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