 The National Association of Dental Laboratories (NADL) was formed in the United States in 1951 after the merger of Dental Laboratory Institute of America and the American Dental Laboratory Association.It became a federation of state commercial dental laboratory associations.This merger took place in Chicago and then, in 1952, NADL established its headquarters offices in Washington, D.C., which were moved to Tallahassee, Florida later in 2001.