What type of tooth movement occurs in the occlusal plane?

Tooth movement in the occlusal plane refers to the nature of the movement that occurs primarily within the horizontal dimension during orthodontic treatment. Translation is the correct answer because it describes the movement where the entire tooth is displaced in a linear direction without any change in its angulation.

In the occlusal plane, when a tooth is moved through translation, it shifts in such a way that its position changes without tilting or rotating. This is particularly essential in orthodontics for aligning teeth and achieving better occlusion. A tooth translated effectively maintains its root position relative to the crown, allowing for consistent force application and optimal stability.

Other types of movement, such as mesiodistal movement, involve more specific directional shifts, while rotation and uncontrolled tipping incorporate changes in the angle or tilt of the tooth. These movements can destabilize the tooth's position in relation to the dental arch, making translation the most appropriate term for describing the desired and controlled movement as defined in the context of orthodontic treatment in the occlusal plane.