Abstract: Methods and apparatus are set forth for preparing and delivering bone cement formed by combining a powdered polymer component and a liquid monomer component. The powdered polymer component is stored in an evacuated mixing chamber. The liquid monomer component, according to one specific aspect of the invention, is introduced into the mixing chamber by a control mechanism which causes the stored powder to be "substantially wet", i.e., all of the powdered polymer component is wet to at least some degree and is otherwise devoid of powder pockets. The control mechanism, according to a preferred embodiment of the invention, stages the release of the liquid monomer into the vacuum packed powder chamber, under the effect of the vacuum, in a timed sequence using a plurality of monomer distribution channels.

Abstract: A nonprecious alloy for fixed dental restorations such as for porcelain fused to metal, plastic veneered crown and bridge, nonveneered crown and bridge, inlays, etc. includes the following ranges of constituents in percentages by weight:Constituent Proportional Range ______________________________________ Nickel Balance Chromium 12-15% Aluminum 0-1% Silicon 0-1% Tin 0-1.25% Manganese 0.01-0.75% Gallium 4.5-8% Molybdenum 5-8% Iron 3-10% ______________________________________With the proviso that the combined percentage of tin, gallium and silicon must be at least 5.75%.