GB191004625A - Improvements in and relating to the Manufacture of Artificial Teeth. - Google Patents

Abstract

4625. Eldred, B. E. June 23, 1909, [Convention date]. No Patent granted (Sealing fee not paid). T e e t h, artificial.- Cased dental pins are baked with the teeth, the ends of the basemetal cores being kept from contact with the tooth plastic, preferably by inert mineral matter such as a l u m i n a. Naked base-metal pins may be used by first painting with a basic enamel, such as a mixture of magnesia or alumina with a little water-glass or tooth plastic. The headed pins 6 are placed in the mould, ignited alumina 8 is applied as powder or paste, and the tooth plastic 9 moulded round them in the usual way. After firing, the outer ends of the pins may be covered with gold solder. The pins are preferably cut from wire in which the platinum sheath has been united to the core either directly, as by casting one metal against the other in a liquid state, or by first welding on to the core a coating of copper, silver, or gold as described in Specifications 8913/06, 8913A/06, and 20,788/08, [all in Class 83, Metals, Cutting &c.]. The alumina may be replaced by platinum foil. The exposed end of the core may be deeply recessed, or the platinum sheath arched over it.