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: Method for dissolving hard-to-dissolve thorium and/or plutonium oxides, especially dioxides such as ThO.sub.2, PuO.sub.2 or (U/Pu)O.sub.2 mixed oxides by heating the oxides in a hermetically sealed vessel in fluoride-free nitric acid. The use of a gas atmosphere containing oxygen in the sealed vessel is advantageous.

Abstract: During the winding of coils with a non-circular shape the wire length necessary varies periodically for a trouble-free winding per unit of time. At a high winding rotational speed and unsatisfactory side ratios relative to the coil being wound, the periodic change in the required wire length is so large that with known wire brakes there is no adequate winding quality with a concurrent protective handling of the wire. These opposite goals are reached through the invention with the aid of a controllable wire brake which essentially consists of a plurality of brake strands wound about the wire in a single layer.