Arthur Merril, 93, a retired oral surgeon and longtime chief of the dental department at D.C. General Hospital, died of cardiovascular disease Sept. 7 at Shady Grove Hospital. He lived in Rockville.

During his career, Dr. Merril conducted research on the use of antibiotics in the prevention of bacterial infections following dental procedures and oral surgery. He spent 32 years at D.C. General Hospital before retiring in 1972. He then worked four years as supervisory dental officer at the Upshur Street Dental Clinic in Washington.

He also was a special lecturer in oral surgery at Georgetown University and an associate clinical professor in oral surgery at Howard University.

He served as regional vice president of the American Association of Hospital Dental Chiefs and Dentists, and he did research and conducted studies for the American Federation for Clinical Research.

He was a native of New York City and a graduate of New York University.

After receiving a degree in dentistry and oral surgery from Columbia University, Dr. Merril worked as an oral surgeon and anesthetist at Brooklyn Jewish Hospital and the Hebrew Orphan Asylum.

His hobbies included tennis, bridge, chess and pinochle.

Survivors include his wife of 65 years, Martha Merril of Rockville; two sons, Dr. Carl Merril of Bethesda and Steve Merril of Fairfax; four grandchildren; and a great-granddaughter.