According to ADA specification #1 for amalgam, what is the acceptable dimensional change?: (A) -20 to +20 micron/cm, (B) -10 to +10 micron/cm, (C) -20 to +10 micron/cm, (D) -10 to +20 micron/cm
Answer is A. According to ADA specification #1 for amalgam, the acceptable dimensional change is -20 to +20 micron/cm.
Reference: Marzouk Operative dentistry, pg-108