Abstract: An artificial dental appliance for bridging the distance between two adjacent teeth. The appliance includes a bridge for filling the space between the two adjacent teeth and retaining structure for securing the bridge to the two adjacent teeth. The retaining structure includes a pin for extending transversely through a groove formed in the side of one of the teeth and through a groove formed in one side of the bridge.

Abstract: A device affixed to a centrifugal force casting machine that developes a vacuum as it travels through the air on the spinning arm of the casting machine. The developed vacuum is used to evacuate unwanted gasses from a casting mold.

Abstract: A dental model supporting articulator has an upper articulation tongue and a lower articulation tongue and pivotal means connecting the tongues to each other; first and second dental model mounting plastic slide members are removably mounted on the upper and lower articulation tongue members. Each slide member has retaining flanges and positioning means engageable with an articulation tongue member for insuring that the slide member is always accurately positioned in a single unchanging position on the tongue member; each slide also has anchor means engageable with a connecting mass of self-setting hardenable material in which the gum portion of a dental model is embedded so that upon hardening of the connecting mass the model supporting slide, the connecting mass and the model constitute a unitary structure which can be removed from the articulation tongue but can be returned to its original position on the articulation tongue.