🔹Enamel: It is the most radiopaque normal structure in human body which consists of 92% of minerals.
🔹Dentine: It is less radiopaque as compared to enamel, which contains 65% of mineral content. The line of demarcation between enamel and dentine is sharp and well-demarcated. In bicuspid and molar teeth, DEJ is usually in a straight line. In cuspid and incisor, DEJ assumes the general contour of the tooth.
🔹Cementum: It has the same radiopacity as that of dentine. It contains 50% of mineral content.
🔹Cervical burn-out: It is a radiolucent band at the neck of the teeth radiographically appearing as radiolucent areas of the mesial or distal surface of the neck of the tooth, cervical portion of the tooth and crest of the alveolar ridge.
🔹Pulp chamber: It is the radiolucent area in the crown of the teeth.
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