Dr. Clarence Carnot Evans, 81, professor emeritus and former head of the departments of orthodontics and clinical dentistry at Howard University, died Tuesday at George Washington University Hospital of complications after surgerly. He had an ulcer.

He retired from the university's School of Dentistry in 1967 but continued in the private practice of orthodontics until 1977. He lived in Washington.

Dr. Evans was born in Annapolis and came to Washington with his family as a boy. He was a graduate of the old M Street High School.

He earned a liberal arts degree from Howard University and graduated from its College of Dentistry in 1919, when he began the private practice of dentistry in Washington. He also served as a clinician in the D.C. public school system.

When the College of Dentistry was reorganized at Howard in 1929, he became head of the department of clinical dentistry, a position he held until 1953.

Dr. Evans took postgraduate work at the University of Toronto, where he became interested in orthodontics. In 1937, he received a master's degree in denistry from Northwestern University, with emphasis on orthodontics.

Dr. Evans was the author of numberous articles and papers in his field. He had received a nummber of honors from Howard University and its School of Dentistry as well as from dental organizations.

He was a Fellow of the American College of Dentists, a life member of the Robert Freeman Dental Society, the D.C. Dental Society and the American Dental Association and a member of the National Dental Association, the Middle Atlantic Othodontic Society, the American Association of Orthodontist, the Orthodontic Alumni Society of Columbia University and the American Association of University Professors.

He is survived by his wife of 54 years, the former Mary Dulaney, a son, Dr. Clarence Carnot Jr., two sisters, Ethel E. Price and Carolyn E. Wright, and two brothers, Randall R. and Robert C., all of the Washington, and three grandchildren.