Describe the difference between an active force and a reactive force.

The distinction between active forces and reactive forces in orthodontics is fundamental to understanding tooth movement. Active forces are characterized by their intentional application to produce movement. When an orthodontic appliance, such as braces or aligners, is applied to the teeth, the forces exerted are purposefully designed to move the teeth into a desired position. This deliberate action is crucial for achieving the treatment goals in orthodontics.

In contrast, reactive forces typically arise as a response to the active forces applied to the teeth. They are not applied with the intent to create movement; instead, they can stabilize the teeth or respond to the forces generated by orthodontic devices. Understanding this interplay between active and reactive forces is essential for orthodontic mechanics, as it affects how treatments are planned and executed to manage the movement of teeth effectively.