Excerpt from Progress Report on Dimensional Changes in Amalgam: January 20, 1971
Opted an international Specification for alloy for dentalamalgam in which the linear setting change during hardening was restricted to 0 to +o.20% at 37°c on an unrestricted Specimen with a fiducial reading when the Specimen is 15 minutes old.(ll) This was supposed to allow for the effects for mechanical amalgamation, testing at mouth temperature, and restriction of expan Sion in clinical restorations. The latest change, effective June 1, is 0 r 20%on an unrestric ted Specimen with a fiducial reading when the Specimen is 5 minutes old and the amalgam is mixed and packed mechanically.
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