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Historical
ANSI/ADA Specification No. 20-1972 (Reaffirmed 199
Dental Duplicating Material
This specification covers thermo-reversible and nonreversible (chemical setting) duplicating materials for use in the dental laboratory. Duplicating materials covered by this specification are classified as Type I - thermo-reversible materials (which includes Class 1 - Hydrocolloidal and Class 2 - Nonaqueous organic thermoplastic) or Type II - Nonreversible (which includes Class 1 - Hydrocolloidal and Class 2 - Nonaqueous organic).
CONTENT PROVIDER
American Dental Association [ada]
American Dental Association [ada]