Evaluation of the effects of skeletal anchoraged Forsus FRD using miniplates inserted on mandibular symphysis: A new approach for the treatment of Class II malocclusion. Class II malocclusion affects approximately one-third of the patients seeking orthodontic treatment. Patients with Class II malocclusions can exhibit maxillary protrusion, mandibular retrusion, or both, together with abnormal dental relationships and profile discrepancy. According to McNamara, mandibular retrusion is the most common characteristic of this malocclusion.
Although previously published studies proved the efficiency of fixed functional appliances, they also reported that protrusion of the mandibular incisors was a common finding. This unfavorable effect limits the skeletal effects of the fixed appliance. To overcome this problem, Aslan et al. used a Forsus FRD (forsus fatigue resistance device) appliance combined with a miniscrew. The authors reported that the mandibular incisors protruded insignificantly (approximately 3.5°), and the overjet and molar corrections were totally dentoalveolar, confirming that the appliance was not successful for the skeletal improvements. Recently, Celikoglu et al. published a case report showing the treatment of a skeletal Class II malocclusion due to mandibular retrusion using a Forsus FRD appliance with miniplate anchorage inserted on the mandibular symphysis. The authors reported that this new approach was effective for correcting Class II malocclusion without mandibular incisor protrusion and with the skeletal contributions.
In the present study, miniplates were inserted on the mandibular symphysis for the application of Forsus FRD in order to eliminate mandibular incisor protrusion & to increase the skeletal contributions to the treatment findings. The patients included in the present study had skeletal Class II malocclusion due to the mandibular retrusion with normal vertical growth pattern. Dentoalveolar changes from the present approach were distalization of maxillary molars and retrusion of the maxillary and mandibular incisors. These dentoalveolar changes, combined with skeletal contributions, caused a significant correction in the overjet