Abstract: Optical fluorophosphate glasses based on Ba(PO.sub.3).sub.2, Al(PO.sub.3).sub.3, alkaline earth metal fluorides and AlF.sub.3 are described which have a refractive index n.sub.e between 1.47 and 1.50, an Abbe-value .nu..sub.e between 85 and 80 and a positive anomalous partial dispersion value .DELTA..nu..sub.e between +17 and +22. They comprise (in wt.-%) 0.5-3 Mg, 8-10 Ca, 12-20 Sr, 9-12 Ba, 7-9 Al, 5-9 P, 8-12 O and 35-38 F. Ti, Na, K and H may additionally be present. The improved physico-chemical parameters (expansion coefficient, glass transition temperature, density, Knoop-hardness) and the transmission characteristics are given, and a process for producing these optical glasses is described.

Abstract: A tooth-root implant of high fatigue strength, intended for a two-stage implantation technique, comprises a sleeve (1) which, in its inner region, has retention means (6b), on which a pressure plate (2a) rests loosely. An insertable superstructure bearing (3) is arranged on the pressure plate (2a) and is surrounded, at least partially, by a plastic casing (4). A screw plug (5) is also provided which closes off the upper part of the sleeve (1) in such a way that positive contact is made.

Abstract: Optical fluorophosphate glasses based on Ba(PO.sub.3).sub.2, Al(PO.sub.3).sub.3, alkaline earth metal fluorides and AlF.sub.3 are described which have a refactive index n.sub.e between 1.47 and 1.50, an Abbe-value .nu..sub.e between 85 and 80 and a positive anomalous partial dispersion value .DELTA..nu..sub.e between +17 and +22. They comprise (in wt.-%) 0.5-3 Mg, 8-10 Ca, 12-20 Sr, 9-12 Ba, 7-9 Al, 5-9 P, 8-12 O and 35-38 F. Ti, Na, K and H may additionally be present. The improved physico-chemical parameters (expansion coefficient, glass transition temperature, density, Knoop-hardness) and the transmission characteristics are given, and a process for producing these optical glasses is described.

Abstract: Inorganic material resisting to high temperatures for installations intended to form structural glass elements which, owing to the precision and the quality of the forming surface, do not require after forming any other surface treatment. The material is comprised of at least one forming surface based on at least one from the groups of a metal oxide a double metal oxide, and a crystalline solid solution. It has a monocrystalline structure. Preferred materials are Al.sub.2 O.sub.3, Cr.sub.2 O.sub.3, MgAl.sub.2 O.sub.4 and/or ZrO.sub.2.

Abstract: Composite materials for prosthesis purposes are indicated, which consist of a plastics matrix and an inorganic radiopaque filler which, as the essential components, contains a combination of compounds of the elements Gd, Sr and, if appropriate, La. The proportion of filler in the total composite material is between 20 and 90% by weight.The filler particles are in a silanized form of glass and/or glass ceramics and/or a sintered product and/or in the form of a mixture of their starting components and comprise (in % by weight): 1-31 of Gd.sub.2 O.sub.3, 7-32 of SrO, 0-18 of La.sub.2 O.sub.3, 14-62 of SiO.sub.2, 0-30 of B.sub.2 O.sub.3, 1-33 of Al.sub.2 O.sub.3 and 0-16 of Na.sub.2. A partial replacement of one or more of the radiopacity-causing compounds (Gd.sub.2 O.sub.3 SrO, La.sub.2 O.sub.3) by oxides of the elements Ca, Mg, Y, Zr, Ti, Ta and/or Nb is possible.

Abstract: An auditory ossicle prosthesis is described comprising a plate (1) with a groove (7) applied to its upper side and a shaft (2) eccentrically applied to its lower side. The prosthesis consists of a bioactive material and contains additionally at least in one partial area an insoluble bioinert material, which is applied mainly as a coating material in the form of an additive layer (S(+)) or a subtractive layer (S(-)). Suitable coating processes and substances are disclosed. If S(-) layers are applied, they may be exposed subsequently to a sealing and/or silanizing treatment.

