The class II/1 anomaly of hereditary etiology vs. thumb-sucking etiology

The etiology of class II division 1 Angle anomaly comprises many entities, including heredity and the vicious habit of sucking the finger. A close connection between the etiology and the clinical features needs to be outlined, in order to have a more appropriate treatment approach.

This study aims to find common clinical features for two groups of Class II division 1 etiological factors (heredity and the vicious habit of sucking the finger), outlining a characteristic dento-facial pattern for each etiological factor.

160 orthodontic cases were studied, taken randomly from the Department of Orthodontics in "Carol Davila" University of Medicine and Pharmacy, between 2005 and 2011. From a total of 46 diagnosed with Class II/1, the following data were noted for each subject in a table: age, sex, etiology, facial symmetry, profile, size of the lower face, stage lip, labiomentonier ditch, menton, form of arches, palate, occlusion in the three plans, Spee curve, other dental anomalies.

The facial asymmetry was found in a greater proportion within the finger-sucking group. Subjects in the finger sucking group have 100% pronounced convex profile, with pronounced lip stage and sharp curve of Spee, being known that the thumb-sucking stops the mandible growth and stimulates the upper jaw protrusion.

The predominant etiological factor is heredity and the clinical features obvious for II/1 Angle anomaly are present in the highest proportion in the thumb-sucking group, but no significant differences were observed between the groups studied according to etiology.