What is the goal of using intrusive forces in orthodontics?

The goal of using intrusive forces in orthodontics is to create an apical movement of the teeth. Intrusive forces are designed to pull teeth towards the alveolar bone, effectively moving them deeper into the bone. This is particularly important when addressing issues such as over-erupted teeth or to create space for other orthodontic movements. The movement encourages the root of the tooth to move apically while the crown is pushed occlusally, which can help achieve a desired occlusion and improve overall dental aesthetic and function.

In contrast, the other options focus on different orthodontic goals. Expanding the dental arch involves forces that move teeth laterally, promoting spacing improvements. Moving anterior teeth forward or aligning the midline of the arch focuses on different directional forces that do not involve the specific apical movement associated with intrusive force applications.