disilicate microcrystalline glass is prepared, the crystal size of the lithium disilicate microcrystalline glass is controlled to be 200nm or less, the light permeability is 20% to 95% at the wavelength of 550nm, the strength is 360MPa to 450MPa, and the clinical requirement of the high permeability and excellent strength of the lithium disilicate microcrystalline glass can be met.

Description

technical field [0001] The invention belongs to the field of biomaterials, and relates to lithium silicate glass-ceramics, lithium disilicate glass-ceramics and their preparation methods and applications, in particular to lithium silicate glass-ceramics with high permeability and lithium disilicate glass with high permeability Glass-ceramic and its use in the field of dental restorative materials. Background technique [0002] Lithium disilicate (Li 2 Si 2 o 5 ) Glass-ceramic is made by Li 2 O-SiO 2 The glass system is obtained by controlled crystallization, and the main crystal phase precipitated is lithium disilicate crystal. Thanks to Li 2 O-SiO 2 The glass system can achieve overall crystallization through a special heat treatment system, and then obtain excellent mechanical properties, so it has been extensively studied by scholars. Ivoclar will Li 2 O-SiO 2 The glass system is successfully used in the field of dental restorations, and its representative produ...

Claims

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Application Information

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IPC IPC(8): C03C10/04C03C6/04C03B32/02A61K6/027
CPCA61K6/836C03B32/02C03C1/00C03C1/04C03C10/0027
Inventor 彭练白杨朱庆山
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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