Uncontrolled Tipping (UT) is the motion created by a single force acting at a distance from the center of resistance (CR) of a tooth.

Remember:

The same is true for a single force acting on a tooth.

Recall that UT has two (2) components Ð translation and rotation.

Controlled Tipping (CT) is the motion of a tooth that has a force applied at a distance from the center of resistance (CR) and has a counterbalancing couple (CBC) to regulate the rotation of the tooth.

Remember:

The same is true for teeth.

CBC allows you to control tipping in three ways:

When CBC's moment < F's moment...

When CBC's moment = F's moment, translation results! For example...

When CBC's moment > F's moment...