Tooth Mobility - Miller Classification

Class 0

• Normal (physiologic) movement when force is applied.

Class I

• Mobility greater than physiologic.

Class II

• Tooth can be moved up to 1mm or more in a lateral direction (buccolingual or mesiodistal).
• Inability to depress the tooth in a vertical direction (apicocoronal).

Class III

• Tooth can be moved 1mm or more in a lateral direction (buccolingual or mesiodistal).
• Ability to depress the tooth in a vertical direction (apicocoronal).

The AAP definition of tooth mobility is "The movement of a tooth in its socket resulting from an applied force".

References:

• J Periodontol; July 2001.
• Miller PD Jr. A classification of marginal tissue recession. Int J Perio Rest Dent 1985;5(2):9-13.