An improved method of and means for molding artificial teeth

• Format: Patent
• Language: English
• Published: 26.05.1931
• Subjects: APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE; DENTISTRY; HUMAN NECESSITIES; HYGIENE; MEDICAL OR VETERINARY SCIENCE

349,589. Moulding artificial teeth. DIMELOW, T. E., 431, West Springettes. burg Avenue, York, Pennsylvania, U.S.A. Jan. 25, 1930, No. 2671. [Class 81 (ii).] In a process for moulding artificial teeth, in the manner described in Specification 254,075, [Class 81 (ii), Medical &c. appliances], wherein the body porcelain is first moulded and biscuited, and the light coloured enamel porcelain forming the incisal edge and covering only the central and incisal portions of the labial surface is then moulded thereon, the cervical end of the tooth is pressed between mould surfaces of identical form throughout both the moulding steps. The mould used in the final step may be an ordinary two-part mould, Fig. 2, fine surface markings having been obtained on the part 3 by pressure with a hardened steel master tooth model or die in position in the mould recess. A second and identically marked upper portion 3a is formed by pressure with the same die and is then cut away to the form shown in Fig. 3, leaving only the cervical portion 5 of the tooth moulding recess. The recess is then completed, in the form necessary for moulding the body portion of the tooth, by attaching a shaped metal bar 6a, Fig. 4, in the cutaway portion 9 of the mould 3a. The bar 6a is secured by a wedge 11 or by a screw 12 or by both means. In a modified process, instead of using the part 3, Fig. 2, for the final moulding step, the bar 6a is removed from the mould 3a and replaced by a bar serving to complete the moulding recess in the form of the complete tooth, pressure with the master tooth die being again employed to give the desired surface markings on the bar. In either modification of the process the assemblage comprising the parts 3a, 6a, Fig. 4, may be replaced by a one-piece upper half mould casting formed by using the assembled parts as a pattern. The surface markings may be formed on the part 3a after the bar 6a has been secured thereto by employing a tooth die which has been ground away to the form of the body portion of the tooth.