Abstract: A temperature resistant material consisting of fiber-reinforced glass and fiber-reinforced ceramics, respectively, is described as asbestos substitute in devices for handling hot glass, glass ceramics and ceramics objects.

Abstract: An optical fluorophosphate glass with an anomalous positive incremental dispersion +.DELTA..nu..sub.e between 11.8 and 12.5, a refractive index n.sub.e between 1.53 and 1.55 and an Abbe coefficient .nu..sub.e between 72.8 and 73.5 has the following atomic composition (in atom %): Mg: 2.0-3.5, Ca: 2.5-4.5, Sr: 13.0-16.0, Ba: 22.0-25.0, Al: 4.5-6.0, K: 0.1-0.3, P: 9.0-12.0, O: 17.0-20.0 and F: 20.0-23.0, the F/P ratio lying between 1.8 and 2.4 and the sum of the alkaline earths between 39.5 and 49. The new glasses are melted from a material having the following initial composition (in wt. %): Ca(PO.sub.3).sub.2 : 1.0-2.5, Ba(PO.sub.3).sub.2 : 23.0-25.5, Al(PO.sub.3).sub.3 : 12.0-14.5, MgF.sub.2 : 6.5-8.5, CaF.sub.2 : 5.5-8.0, SrF.sub.2 : 16.0-19.0, AlF.sub.3 : 10.0-12.5, SrO: 2.0-3.0, BaO: 12.5-14.5 and K.sub.2 TiF.sub.6 : 0.2-0.7, the alkaline earth fluorides content lying between 28.0 and 35.5 and the total content of all fluorides used between 38.2 and 48.7.

Abstract: Optical fluorophosphate glass which is based on Mg(PO.sub.3).sub.2, Ca(PO.sub.3).sub.2, Ba(PO.sub.3).sub.2, Al(PO.sub.3).sub.3, MgF.sub.2, CaF.sub.2, SrF.sub.2, AlF.sub.3, BaO and SrO and has a refractive index n.sub.e between 1.515 and 1.546, an Abbe value .nu..sub.e between 75.8 and 77.4 and a positive anomalous partial dispersion value .DELTA..nu..sub.e between 14.85 and 15.15.The glass comprises (in weight-%) 2.4-2.7 Mg; 4.5-4.9 Ca; 15.9-17.6 Sr; 20.2-22.3 Ba; 5.6-6.2 Al; 8.8-9.7 P; 22.0-24.3 F and 15.7-17.4 O. The improved physico-chemical parameters, such as linear expansion coefficient, glass transition temperature T.sub.g, density .zeta., Knoop-hardness HK, etc., are stated. Finally, a production process for this optical glass is described.

Abstract: The use is described of oxide ceramic materials for compression molds for shaping elements made from glass or a glass-containing ceramic and having high surface quality and tight tolerances. The materials are polycrystalline, monophasal or polyphasal materials which are contact-inert towards the optical elements to be pressed and which, in addition, have significantly better mechanical and thermal properties than monocrystalline substances, which, in principle, exhibit an anisotropic behavior as a consequence of their geometrical anisotropy. The material intended for use according to the invention can comprise a Al.sub.2 O.sub.3 ceramic or a ZrO.sub.2 -- and/or HfO.sub.2 -containing ceramic. The material can also be built up in several phases, i.e. can contain a matrix component and at least one particle component dispersed discretely in it. They are preferably ZrO.sub.

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 glass which is based on Mg(PO.sub.3).sub.2, Ca(PO.sub.3).sub.2, Ba(PO.sub.3).sub.2, Al(PO.sub.3).sub.3, MgF.sub.2, CaF.sub.2, SrF.sub.2, AlF.sub.3, BaO and SrO and has a refractive index n.sub.e between 1.515 and 1.546, an Abbe value .nu..sub.e between 75.8 and 77.4 and a positive anomalous partial dispersion value .DELTA..nu..sub.e between 14.85 and 15.15.The glass comprises (in weight-%) 2.4-2.7 Mg; 4.5-4.9 Ca; 15.9-17.6 Sr; 20.2-22.3 Ba; 5.6-6.2 Al; 8.8-9.7 P; 22.0-24.3 F and 15.7-17.4 O. The improved physico-chemical parameters, such as linear expansion coefficient, glass transition temperature T.sub.g, density .zeta., Knoop-hardness HK, etc., are stated. Finally, a production process for this optical glass 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.