Effect of a modified Herbst appliance on maxillofacial morphology

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We examined morphological and functional changes induced with the use of a modified Herbst appliance which is used to promote condylar cartilage growth, and thereby induce forward remodeling of the glenoid fossa. The study included 7 females between 18.0 to 20.6 years of age with an average of 18.8 years who had Angle Class II malocclusion and an ANB angle between 5.3 and 7.5 degrees with an average of 6.4 degrees. The treatment time with the appliance was 8 months. Lateral cephalometric radiographs and computed tomography im- ages were taken to evaluate morphological changes. Electromyographic activity of the masseter and temporalis muscles was recorded with surface electrodes.<br> Angle Class II treatment with a modified Herbst appliance was accompanied by both skeletal and dental changes. The results suggest that anteroinferior movement of the condyles in the glenoid fossa with Herbst treatment leads to a combination of condylar growth and glenoid fossa remodeling.

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