In primary occlusal trauma, how is mobility characterized?

In primary occlusal trauma, mobility is characterized by excessive forces that are applied to normal periodontal ligaments. This condition occurs when there is an increased functional load on a tooth that has a healthy periodontal attachment. The periodontal ligaments are responsible for maintaining the stability of the tooth in its socket, and when normal tissues are subjected to excessive occlusal forces, it can lead to an increase in tooth mobility.

This scenario does not typically involve pathological conditions like advanced gingivitis or root resorption, which usually contribute to mobility through different pathological processes. While orthodontic treatment can also affect tooth mobility, it does so through controlled forces applied to move teeth rather than causing trauma due to excessive forces on normal periodontium. Therefore, identifying excessive forces on normal periodontal ligaments as the cause of mobility provides a clear understanding of how primary occlusal trauma manifests in dental practice.