Cephalometric-radiographic Comparative Study of Facial Growth Patterns according Evaluation of Sela and Goniac Angle of Jarabak´s Analysis, in Patients with Normal Occlusion and Angle´s Malocclusions

Carla SCANAVINI, Luis Antonio de Arruda AIDAR, Márcio LUPPI, Márcia MASI

The aim of this research was to give some contribution to the cephalometric – radiographic comparative study of facial growth patterns according evaluation of sela and goniac angle of Jarabak’s Analysis, in patients with Normal Occlusion and Angle’s malocclusion of Classe I, Class II, division 1, Class II, division 2, and Class III. The sampling consisted of 200 cephalometric telerradiographs, obtained from white Brazilian patients, whose Brazilian parents are descended from Mediterranean, in both sexes, not subjected to orthodontic treatment, showing permanent dentition, aged between 11 years and 2 months and 19 years and 10 months, students from schools located in São Paulo, ABC area (Santo André, São Bernardo do Campo e São Caetano do Sul) and Santos. This Sampling was divided, based on the occlusion type, into five groups, one consisting of patients who have normal occlusion and the other four of patients with malocclusions, according to Angle’s concepts (1899); these groups were equally divided in relation to the patient’s sex. After the analysis of the data and the applied statistics we came to the folowing conclusions: - Normal occlusion and Class II, division 2 groups, showed a smaller goniac angle, with more horizontal growth, square mandible and a tendency to deep byte; - In relation to goniac superior angle; Class I and Class II, division 2 groups showed tendency to a mandibular growth remaining, in a vertical direction, with less projection of chin, when comparing to normal occlusion and Class III malocclusion, that showed tendency to a mandibular growth remaining in a horizontal direction, with lower face more prognat; - Class I, Class II, division 1 and Class III groups, showed higher lower goniac angle, a more vertical mandibular plane , on the contrary, of Class II, division 2 malocclusion and normal occlusion groups that showed a smaller lower goniac angle, with tendency to a more horizontal inclination of lower border of mandible; - Even so inside deflection pattern, Class III groups showed a closed sela angle indicating a more vertical position of posterior base cranium, collaborating to a anterior projection of mandible; - Class II, division 1 and Class II, division 2 groups showed a discreet opening of sela angle, inside the deflection pattern; - Class I and normal occlusion groups showed sela angle values close to a normal rule.

Keywords: Cephalometric. Facial Growth Patterns. Goniac angle. Jarabak’s Analysis. Malocclusion. Sela angle.

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