An object of the present invention is to provide a two-paste type dental resin-reinforced glass ionomer cement composition which exhibit high surface curability even under wet conditions, which makes difficult for the surface to become cloudy even if moisture comes in contact with at the initial stage of curing, exhibits high mechanical properties, low water absorption expansion and excellent coloring resistance in the set product and is also excellent in storage stability. The two-paste type dental resin-reinforced glass ionomer cement composition of the present invention consists of two pastes, wherein at least one of the two pastes contains (a) acid-reactive glass powder, (b) polymer of acidic group-containing polymerizable monomer, (c) water, (d) hydroxyl group-containing (meth)acrylate-based polymerizable monomer, (e) tri or more functional (meth)acrylamide-based polymerizable monomer, and (f) polymerization initiator, wherein the paste containing the (c) water does not contain at least one of the (a) acid-reactive glass powder and the (b) polymer of acidic group-containing polymerizable monomer.

An object of the present invention is to provide a dental resin-reinforced glass ionomer cement composition which exhibit high surface curability even under wet conditions, which makes it difficult for the surface to become cloudy even if moisture comes in contact with at the initial stage of curing, exhibits high mechanical properties, low water absorption expansion and excellent coloring resistance in the set product and is also excellent in storage stability. The dental resin-reinforced glass ionomer cement composition consisting of a powder material and a liquid material, wherein the powder material contains (a) acid-reactive glass powder, the liquid material contains (b) water, (c) polymer of acidic group-containing polymerizable monomer, (d) hydroxyl group-containing (meth)acrylate-based polymerizable monomer and (e) tri or more functional (meth)acrylamide-based polymerizable monomer, and at least one of the powder material and the liquid material contains (f) polymerization initiator.

The invention relates to a process of producing a dental zirconia restoration, the dental zirconia restoration having an outer and an inner surface, the process comprising the step of firing a porous dental zirconia restoration and a glass until the porous dental zirconia restoration is sintered, the glass being located during the firing step on at least a portion of the outer surface of the porous dental zirconia restoration, wherein the zirconia material of the porous dental zirconia restoration and the glass are selected such that during the firing step the glass infiltrates the pores of the porous dental zirconia restoration to an extent of not more than 5 m in depth. The invention also relates to a sintered dental zirconia restoration obtainable by such a process and a kit of parts comprising a porous dental zirconia mill blank and a surface treating agent containing a glass for use in such a process.

A process for preparing a body having an osseointegrative topography formed on its surface. The process includes the steps of providing a primary body made of a titanium-zirconium alloy containing 13 to 17 wt-% of zirconium, sandblasting the primary body, and etching the sandblasted primary body with an etching solution including hydrochloric acid, sulfuric acid and water at a temperature of above 80 C. to obtain the body, said etching being performed for a duration of 350 seconds at least.

The invention relates to a dental ceramic blank, in particular a filled milling blank, comprising at least one organic Compound, such as a polymer polymerized in the blank, for improving the machining properties of the blank. The blank has an open-pore ceramic microstructure which has 2 to 50 wt. %, based on the total composition of the dental ceramic blank, of at least one organic Compound. The invention also relates to a method for producing the blank. The milling blank according to the invention clearly exhibits improved material properties compared to unfilled purely ceramic milling blanks which have been milled into blanks for molded prosthetic parts in CAD/CAM methods

Disclosed is a dental implant with a post element that can be inserted into a jawbone and with a mounting element attached to the post element, to which mounting element and dental element can be affixed with the post element designed as a ceramic body of yttrium and/or aluminum oxide stabilized zirconium oxide. Said dental implant should have an even additionally improved ingrowth or integration behavior during the osseous implant healing, compared with the mentioned known concepts. According to the invention, the surface of the dental implant is provided with at least one partial area that has nanoscopic pore or an otherwise executed nanoscopic structure that has a depletion zone with a reduced yttrium and/or aluminum oxide element, compared with the internal volume.

The present invention relates to a composition for use as component of a multicomponent resin-modified glass ionomer cement, to a multicomponent resin-modified glass ionomer cement and also to a process for the preparation of the corresponding compositions and of cured dental materials. The invention furthermore relates to the corresponding use of one or more compounds (S) selected from the group consisting of sulfinic acids, salts of sulfinic acids and salts of organoboron compounds.

A porous material having a hierarchical pore structure, wherein a size and shape of interconnection parts of at least one level pore cavities is consistent with a size and shape of interconnection parts between the level pore cavities and the previous level pore cavities thereof, and an average value of equivalent diameters of the interconnection parts is larger than 45% of that of a diameter of small pore cavities of two adjacent pore cavities of the interconnection parts. The method for preparing the porous material includes: mixing a raw material powder with a pore-forming agent used for preparing the smallest level pores to formulate a slurry; uniformly filling the slurry into a polymeric material frame, and drying and crushing to form mixed grains; then uniformly mixing the mixed grains with the pore-forming agent used for preparing the upper-level pore cavities, forming a compact green body and sintering.

The invention relates to a hardenable multi-part acrylic composition. The composition has at least two parts which react with each other upon being mixed together to progressively harden to form a solid cement, such as a bone cement. The beads in the first part comprise an acrylic bead polymer core produced by suspension polymerisation and having a Tg of >70 C. and emulsion polymerised acrylic microparticles at least partially coating the surface of the acrylic bead polymer core. The microparticles may form a porous coalesced network. The bone cement composition comprises the first part and a liquid second part and optionally, further parts. The parts are operable to form a cement which hardens to a solid mass upon mixing of the parts together. The composition further comprises an acrylic monomer component in the second part and an initiator component. A method of production of coated beads for the hardenable multipart composition and a solid cement is also described.

The present invention intends to provide a gypsum-based embedding material composition for casting, the composition being useful as a rapid-heating type gypsum-based embedding material making it possible to provide a product with which leaving time is made short, which has never been realized in conventional products, and also intends to provide a method for producing the same. A gypsum-based embedding material composition for casting, the composition being a gypsum-based powdery embedding material composition for casting to be used for a rapid-heating type embedding material, the gypsum-based powdery embedding material composition being such that a set product is put into a high-temperature furnace, the set product obtained by adding a malaxation liquid into the composition to perform malaxation and then setting a resultant mixture, wherein the gypsum-based embedding material composition for casting contains as main components calcined gypsum, quartz, and cristobalite, and contains at least one co-pulverized material selected from a co-pulverized material of calcined gypsum and quartz, a co-pulverized material of calcined gypsum and cristobalite, or a co-pulverized material of calcined gypsum, quartz, and cristobalite, and a powdery moisture-retaining component or a liquid moisture-retaining component having a low water content, the composition having an average particle diameter of 30 m or less, and a method for producing the same.