A retrospective classification of tooth injuries using a new scoring system.

The WHO classification presently in use categories dental trauma only according to the main injury. A new scoring system will now enable more precise and complete diagnosis of tooth injuries. In an initial retrospective investigation, 100 traumatised teeth were classified according to the WHO and the new scoring systems. Clinical and radiological examinations and another evaluations using the new scoring system were made at the time of follow-up examination. Avulsion, intrusion, and root fractures (score < 30) showed the most unfavourable findings at the time of the accident. In comparison, the most favourable findings were shown by concussion and first degree crown fracture (score > 70). A comparison to the WHO classification occasionally revealed noticeable score variations within a single WHO type of injury. Generally, a strong interdependence was observed between the evaluations at the time of the accident and at the time of the follow-up examination (P < 0.001). If the score at the time of the accident was equal to or larger than 57, a successful therapy was usually ensured (P < 0.001). The new scoring system enables more complete diagnosis as well as permitting statements to be made concerning prognosis.