Long-term retention of deep-bite Class II correction with semirigid fixed functional appliances

Orthodontic correction of Class II deep over-bite malocclusions is known to be difficult and prone to relapse. Class II correction may be accomplished by various methods; however, long-term retention of treatment results helps in establishing the efficacy and efficiency of a treatment modality. Semirigid fixed functional appliances are routinely used for Class II correction; however, the long-term retention evaluation is generally lacking. This article reports four Class II deep-bite cases treated with a semirigid fixed functional appliance and evaluated for long-term retention, a minimum of 4 years after orthodontic treatment.