Prevalence of Class I, Class II, and Class III Malocclusions (Angle) in an Urban Population An Epidemiological Study

¹ Department of Orthodontics, University of Illinois, and The Walter G. Zoller Memorial Dental Clinic, University of Chicago, Chicago, Illinois

The anteroposterior jaw relations of two samples of children were examined to determine the prevalence of normal occlusion and of Class I, Class II, and Class Ill malocclusion in an urban population (Evanston-Oak Park, Ill.). One consisted of 11,036 children from 6-8 years of age, the other of 14,951 children from 12-14. The samples were mixed whites and Negroes; 7,654 of the children had been examined at both ages, making age-change determinations possible.

The data revealed that 69 per cent of the 6-8-year group had been classified as normal, while 54 per cent received this designation at 12-14 years. In the categories of the Angle classification, there were 19 per cent Class I malocclusions in the 6-8-year group, 30 per cent at 12-14; 11 per cent Class II at 6-8, compared to 14 per cent at 12-14; 1 per cent Class III at both ages.

The same children examined at both stages revealed that 27 per cent of those classified as normal at the first examination had developed Class I malocclusion at the second examination, while 43 per cent of those classified as Class I malocclusion at 6-8 years was pronounced normal at 12-14 years.

The prevalence of Class I, Class II, and Class III malocclusion in the sample at 12-14 years was shown to be Class 1, 30 per cent; Class II, 14 per cent; and Class III, 1 per cent.

This article has been cited by other articles:

				T. Yamaguchi, S.B. Park, A. Narita, K. Maki, and I. Inoue Genome-wide Linkage Analysis of Mandibular Prognathism in Korean and Japanese Patients J. Dent. Res., March 1, 2005; 84(3): 255 - 259. [Abstract] [Full Text] [PDF]

				A.A. El-Gheriani, B.S. Maher, A.S. El-Gheriani, J.J. Sciote, F.A. Abu-shahba, R. Al-Azemi, and M.L. Marazita Segregation Analysis of Mandibular Prognathism in Libya J. Dent. Res., July 1, 2003; 82(7): 523 - 527. [Abstract] [Full Text] [PDF]