What defines Class III tooth mobility?

Class III tooth mobility is characterized by more than 2mm of horizontal or vertical movement. This level of mobility indicates a significant loss of periodontal support and is often associated with advanced periodontal disease or severe trauma to the tooth. The presence of such mobility means that the tooth is not stable and likely has compromised supporting structures, making it both clinically significant and a concern for dental practitioners.

In contrast, lower levels of mobility, such as 1-2mm horizontal movement or 1mm vertical movement, reflect Class I or Class II mobility, which signifies less severe periodontal issues. No noticeable movement at all corresponds to a healthy tooth, indicating adequate periodontal support. Therefore, Class III mobility’s definition is essential for diagnosing and managing periodontal health, as well as for determining appropriate treatment options for affected teeth.