The invention discloses a biologically active zirconia denture has a gradient structure, the gradient structure consisting of a biomimetic nano-gradient biologically active outer surface layer, the nano-gradient outer surface layer is composed of zirconia nanocrystals and a plurality of nanopores penetrating gradiently through the layer, a micron-gradient biocompatible inner layer, the micron-gradient inner surface layer is composed of zirconia microncrystals and a plurality of micronpores penetrating gradiently through the layer, a dense micron-gradient biocompatible matrix structure, a uniform gradient transition is formed at the interface between the nano-gradient outer layer and the micron-gradient inner layer, and the micron-gradient inner layer and the matrix. The invention has the advantages of high strength, high toughness, low friction coefficient, low abrasion to the teeth, good biocompatibility and biological activity.

To provide a technology for sintering calcium phosphate to manufacture a calcium phosphate sintered body and suppressing generation of calcium oxide when calcium phosphate is sintered, there is provided a process for manufacturing a sintered calcium phosphate molded body is characterized by including a step for heating a composition containing at least a composite of calcium phosphate fine particles and polyether and sintering the calcium phosphate fine particles.

The present invention provides a gypsum-based embedding material composition for casting useful for forming a rapid-heating type gypsum-based embedding material and a method for producing the same. The gypsum-based embedding material is formed of the gypsum-based powdery embedding material composition by adding a malaxation liquid into the composition and heating the mixture in a high-temperature furnace. The gypsum-based embedding material composition contains as main components, at least one co-pulverized material selected from a co-pulverized material of calcined gypsum and quartz, that of calcined gypsum and cristobalite, and that of calcined gypsum, quartz, and cristobalite. The composition further contains a powdery moisture-retaining component or a liquid moisture-retaining component having a low water content, and has an average particle diameter of 30 μm or less.

A ceramic body is provided that is suitable for use in dental applications to provide a natural aesthetic appearance. A colorized ceramic body is formed that has at least one color region and a color gradient region. A ceramic body is formed having at least two color regions and a color gradient that forms a transition region between two color regions. A method for making the colorized ceramic body includes unidirectional infiltration of a coloring composition into the ceramic body.

The invention relates to the use of ceramic parts that at least partly consist of a ceramic foam in the field of medical technology.

The invention relates to a method for producing a multi-purpose isotropic hydroxylapatite/gelatine composite material, involving at least the following steps: a) providing a suspension of powdered hydroxylapatite in a liquid medium selected from the group comprising a C1-C10 alcohol, particularly ethanol, another dispersing agent that can be mixed with water, water, and mixtures thereof; b) adding an aqueous solution of gelatine, preferably at a concentration of 5 to 25 wt. % gelatine, to the suspension; c) agitating the mixture at a predefined temperature for a predefined period of time, preferably in the region of 1 to 10 hours, until the liquid medium has been fully or partially evaporated; and d) optionally drying the product obtained in step c). In a specific embodiment, the method is characterised in that the product obtained in step c) or d) is additionally infiltrated with at least one aliphatic polyether in an additional step e1). In another specific embodiment, the method is characterised in that the product obtained in step c), d) or e1) is additionally brought into contact with at least one agent for crosslinking the gelatine chains, in step e2). A further aspect of the invention relates to the composite material produced using the method described above, and the use of same, particularly as artificial ivory.

An embodiment according to the present invention provides a dental gypsum powder including a hemihydrate gypsum and a water-reducing agent, wherein the mass ratio of the water-reducing agent to the hemihydrate gypsum is 0.1 to 1%, the content of particles having a particle diameter of 10 m or less is 15 to 35 volume %, the content of particles having a particle diameter of 20 m or less is 40 to 55 volume %, and the content of particles having a particle diameter of 30 m or less is 55 to 75 volume %.

A method of making porous ceramic granules is provided. The method comprises heating pore-forming agent particles to a temperature above a glass transition temperature for the pore-forming agent particles; contacting the heated pore-forming agent particles with a ceramic material to form a mixture of pore-forming agent particles and ceramic material; heating the mixture to remove the pore-forming agent particles from the mixture to form a porous ceramic material; and micronizing the porous ceramic material to obtain the porous ceramic granules, wherein the porous ceramic granules have an average diameter from about 50 m to 800 m. The porous ceramic granules are also disclosed.

An object of the present disclosure is to provide a dental composition that can exhibit sufficient curability even in a state where moisture is excessive as in the oral environment. The dental composition of the present disclosure contains component (a): monomer containing (meth)acrylamide group represented by formula (1):

##STR00001##

(In formula, R represents a hydrogen atom or a methyl group and Rs may be the same or different from each other. R2 is an alkyl group having 2 to 6 carbon atoms and R2s may be the same or different from each other.)

The invention relates to a process for producing a glazed ceramic body, in which (a) a glazing material is applied to a non-densely sintered substrate material and (b) the substrate material and the glazing material are subjected to a heat treatment in a temperature range which extends from a first temperature T.sub.1 to a second temperature T.sub.2, which is higher than the first temperature, in order to obtain the glazed body.

The invention also relates to the use of a glazing material for glazing a non-densely sintered substrate material.