Abstract: A casting system includes an enclosure for covering a bowl-shaped entry port to an investment cavity for use in the lost-wax casting process. A delivery system is provided for delivering an inert gas to the enclosure to displace the original atmosphere which is driven out an exit port. The gas delivery system also provides a high-pressure environment in the enclosure for forcing molten metal, contained in the entry port, to pass by sprues into the mold cavity. Induction heating is provided for melting a solid metal ingot, controlled by a timer and pyrometer to occur prior to the injection, as well as during and optionally subsequent to the injection of compressed inert gas. The casting system is particularly useful for light-weight metals which can be cast only with difficulty in a centrifuge and is also modified for application to glass ingots and metals which do not heat well by induction.

Abstract: A dental articulator has a tooth supporting tray secured to a platform by a key and keyway wherein the sidewalls of the keyway are resiliently supported to permit yielding of the sidewalls to overcome any clogging by particulate matter which may be present in a place of use of the articulator. A set of legs upstanding from the tray maintains orientation of the tray relative to the platform.