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Variations of Mandibular Variables in Skeletal Orthodontic Anomalies

The object of the study was to determine the size of the mandibular angle, height of the ramus and length of the mandibular corpus, and to compare the obtained results, depending on the type of skeletal orthodontic anomaly, age and gender of the subject. Seventy-seven subjects participated in the study (30 male and 47 female) with diagnosed anomalies of open bite, mandibular prognathism and Class II/2 malocclusion, classified into three age groups. The following variables were measured on a laterolateral cephalometric radiograph: mandibular angle, height of the ramus and length of the mandibular corpus. The mandibular angle was smallest in the subjects with over bite (average 123°), largest in patients with open bite (average 135°) and in subjects with progeny it amounted to an average 130°. Statistically significant difference was found between the size of the mandibular angle and the type of anomaly (p<0.05). Statistically significant difference was determined between linear skeletal variables and age groups (p<0.05). With regard to the values of the height of the ramus and length of the mandibular corpus statistically significant difference was found between the first age group (6-12 years) and the third age group (16-18 years) (p<0.05). In the male subjects values for linear skeletal variables were higher than the same variables measured in female subjects, although the difference was not statistically significant.