Investment material and mold for dental use and burnout thereof

Details Investment material and mold for dental use and burnout thereof Investment material and mold for dental use and burnout thereof

1992-04-06

1994-12-20

Bradley, P. Austin

Metal founding

Process

Shaping a forming surface

106 35, 106 389, B22C 100

Patent

active

053738918

ABSTRACT:
Dental investment materials for providing inexpensive dental investments which are free from the occurrence of cracks, crevices or breakage and can greatly reduce the metal casting time, dental casting molds using the same and a process for burning them. The dental investment material contains as the major components a calcined gypsum powder, a cristobalite powder and a quartz powder and additionally contains a gas permeability improving additive. In the dental investment prepared using such dental investment material, the thermal expansion can be dispersed and the steam pressure generated can be released effectively during calcination and burning.

REFERENCES:
patent: 4604142 (1986-08-01), Kamohara et al.
patent: 4814011 (1989-03-01), Kamohara et al.
patent: 4909847 (1990-03-01), Ohi et al.
Skinner et al., The Science of Dental Materials, 1991, 6th Ed. W. B. Saunders Company, USA, p. 425.
R&R Ultra-Vest Data Sheets (three pages), 1985.

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