Infraction - diagnostic signs

Description	An incomplete fracture (crack) of the enamel without loss of tooth structure.
Visual signs	A visible fracture line on the surface of the tooth.
Percussion test	Not tender. If tenderness is observed evaluate the tooth for a possible luxation injury or a root fracture.
Mobility test	Normal mobility.
Sensibility pulp test	Usually positive. The test is important in assesing future risk of healing complications. A lack of response to the test at the initial examination indicates an increased risk of later pulp necrosis.
Radiographic findings	No radiographic abnormalities.
Radiographs recommended	A periapical view. No other radiographic view are needed unless other symptoms are present.

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.