What results when a force is applied only to the crown of the tooth?

When a force is applied only to the crown of a tooth, the result is uncontrolled tipping. This occurs because the force is not uniformly distributed along the tooth's roots. Instead, it creates a moment around the center of resistance, which is typically located in the root area. As a result, the crown of the tooth will move in the direction of the applied force, but the root will not move as freely, leading to tipping at the crown's apex.

Uncontrolled tipping is characterized by a lack of precise control over the tooth movement, which can lead to undesirable effects and misalignment if not monitored properly. This contrasts with controlled tipping, where forces are applied in a way that minimizes displacement and better manages the movement of the tooth. In orthodontic treatment, understanding how different forces affect tooth movement is crucial for achieving desired dental alignment and occlusion.