Abstract: The present invention is concerned with a process for the formation of dental restorations from glass-ceramic materials and the resulting dental restorations. A dental restoration is formed by pressing a lithium discilicate glass ceramic where the concentration of lithium discilicate crystals in the glass ceramic composition is at least 30% by weight. Crystal formation is effected with P2O5. The glass ceramic material may further contain coloring oxides, fluoresing agents, pigments, opacifiers and glass modifiers. The resulting dental restorations have superior optical, esthetic and strength properties.

Abstract: The present invention is concerned with a process for the formation of dental restorations from glass-ceramic materials and the resulting dental restorations. A dental restoration is formed by pressing a lithium discilicate glass ceramic where the concentration of lithium discilicate crystals in the glass ceramic composition is at least 30% by weight. Crystal formation is effected with P2O5. The glass ceramic material may further contain coloring oxides, fluoresing agents, pigments, opacifiers and glass modifiers. The resulting dental restorations have superior optical, esthetic and strength properties.

Abstract: The present invention is concerned with a process for the formation of dental restorations from glass-ceramic materials and the resulting dental restorations. A dental restoration is prepared by placing a glass-ceramic material in a heat-pressure deformable crucible. Heat is applied to the crucible to bring the glass-ceramic to a working range at temperatures above its liquidus temperature. The crucible has heat-pressure deformation properties which are matched to the working temperature of the glass-ceramic. Once the glass-ceramic is heated to its working temperature, the crucible is brought into contract with a mold having a cavity therein. As the distance between the heated crucible and the mold is decreased, the crucible is deformed to form a seal with the mold facilitating the injection of the molten glass-ceramic into the cavity. The resulting dental restoration has superior optical, esthetic and strength properties.

Abstract: This invention deals with dental abstract restorations which are formed from glass-ceramic materials. In this invention the dental restorations may be formed by pressing. The resulting dental restorations have superior optical esthetic and strength properties. The invention includes dental restorations which are formed from particular lithium-disilicate glass-ceramics. In addition to forming dental restorations by pressing, the dental restorations may be milled. After forming the dental restorations are altered by applying one or more layers of a porcelain material to said dental restorations, and fusing said layers.

Abstract: The present invention is concerned with a process for the formation of dental restorations from glass-ceramic materials and the resulting dental restorations. In this invention, a dental restoration is prepared by placing a glass-ceramic material in a heat-pressure deformable crucible. Heat is then applied to the crucible in order to bring the glass-ceramic material to a working range at temperatures above its liquidus temperature. The crucible in which the glass-ceramic material is placed has heat-pressure deformation properties which are matched to the working temperature of the glass-ceramic materials being heated. The heat deformation properties of the crucible must be such that when the glass-ceramic material in the crucible is in the working range the crucible is heat-pressure deformable without rupturing.

Abstract: The present is invention is concerned with a heat deformable crucible used for the preparation of glass-ceramic materials and the resulting dental restorations. The crucible has a base and a side portion and is formed from the sintering of silica with a particulate mixture of borosilicate glass having a composition in weight percent of 78% SiO2, 15% B2O3, 2.5% Al2O3 and 4.5% Na2O3.

Abstract: The present invention is concerned with a process for the formation of dental restorations from glass-ceramic materials and the resulting dental restorations. A dental restoration is prepared by placing a glass-ceramic material in a heat-pressure deformable crucible. Heat is applied to the crucible to bring the glass-ceramic to a working range at temperatures above its liquidus temperature. The crucible has heat-pressure deformation properties which are matched to the working temperature of the glass-ceramic. Once the glass-ceramic is heated to its working temperature, the crucible is brought into contract with a mold having a cavity therein. As the distance between the heated crucible and the mold is decreased, the crucible is deformed to form a seal with the mold facilitating the injection of the molten glass-ceramic into the cavity. The resulting dental restoration has superior optical, esthetic and strength properties.

Abstract: The present invention is concerned with a process for the formation of dental restorations from glass-ceramic materials and the resulting dental restorations. In this invention, a dental restoration is prepared by placing a glass-ceramic material in a heat-pressure deformable crucible. Heat is then applied to the crucible in order to bring the glass-ceramic material to a working range at temperatures above its liquidus temperature. The crucible in which the glass-ceramic material is placed has heat-pressure deformation properties which are matched to the working temperature of the glass-ceramic material being heated. The heat deformation properties of the crucible must be such that when the glass-ceramic material in the crucible is in the working range the crucible is heat-pressure deformable without rupturing.

Abstract: The present invention is concerned with a process for the formation of dental restorations from glass-ceramic materials and the resulting dental restorations. In this invention, a dental restoration is prepared by placing a glass-ceramic material in a heat-pressure deformable crucible. Heat is then applied to the crucible in order to bring the glass-ceramic material to a working range at temperatures above its liquidus temperature. The crucible in which the glass-ceramic material is placed has heat-pressure deformation properties which are matched to the working temperature of the glass-ceramic material being heated. The heat deformation properties of the crucible must be such that when the glass-ceramic material in the crucible is in the working range the crucible is heat-pressure deformable without rupturing.

Abstract: A process for the formation of dental restorations from glass-ceramic materials and the resulting dental restorations. In this invention, a dental restoration is prepared by placing a glass-ceramic material in a heat-pressure deformable crucible. Heat is then applied to the crucible in order to bring the glass-ceramic material to a working range at temperatures above its liquidus temperature. The crucible in which the glass-ceramic material is placed has heat-pressure deformation properties which are matched to the working temperature of the glass-ceramic material being heated. The heat deformation properties of the crucible must be such that when the glass-ceramic material in the crucible is in the working range the crucible is heat-pressure deformable without rupturing. Once the glass-ceramic material is heated to its working temperature, the crucible is brought into contact with a mold having a preformed cavity therein, the cavity being in the shape of the desired dental restoration.

Abstract: An orthodontic bracket made of a partially crystallized amorphous glass material and method for making same. The orthodontic bracket has a thin compressive outer crystalline layer.

Abstract: An orthodontic bracket made of a partially crystallized glass material and method for making same. The orthodontic bracket has a thin compressive outer crystalline layer.

Abstract: An orthodontic bracket made of a partially crystallized glass material and method for making same. The orthodontic bracket has a thin compressive outer crystalline layer.