A microcrystalline glass and microcrystalline glass product with excellent mechanical properties, microcrystalline glass product, the components of which, expressed in weight percent, contain: SiO.sub.2: 65˜80%; Al.sub.2O.sub.3: below 5%; Li.sub.2O: 10˜25%; ZrO.sub.2: 5˜15%; P.sub.2O.sub.5: 1˜8%. Through the reasonable component design, the microcrystalline glass product has excellent mechanical properties.

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools.

Embodiments of the present invention pertain to glass compositions, glasses and articles. The articles include an aluminosilicate glass, which may include P.sub.2O.sub.5 and K.sub.2O.

A glass ceramic that contains a glass containing Si, B, Al, and Zn and aggregates. The glass has a SiO.sub.2 content of 20% by weight to 55% by weight, a B.sub.2O.sub.3 content of 15% by weight to 30% by weight, Al.sub.2O.sub.3, and ZnO, wherein a weight ratio of the SiO.sub.2 to the B.sub.2O.sub.3 (SiO.sub.2/B.sub.2O.sub.3) is 1.21 or higher, and a weight ratio of the Al.sub.2O.sub.3 to the ZnO (Al.sub.2O.sub.3/ZnO) is 0.8 to 1.3. A TiO.sub.2 content, a ZrO.sub.2 content, a SnO.sub.2 content, and a Sr0 content in the glass each are 0% by weight to 5% by weight. The aggregates include 20% by weight to 50% by weight of SiO.sub.2, 1% by weight to 10% by weight of TiO.sub.2, 3% by weight or less of ZrO.sub.2, and 1% by weight or less of ZnO each relative to the weight of the glass ceramic.

Articles include a glass, including leachable plurality of Cu.sup.1+ ions, a degradable phase, and a cuprite phase disposed within the degradable phase. The cuprite phase is disposed within the degradable phase. In aspects, the degradable phase can include B.sub.2O.sub.3, P.sub.2O.sub.5, and K.sub.2O, and a durable phase can include SiO.sub.2. In aspects, the glass can have a plurality of Cu.sup.1+ ions disposed on the surface of the glass and in the glass network and/or the glass matrix. The article may also include a polymer. The glasses and articles disclosed herein exhibit a 2 log reduction or greater in a concentration of at least one of Staphylococcus aureus, Enterobacter aerogenes, Pseudomonas aeruginosa bacteria, Methicillin Resistant Staphylococcus aureus, and E. coli, under the EPA Test Method for Efficacy of Copper Alloy as a Sanitizer testing condition and under Modified JIS Z 2801 for Bacteria testing conditions.

A bioactive glass-ceramic composition as defined herein. Also disclosed are methods of making and using the disclosed compositions.

To provide an inorganic composition article containing at least one kind selected from α-cristobalite and α-cristobalite solid solution as a main crystal phase, in which by mass % in terms of oxide, a content of a SiO.sub.2 component is 50.0% to 75.0%, a content of a Li.sub.2O component is 3.0% to 10.0%, a content of an Al.sub.2O.sub.3 component is 5.0% or more and less than 15.0%, and a total content of the Al.sub.2O.sub.3 component and a ZrO.sub.2 component is 10.0% or more, and a surface compressive stress value is 600 MPa or more.

The present invention discloses a microcrystalline glass, a microcrystalline glass product, and a manufacturing method therefor. The main crystal phase of the microcrystalline glass comprises lithium silicate and a quartz crystal phase. The haze of the microcrystalline glass of the thickness of 0.55 mm is below 0.6%. The microcrystalline glass comprises the following components in percentage by weight: SiO.sub.2: 65-85%; Al.sub.2O.sub.3: 1-15%; Li.sub.2O: 5-15%; ZrO.sub.2: 0.1-10%; P.sub.2O.sub.5: 0.1-10%; K.sub.2O: 0-10%; MgO: 0-10%; ZnO: 0-10%. A four-point bending strength of the microcrystalline glass product is more than 600 Mpa.

The present invention is a glass ceramic including a crystal and a residual glass, in which the residual glass has a Young's modulus parameter ER of 75 or more, the Young's modulus parameter ER being calculated based on the following formula: ER=62.2×[SiO.sub.2]+134.9×[Al.sub.2O.sub.3]+121.7×[B.sub.2O.sub.3]+33.0×[P.sub.2O.sub.5]+72.6×[MgO]+121.5×[CaO]+43.7×[SrO]+38.6×[BaO]+84.0×[Li.sub.2O]+26.2×[Na.sub.2O]+17.8×[K.sub.2O]+156.8×[ZrO.sub.2]+154.3×[TiO.sub.2]+74.7×[La.sub.2O.sub.3]+80.3×[Y.sub.2O.sub.3]+54.3×[ZnO].

Embodiments of a transparent glass-based material comprising a glass phase and a second phase that is different from and is dispersed in the glass phase are provided. The second phase may comprise a crystalline or a nanocrystalline phase, a fiber, and/or glass particles. In some embodiments, the second phase is crystalline. In one or more embodiments, the glass-based material has a transmittance of at least about 88% over a visible spectrum ranging from about 400 nm to about 700 nm and a fracture toughness of at least about 0.9 MPa.Math.m.sup.½, and wherein a surface of the glass-based material, when scratched with a Knoop diamond at a load of at least 5 N to form a scratch having a width w, is free of chips having a size of greater than 3w.