Plastic and nonmetallic article shaping or treating: processes – Dental shaping type
Patent
1984-07-19
1986-10-14
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Dental shaping type
249142, 249155, 249161, 249164, 264245, 4332031, A61C 13107, A61C 1309, A61C 1910
Patent
active
046171592
ABSTRACT:
A mold for preparing a plug suitable for making a dental shade sample having a layer of porcelain material having a known thickness; the mold comprises: a base with a cylinder extending upwardly therefrom; a planar platform surface at the upper end of the cylinder, the cylinder being threaded in a region below the platform surface; and a hollow annular housing defining an internal cylindrical surface sized and cooperatively threaded to engage the cylinder threads. Rotation of the housing relative to the cylinder moves the housing vertically and continuously varies the known depth of the cavity between the housing and the platform surface. By proper positioning of the housing and cylinder a known desired cavity depth is obtained and filled with porcelain-forming material to mold a first shade layer. The housing is rotated to increase the cavity depth by known desired increments for subsequent layers.
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Tylman, Stanley D., Theory and Practice of Crown and Bridge Prostaesdis, St. Louis, MO, C. V. Mosby, 1940, p. 483.
Johnston, John F..; George Mumford and Roland W. Dykema, Modern Practice in Dental Ceramics, Philadelphia, PA, W. B. Saunders, 1967, pp. 1, 9-11.
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