Abstract: Prosthesis for the partial or complete reconstruction of the rear auditory canal wall, with a hollow cylindrical sleeve shape (1), not closed, and having at least in its two base areas (9) and (10) differential expansions in the manner of a hyperboloid with a preferentially elliptic cross section. A bioactive substance is used as the material. The inner wall of the prosthesis has a positive or negative (spatial) coordinate grid (6, 7). Selected partial surface areas (11, 12; 4) may be provided with an insoluble, bio-inert protective layer. The latter may consist of an additive protective layer (S(+)) or a substractive protective layer (S(-)). Appropriate coating processes are cited for both of these variants. When S(-) layers are produced, these may be exposed to a subsequent sealing and/or silanizing treatment.

Abstract: An auditory ossicle prosthesis is described, comprising a plate (1), a shaft (2) applied eccentrically to the underside (3) of the plate and a groove (7) set into the top side (8) of the plate. The plate (1) has a mirror symmetric configuration with respect to at least one symmetry plane (5) perpendicular to the plane of the plate (8). The shaft (2) is applied so that its contact surface (4) is located on the trace (5) of the (principal) symmetry plane (5) of the plate (1), but at least removed from the boundary area of the plate (1) by one half of the shaft cross section. Preferably, the axis (9) of the shaft (2) includes with the normal (10) of the underside (3) of the plate an angle .alpha. of the order of magnitude of .alpha.=15.degree..+-.5.degree.. The groove (7) is arranged in the top side (8) of the plate, in its front half and aligned perpendicularly to the symmetry plane (5) of the prosthesis. The prosthesis may consist of a single piece or of two pieces. It consists of a bioactive material.

Abstract: Disclosed are novel prosthesis parts of improved properties which are obtained by providing a material as used for prosthesis with an enamel or enamel-like coating and incorporating in said enamel layer, while in a viscous state, a bio-active material. Such prosthesis parts have a satisfactory adhesive strength and coefficient of expansion, are substantially free of pores, are highly corrosion resistant, and readily grow intimately and firmly together with the bone tissue without the use of bone cement.

Abstract: Fluorophosphate glass free of beryllium with a refractive index n.sub.e between 1.40 and 1.46, an Abbe value v.sub.e between 85 and 94 and a high positive anomalous partial dispersion value +.DELTA.v.sub.e between 19 and 28 is described. The glass is melted from a mixture containing as groups of components metaphosphate, fluorides and an alkali fluoroborate in certain proportions expressed in % by weight, in the following manner: the intermixed mixtue is heated to a temperature between 800.degree. and 800.degree. C., the melt refined at a temperature between 900.degree. and 1000.degree. C. for a period of 8 and 25 minutes, homogenized at a temperature between 900.degree. and 1000.degree. C. within a period of time of 5 to 15 minutes, the temperature reduced to a pouring temperature between 575.degree. and 650.degree. C. and the melt poured into casting molds preheated to approximately 320.degree. C., in particular aluminum molds.

Abstract: Disclosed are zirconium-containing borosilicate glass compositions having a refractive index n.sub.e between 1.55 and 1.72, and Abbe number .nu..sub.e between 50 and 34 and a negative anomalous partial dispersion value .DELTA..nu..sub.e between -3.0 and -7.7. Also disclosed is a process for the production of such glass compositions.

Abstract: Novel prosthesis parts of improved properties are obtained by providing a material as used for prostheses with an enamel or enamel-like coating and incorporating in said enamel layer, while in a viscous state, a bioactive material. Such prosthesis parts have a satisfactory adhesive strength and coefficient of expansion, are substantially free of pores, are highly corrosion resistant, and readily grow intimately and firmly together with the bone tissue without the use of bone cement.

