Many dentists criticized the poor quality of the early amalgam restorations and this controversy led to the “amalgam war” from –
1820  to  1830
1840  to  1850
1870  to  1880
1880  to  1890
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