Full slot labial - pretorqued Vs plain mandibular archwire with Forsus FRD appliance in Class II malocclusions -A clinical trial

Purpose The purpose of study was to evaluate the skeletal, dentoalveolar and soft tissue changes in patients treated with Forsus FRD (Fatigue Resistance Device) therapy with a full slot labial pretorqued mandibular archwire in Class II patients and compare it with the conventional Forsus therapy. Methods The total sample of 31 subjects were divided into three groups. G1 group with eleven (Forsus appliance therapy with eight- degrees labial pretorqued full slot 0.021′′ x 0.028′′ stainless steel archwire in mandible), G2 group with ten (Forsus appliance therapy with plain 0.021′′ x 0.025′′ stainless steel archwire in mandible) and GC group with ten (untreated control) were evaluated. The lateral cephalograms before placement of Forsus and six month or at end of Class II correction were analysed. Results The paired students t test revealed Class I molar relation, overjet and overbite correction were achieved in G1 and G2 subjects. There was no statistically significant difference in the lower incisor position in both the treatment groups. N to pt A and SNA values decreased in G1, while, Wits value decreased in G2. The Post Hoc test showed significant changes in incisors inclination, molar position, overjet between the treated groups and control group. Conclusion The full slot 0.021′′x 0.028′′ pretorqued archwire didn’t prevent tipping of the mandibular incisors, however, showed better distal positioning of pt A; and hence, can help reduce the maxillary prominence, buccal occlusion and overjet correction, thereby facilitating overall esthetics improvement.