Abstract: A valuable composite material is produced by sintering together a first starting material A composed of at least one mineral component, preferably of the apatite group and a second starting material B composed of an inorganic multi-component system, such as a glass or a glass ceramic material which may contain at least one modifier. The modifier may be an agent causing under the sintering conditions foaming of the composite material, such as a carbonate, or it may be a radioactive agent. The first starting material may also contain an inorganic permutite serving as ion exchange agent. The composite material is useful as implant material in the animal and human body for replacing damaged bones or teeth, as a radioactive source, for instance, for exposing the body to radioactive irradiation, as an ion donor, for instance, for supplying the body with calcium, magnesium, and/or potassium ions, as a filter material for removing harmful agents from the body, and for other purposes.

Abstract: The composite material for prosthetic purposes of the present invention is essentially composed of a plastic matrix, preferably of a methacrylate plastic, and at least one bioactive filler material, preferably a glass ceramic material of apatite crystal structure. The finely comminuted bioactive material may be homogeneously or nonhomogeneously incorporated in the plastic matrix. Reinforcing additives such as glass fibers and the like may also be incorporated into the mixture of plastic matrix and bioactive material in order to improve the mechanical strength properties. The bioactive material may be admixed to a mixture of methacrylate monomer and curing agent or to a prepolymer obtained therefrom. The composite material is useful as bone cement bone or tooth replacement material, and in general for prosthetic purposes in surgery and orthopedics.

Abstract: A fluorophosphate glass of a high positive anomalous partial dispersion .DELTA..nu..sub.e within the range of from about +10.0 to about +21.0, a relatively high index of refraction n.sub.e within the range of from about 1.47 to about 1.54, and an Abbe number .nu..sub.e within the range of from about 84.1 to about 51.0 is provided. A simple process of melting such a glass is disclosed.

Abstract: The glass ceramic material of the present invention has the following composition, in weight percent,:About 20 to about 60 percent of silicon dioxide SiO.sub.2,about 5 to about 40 percent of phosphorus pentoxide P.sub.2 O.sub.5,about 2.7 to about 20 percent of sodium oxide Na.sub.2 O,about 0.4 to about 20 percent of potassium oxide K.sub.2 O,about 2.9 to about 30 percent of magnesium oxide MgO, andAbout 5 to about 40 percent of calcium oxide CaO,and may contain betweenAbout 0.5 and about 3.0 percent of fluorine.The glass ceramic material is produced by melting the mixture of components and subjecting the resulting melt to a specific annealing or tempering treatment to cause formation of nuclei and ceramization. Such glass ceramic material is especially useful as bone and tooth replacement material in humans and animals.

Abstract: Optical silicate glasses containing titanium dioxide and having a high index of refraction and high dispersion are composed of1 % to 10 %, by weight, of silicon dioxide SiO.sub.2,30 % to 50 %, by weight, of barium oxide BaO,18 % to 24 %, by weight, aluminum oxide Al.sub.2 O.sub.3, and21 % to 30 %, by weight, of titanium dioxide TiO.sub.2.In such glasses the barium oxide can be replaced partially by sodium oxide Na.sub.2 O, beryllium oxide BeO, calcium oxide CaO, strontium oxide SrO, cadmium oxide CdO, gadolinium oxide Ga.sub.2 O.sub.3, indium oxide In.sub.2 O.sub.3, or yttrium oxide Y.sub.2 O.sub.3. Likewise, the silicon dioxide therein can be replaced partially by boron trioxide B.sub.2 O.sub.3, lead monoxide PbO, germanium dioxide GeO.sub.2, stannic oxide SnO.sub.2, zirconium oxide ZrO.sub.2, hafnium oxide HfO.sub.2, or thorium oxide ThO.sub.2.

Abstract: A fluorophosphate glass which has an index of refraction n.sub.e of more than 1.57, an Abbe number .nu..sub.e of less than 70, and a relatively high positive anomalous partial dispersion +.DELTA..nu..sub.e is provided.