Treatment of Mandibular Overjet in Children With Maxillary Retrognathism

The aims of this project on treatment of young patients with Cl III due to maxillary retrognathia are to: 1) compare timing and treatment approaches for orthodontic treatment between national clinics and between two Scandinavian countries, Sweden and Denmark; 2) compare the treatment effect immediately after treatment between various orthodontic treatment approaches; 3) compare the treatment effect and side effects as well as patient perspectives in the short and long term after treatment between different orthodontic treatment approaches; 4) analyse the significance of timing, treatment approaches, and craniofacial morphology for short- and long-term predictions, treatment effects and side effects in the orthodontic treatment.

The project is based upon a comparison of well-established treatment approaches for Cl III due to maxillary retrognathia. It will not introduce or test new treatment modalities, additional procedures or behavioural regulation in relation to normal clinical practice or the use of medical devices.

Relevance of the project The project may contribute to identifying which treatment approaches and timing are most effective for orthodontic treatment of Cl III due to maxillary retrognathia. The results are therefore important for the choice of treatment approach and prognosis for the individual patient, and socio-economically important as treatment of Cl III in a better way may be tailored the individual patient whereby treatment effect may be optimised.

Method The project involves a 10-year prospective longitudinal cohort multicentre study where orthodontic treatment and treatment effect is followed in children with Cl III due to maxillary retrognathia who undergo standardized orthodontic interceptive treatment. Standard clinical procedures are followed as usual at each clinic where standard diagnostic and follow up materials are taken before treatment, after treatment and follow ups after 5 and 10 years. The project will not introduce or test new treatment modalities, additional procedures or behavioural regulation in relation to normal clinical practice or new medical devices. The standard diagnostic and follow up materials in each clinic include examination of the dentition, occlusion, craniofacial morphology, and orofacial function. The analyses are based on the following standardized registration methods which are carried out on all the patients. Information from the patient record is included.

General registrations: