Concussion - Diagnostic signs

Description	An injury to the tooth-supporting structures without increased mobility or displacement of the tooth, but with pain to percussion and without gingival bleeding. The diagnostic signs of concussion are transient. It is therefore not possible to diagnose concussion if the examination is done several days after injury.
Visual signs	Not displaced.
Percussion test	Tender to touch or tapping.
Mobility test	No increased mobility.
Pulp sensibility test	Not reliable in primary teeth. Inconsistent results.
Radiographic findings	No radiographic abnormalities. Normal periodontal space.
Radiographs recommended	An occlusal exposure is recommended in order to screen for possible signs of displacement or the presence of a root fracture. The radiograph can furthermore be used as a reference point in case of future complications.

Dental Trauma Guide 2010 - produced in cooperation with the Resource Centre for Rare Oral Diseases and Department of Oral and Maxillo-Facial Surgery
at the University Hospital of Copenhagen - Last edited the 07-01-2014.