<prompt> Name the injury seen in the colour plate:Crown fractureEnamel infractionCrown fracture without pulp exposureNone  <response>: A crack line or chip of the enamel is the key clinical feature of enamel infarction.ENAMEL INFARCTIONCLINICAL FINDINGS: Visual examination by DYES Methylene Blue. Tooth is not tender on percussion. If tender on percussion, check for luxation injuryroot fracture.TREATMENT: Etching and sealing with resin to prevent discoloration of infarction line. 