Abstract: The invention concerns a mineral tooth having a silane-coupled adhesive plastic part which enables chemical bonding with base materials being common in dental prosthetics as well as a process for its industrial manufacture.The ground masses of the individual layers of the mineral tooth have grain sizes with a fractionation from about 60 .mu.m to about 100 .mu.m and the adhesive plastic part consists of a multiple component mixture of suitable viscosity and consistency and with 1% to 5% of mineral filler material.With fritting of the ground masses, a defined guidance of both time and temperature is carried out in the range from 600.degree. C. to 900.degree. C., the mineral teeth are silanized for several times in the silane solution and the multiple component mixture is applied without pressure on the mineral tooth and is polymerized-on without pressure by means of a source of heat rays.

Abstract: The reducing socket which is constructed as a cage, is essentially formed by six walls, which are joined together in a cube-shaped or parallelepiped-shaped manner. These walls are provided with openings for the insertion of test vessels. The burrholes of the individual walls are of different sizes. These openings on an individual wall may have both equal and different sizes. The supporting plate which is attached either within or outside of the cage, covers the openings of this wall, which is situated opposite to the wall accommodating the test vessels. If the supporting plate lies within the cage and the size of the test vessel is changed, this plate falls by itself to the wall, the openings of which are covered-up. The reducing socket according to the invention enables the use of different test vessel diameters, without requiring a particular expenditure.

Abstract: The invention concerns a snugly fitting denture such as bridges and the like, consisting of a metallic foundation and of a ceramic facing shell as well as a process to its manufacture. It is the object of this invention to develop a compact system for a snugly fitting denture with high firmness and mechanical loading capacity as well as with prolonged durability under the conditions prevailing in the oral cavity. This is achieved by the fact that the metallic foundation consists of a base metal alloy with a silane-content of .ltoreq.0.5% and that the ceramic facing shell is provided with a silicon-coupled adhesive plastic part. The metal base is silanized in an ultrasound bath, highly fluid prosthesis plastic is applied to its labial aspect and the facing shell is pressed-on. Thus a solid chemical bonding develops between foundation and facing shell. This compact system is without slits and does not offer any possibilities of aggression to harmful influences existing in the milieu of the oral cavity.