Transillumination can be a useful diagnostic tool for identifying cracked teeth. As the light passes through the enamel, a crack will diffract the light and make the crack visible.
In this case, tooth #19 has visible cracks on the lingual, buccal and disto-marginal ridge.
This may be an important tool to help you identify a cracked tooth. Accurate pulpal and periapical diagnostics are most important to determine if endodontic therapy is needed before a crown is placed.
Transillumination helps the patient to see the stresses that the tooth is under and realize the importance of coronal coverage.
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