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

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...

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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 place, the result is: the light transmittance of the lithium disilicate glass-ceramic at the 550nm wavelength place with a thickness of 0.8mm is less than 10%, and the prior art has not disclosed how to adjust the lithium disilicate glass ceramics. Study on Transmittance of Crystal Glass

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