A kind of glass, its preparation method and application

Abstract

The invention relates to glass, and a preparation method and application thereof to the field of dental restoration materials. The glass of the invention comprises, in percent by weight, 50%-80% of SiO2, 5%-20% of Li2O, 0.5%-5% of K2O, 1%-9% of Al2O3, 1%-7% of P2O5 and 7%-20% of B2O3. A glass body prepared according to the above glass compositions through a casting method does not generate phenomena of phase separation and crystallization. The glass of the invention is subjected to first thermal treatment, single-crystal-phase lithium silicate is precipitated, the processed glass has a strength of 100 MPa-180 MPa and has extremely good machinability; and secondary thermal treatment is carried out, thus lithium disilicate microcrystalline glass with a single crystal phase is obtained, has a strength of 360 MPa-450 MPa and meets clinic requirements. Meanwhile, the lithium disilicate microcrystalline glass obtained in the invention has extremely good light transmittance, and has a light transmittance of about 30%-40% at a wavelength of 480 nm.

Description

technical field [0001] The invention belongs to the field of biological materials, and relates to a glass, its preparation method and application, in particular to a glass, its preparation method and its application in preparing machinable glass-ceramics or castable glass-ceramics. 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 step-by-step precipitation of different crystal phases through a special heat treatment system, and then obtain glass-ceramics with different mechanical properties. Therefore, it has been extensively studied by scholars. 2 O-SiO 2 The glass system is successfully used in the field of dental restorations, and its representative product is lithium disilicate glass-ceramics. [0003] According to literature re...

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Problems solved by technology

[0009] US2015104655A1 discloses a lithium disilicate glass-ceramic placed on the surface of a zirconia substrate, which can be made into a dental restorative material. The glass-ceramic component includes 10-15wt% Li 2 O, 71.1~85wt% SiO 2 , 2~5wt%P 2 o 5 , 1~5wt%Al 2 o 3 And 0.01 ~ 1wt% ZrO 2 , the glass-ceramics component may also include 0.1 to 6.5 wt% B 2 o 3 , 0.1~7wt%K 2 O and / or Na 2 O and 0.001 to 3wt% MgO, however, in the preparation process, there is no guarantee that only one crystal phase will be precipitated in each heat treatment step, whether it is the lithium silicate crystal phase precipitated in the first step or the disilicate crystal phase precipitated in the second step Lithium crystal phase, not the only crystal phase

Since the strength of lithium silicate glass-ceramics (about 140Mpa) is much lower than that of lithium disilicate glass-ceramics (400MPa), the lithium-silicate glass-ceramics prepared according to US2015104655A1 will be difficult to cut due to high strength , and the prepared lithium disilicate glass-ceramics will fail to meet the clinical requirements for mechanical strength due to its low strength.

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