Özet:
The aim of this case report presents a case of skeletal II and dental Class II treated with functional
appliance in a male patient with increased openbite. A 9-year-old male patient was admitted to
our clinic with gaping of anterior teeth. Clinical and radiographic evaluation revealed skeletal
class II and dental class II anomaly and increased openbite due to mandibular retrognathia. The
treatment was started with rapid maxillary expansion. After the retention period of 6 months, the
treatment was continued with activator appliance to correct mandibular retrognathia. Mandibular
advancement and class I molar and canine relationship were achieved after 10 months of activator
use. In conclusion, in the case of dental class II, increased overjet, rapid maxillary expansion and
functional treatment with activator appliance resulted in a good occlusion with normal overbite
and overjet with dental class I relationships
