American Board of Orthodontics (ABO) Practice Exam

The primary effect of the Forsus appliance, as noted in literature by Cacciatore, is that it restricts maxillary sagittal growth. This functional appliance is designed to stabilize the position of the upper jaw while applying forward orthopedic forces to the mandible. By restricting the forward growth of the maxilla, the Forsus appliance effectively addresses issues related to class II malocclusions.

The mechanism behind this restriction is that the appliance alters the relationship between the mandible and maxilla through a combination of anchorage and intermaxillary forces, which in turn contributes to better alignment and occlusion without allowing for excessive forward growth of the maxilla. This effect can lead to a more balanced facial profile and improve overall dental function.

In the context of orthodontic treatment, this controlled restriction is crucial for establishing proper occlusal relationships and achieving long-term stability.