Treatment of class II malocclusion and ectopic maxillary canines: A case report

BACKGROUND This case report presents an innovative approach to managing a complex class II division 1 malocclusion with ectopic maxillary canines using a modified twin block (TB) appliance. The modification facilitated simultaneous skeletal correction and canine eruption, reducing treatment time and improving patient satisfaction. CASE SUMMARY A 14-year-old male presented with concerns about a retruded chin and spacing between teeth. Clinical and radiographic evaluation revealed a class II division 1 malocclusion on a moderate class II skeletal base, with palatally impacted maxillary canines. Treatment involved a modified Clark TB appliance designed with hooks to allow active traction of the canines, followed by comprehensive fixed orthodontics. Over 18 months, the patient achieved improved occlusion, corrected overjet and overbite, successful eruption of the impacted canines, and enhanced facial aesthetics. The final results showed significant dental and skeletal improvement without requiring surgical intervention. CONCLUSION A modified TB appliance can effectively manage class II malocclusion with impacted canines in growing patients. The modified approach combining functional mandibular advancement and active canine traction represents a less-documented clinical adaptation, offering a valuable, efficient alternative to traditional two-phase interventions.