HOSA Dental Terminology Practice

What does the Cemento Enamel Junction (CEJ) refer to?

1. Line between the enamel and dentin

2. Junction of the enamel of the crown and cementum of the root

3. Area where enamel meets the gum line

4. Surface layer of the dental pulp

The correct answer is: Junction of the enamel of the crown and cementum of the root

The Cemento Enamel Junction (CEJ) is a significant anatomical feature in dental anatomy, specifically referring to the interface where the enamel of the tooth crown meets the cementum of the tooth root. This junction is critical as it marks the transition between the two different types of hard tissue that make up the tooth. The enamel, which is the hard outer layer of the crown, is created primarily for protection against wear and decay, while cementum covers the root and assists in anchoring the tooth to the surrounding alveolar bone via periodontal ligaments. Understanding the CEJ is important not just for identifying tooth structure but also for recognizing potential issues in dental health, such as recession of the gums that might expose the root surface and lead to sensitivity or increased risk of decay. The CEJ can also serve as a reference point in dental procedures, assessments of periodontal health, and determining conditions such as cervical caries, which occur near this junction. The other options refer to different anatomical relationships or structures within the tooth but do not accurately describe the CEJ. For instance, the line between the enamel and dentin describes a different interface, while the area where enamel meets the gum line pertains more to the gingival margin rather than the junction of enamel and cement