title: Clinical crown length of incisors in 13-year-old boys and girls with different malocclusions.
abstract: The clinical crown length of incisors in 13-year-old children with different malocclusions was compared. The children were classified as follows: II1 Class II, division 1 cases with deep overbite. II2 Class II, division 2 cases. III Class III cases with complete or partial frontal inversion. IV Cases with aplasia of the upper laterals. The groups were subdivided by sex and recruitment was continued until each group contained 30 boys and 30 girls. The results are shown in Table 2. Good agreement was found between boys and girls with respect to the results of measurement of the different variables, comparison of the different malocclusion groups showed that the clinical crown length was greater in groups II1 and III than in groups II2 and IV. Comparison of groups II1 and III showed a somewhat greater crown length of the lower incisors in the prenormal children. The findings are discussed in relation to the following three hypotheses: 1. Proclined incisors have a longer clinical crown than upright incisors. 2. The incisors overerupt in children with large lower facial height, leading to an increased clinical crown length. 3. Local gingival conditions influence the clinical crown length.
mesh_terms: D000293:Adolescent; D002648:Child; D005260:Female; D006801:Humans; D007180:Incisor / Q000033:anatomy & histology*; D008297:Male; D008310:Malocclusion / Q000473:pathology*; D008311:Malocclusion, Angle Class I / Q000473:pathology; D008312:Malocclusion, Angle Class II / Q000473:pathology; D009811:Odontometry