 However, Corruccini's research into malocclusion led him to conduct broad and comprehensive studies among a diverse number of subjects, including an isolate population of European-Americans in rural Kentucky, the Pima Tribe, natives of Peru, hominoids, and modern Chinese.Corruccini's long term research into the origins of malocclusion led him to the conclusion that not all cases could be solely attributed to genetic factors.In 1982, Corruccini and Beecher published the results of a study on squirrel monkeys that revealed that diet may play a significant role in occlusal health.