To provide a method for producing a calcium carbonate block for medical use which is useful as a bone substitute or a bone substitute raw material needed in medical care, which is a method for producing a calcium carbonate block that satisfies the following desired properties: 1) the calcium carbonate block has excellent mechanical strength; 2) the calcium carbonate block can be produced by a simplified production method; 3) the calcium carbonate block contains no impurity; and 4) the calcium carbonate block has high reactivity.

A method for producing a calcium carbonate block, comprising a step of shaping a water-containing calcium hydroxide block and a carbonation step of immersing the calcium hydroxide block in a carbonate ion-containing aqueous solution.

A process for providing a topography to the surface of a dental implant, the surface being made of a ceramic material having yttria-stabilized zirconia, the process including: providing a macroscopic roughness to the surface of the dental implant by a mechanical process and/or injection molding technique; and etching at least a part of the roughened surface, wherein etching is carried out using an etching solution having hydrofluoric acid at a temperature of 70 C. at least, such that discrete grains or agglomerates of grains are removed from the yttria-stabilized zirconia, thereby forming recesses and cavities in the roughened surface is disclosed.

This disclosure provides bioceramic compositions of multiparticulate crystalline multimetallic silicates having silica double tetrahedra structures, such as Strontium-akermanite (Sr.sub.2MgSi.sub.2O.sub.7), Akermanite (Ca.sub.2MgSi.sub.2O.sub.7), Baghdadite (Ca.sub.3ZrSi.sub.2O.sub.9), Hardystonite (Ca.sub.2ZnSi.sub.2O.sub.7), as sources for controlled release of multiple metallic ions, such as Ca.sup.2+, Mg.sup.2+, Zr.sup.4+, Sr.sup.2+, Zn.sup.2+ for medical and dental use. This disclosure also includes medical and dental uses of the disclosed compositions, for example, in tissue regeneration, including bone tissue.

A bone substitute material is disclosed consisting of a zirconium dioxide ceramic having preferably an open porosity. The bone substitute material can be used in particle form or in block form.

A dental implant made of a ceramic material including an implant surface having at least partially a contact angle of less than 20, the implant surface being at least partially covered by a protective layer. The protective layer includes a dextran having a molecular weight of more than 15,000 Da.

Macroporous cement compositions, methods of making the same, and methods of using the same, are described.

The present invention relates to a composition of an intracanal medication agent for medicating root canals for a predetermined period of time. According to one aspect of the invention, there is provided an intracanal medication composition based on a calcium hydroxide component, comprising: calcium hydroxide or a calcium hydroxide producing component as a powder component; and at least one of diethyl sulfoxide (DMSO), N-methyl-2-pyrrolidone (NMP) and diethylene glycol monoethyl ether (DEGEE) as a liquid component.

Disclosed is a ceramic sliding partner for a sliding bearing, said sliding partner being made at least in part, preferably entirely, of a ceramic foam. The ceramic sliding partner comprises at least one sliding surface on which a sliding partner can move, said sliding surface being made at least in part, preferably entirely, of a ceramic foam.

The invention relates to a porous zirconia article in particular for use in the dental or orthodontic field, the porous zirconia article comprising ZrO.sub.2: 80 to 87 wt. %,Y.sub.2O.sub.3: 3 to 5 wt. %, AI.sub.2O.sub.3: 10 to 14 wt. %, wt. % with respect to the weight of the porous zirconia article, the porous zirconia article being characterized by a BET surface from 15 to 100 m.sup.2/g. The invention also relates to a sintered zirconia article in particular for use in the dental or orthodontic field, the sintered zirconia article comprising ZrO.sub.2: 80 to 87 wt 5, Y.sub.2O.sub.3: 3 to 5 wt. %), AI.sub.2O.sub.3: 10 to 14 wt. %, wt. %) with respect to the weight of the porous zirconia article, the sintered zirconia article being characterized by a corundum crystal phase content of 7 to 12 wt. %>and a flexural strength of at least 2,000 MPa.

Provided is a production method that can easily produce a calcium carbonate porous sintered body. The production method includes the steps of: preparing a dispersion liquid containing calcium carbonate and a gelling agent; adding a foaming agent to the dispersion liquid, followed by stirring until foamy to make a foam; turning the foam into a gel; and sintering the gelled foam to produce a calcium carbonate porous sintered body.