Many dentists criticized the poor quality of the early amalgam restorations and this controversy led to the “amalgam war” from –: (A) 1820  to  1830, (B) 1840  to  1850, (C) 1870  to  1880, (D) 1880  to  1890
Answer is B. Many dentists criticized the poor quality of the early amalgam restorations.This controversy led to the “amalgam war” from 1840 to 1850.
Reference: Phillip’s Science of Dental Materials, Pg-8