GB1156147A - Artificial Tooth - Google Patents

Abstract

1,156,147. Artificial teeth. VITA ZAHNFABRIK H. RAUTER. 22 Sept., 1966 [27 Sept., 1965], No. 42276/66. Heading A5R. An artificial bridge tooth comprises (i) a tooth body having formed therein a cavity so shaped that the tooth body has substantially longitudinal recesses therein, a step running perpendicular to the longitudinal axis of the tooth being formed in the base of the cavity and the body having also longitudinally extending wing-like lateral ridges directed in use towards the mouth, and (ii) a support core adapted for fitting in the cavity between the ridges and having protrusions adapted for fitting in the recesses and a face steped correspondingly to the base of the cavity. The tooth is preferably provided at its rear side with a longitudinal pin by means of which the tooth may be fixed to dentures or a bridge plate. As illustrated, tooth body 1 comprises a portion 7a, forming plateau 7 which is separated from lateral ridges 3 by troughs 8. Support core 2 comprises lateral ridges 9 adapted to engage in the troughs 8 of the tooth body. When the tooth is assembled, step 4 of the tooth, body abuts step 5 of the support core, step 6 of the tooth body abuts one edge of the support core, and portion 12 of the tooth body is engaged by tongue 13 formed on the support core; Retained on the plateau 7 of the tooth body is a longitudinal pin 10 which passes through hole 11 formed in the support core, thereby securing the support core to the tooth body; the pin may be made of a noble metal. In the absence of such a pin, the troughs 8 may be parallel and shaped to engage with corresponding parallel ridges 9; in this embodiment, the troughs 8 may be undercut in dovetail shape and the ridges 9 shaped correspondingly so that the support core may be slid laterally into the tooth body.