Cephalometric evaluation of the effect of the Herbst appliance in the treatment of the mandibular retrognathism in the permanent dentition

Omar Gabriel da SILVA FILHO, Leopoldino CAPELOZZA FILHO, Karla Tonelli Bicalho CROSARA, Terumi Okada OZAWA

Aim: The purpose of the current cephalometric study was to investigate the effects induced by the Herbst appliance followed by fixed orthodontic Straight wire mechanics and Class I elastics to correct a Class II division 1 malocclusion with a mandibular deficiency in the permanent dentition. Material and Methods: Initial (mean age of 12 years and 10 months) and final (mean age of 14 years and 8 months) cephalometric radiographs of 12 boys and 6 girls were traced to measure 12 cephalometric measurements that represented the sagittal position of the apical bases, facial convexity, mandibular rotation and sagittal position of the upper and lower incisors. Mean treatment time was 22.5 months, with 9.8 months using the Herbst appliance and 13 months with the fixed orthodontic mechanics. Results and Conclusions: The results showed: 1) no influence in the maxilla; 2) mandibular advancement; 3) reduction on the facial convexity; 4) maintenance of the mandibular plane inclination; 5) dental compensation mainly in the lower incisors (buccal tipping). Therefore, even with the Herbst fixed appliance it is more predictable and easy to obtain dental compensation than skeletal remodelling in the orthopedic correction of the mandibular deficiency.

Keywords: Cephalometry. Herbst appliance. Angle Class I. Functional Orthopedics.

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