When is atransillumination test used?

. examination of an. Organ, cavity, or tissue (for example, tooth or gingival tissue) by transmitted light. A valuable aid in detecting carious lesions, disclosing carious or demineralized dentin during cavity preparation, checking the finish or gingival margins of restorations, and revealing cement, debris, or calculus subgingivally.This were we used atransillumination.