Le Roy Robert Palmer Jr., 57, a dental technician in the Washington area for many years, died of cancer Monday at Providence Hospital. He lived in silver Spring.

Mr. Palmer, who was born in Charleston, S.C., served in the Army during World War II and the Korean conflict. He graduated from the Krepel School of Dental Technology in New York City and moved to Washington about 1949.

From 1957 to 1968, he was an instructor at the Howard University college of dentistry and received a citation for his work there. For the next three years, he worked at a health facility in New York City. He then returned to this area and settled in Adelphi. From 1972 to 1977, he ran the Garwyn Dental Laboratory, a firm he founded in Baltimore.

In 1977, Mr. Palmer established a firm in Hyattsville and moved to Silver Spring. From 1979 until earlier this year, he worked at the Cardozo Community Health Center.

Mr. Palmer was a member of the National Board of Certification for Dental Technology.

Survivors include his wife, Rita Dent Palmer, of Silver Spring; two sons, Air Force Maj. Le Roy R. III, of Wichita Falls, Tex., and Stephen M., of Washington; his father, Le Roy R. Sr., of Charleston; two brothers, George, of Trenton, N.J., and Herman, of Brooklyn, N.Y.; two sisters, Margherita Fielding of Charleston, and Ruth Eagle of The Queens, N.Y., and one grandson.