Cementoenamel Junction
Enumerate types of cementoenamel junctions and write their development.
Answer:
Types of the cementoenamel junction and its development:
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1. In approx. In 30% of cases, the cementum and enamel meet as a butt joint, forming a distinct cementoenamel junction at the cervical margin.
- This junction is a relatively sharp line
2. In about 10% of cases, enamel and cementum do not meet.
- This occurs when enamel epithelium in the cervical portion of the root is delayed in its separation from dentin.
- A zone of the root is formed which is devoid of cementum and is covered by reduced enamel epithelium.
- The exposure of root dentin at the cervical margin can lead to sensitivity, increased risk for root resorption, and root surface caries.
“Understanding the cementoenamel junction through FAQs: Anatomy, functions, and uses explained”
3. In approx. In 60% of cases, cementum overlaps enamel.
- This occurs when the enamel epithelium generates at its cervical end permitting connective tissue to come in direct contact with the enamel surface.
- When cementoblast comes in contact with enamel they produce a fibrillar cementum.
- If such fibrillar cementum remains in contact with connective tissue cells for a long enough time, fibrillar cementum may be deposited on its surface.
- Thus, the thickness of cementum that overlies enamel increases.
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