The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 27, 1983
Filed:
Aug. 31, 1981
Theo S Chervenelekov, Sofia, BG;
DSO 'pharmachim', Sofia, BG;
Abstract
Device for the production of temporary dental crowns having a die and a matrix. The die is an artificial tooth having a shape closely approximating that of the tooth being restored, a fixing and supporting shaft protruding from the middle of the artificial tooth. The matrix is cup-shaped with a recess into which an elastic ring is placed, the elastic ring pressing inwardly a plastic foil from which the temporary crown is formed about the die as it is thrust into the elastic ring. The relaxed internal diameter of the internal ring is smaller than the size of the lower part of the tooth being restored. Concentrically with the space in the open end of the matrix there is provided a socket with an outside flange within which the outer edge of the plastic foil is initially held. The device can produce temporary plastic dental crowns which closely approximate the shape of the tooth being restored, and it is easy to take the crown off the matrix and the die without any damage thereto.