Retrognathic Mandible

Facial scans of the patients eligible for the functional appliance treatment (Twin Block appliance) will be taken prior to and after the end of treatment. Also, a facial scan of the predicted final outcome will be taken, and compared to the actual final outcome. Parents / caregivers will fill out the Pediatric Sleep Questionnaire (PSQ) prior to and upon the end of treatment to asses perceived influence on sleep related breathing problems in their children.