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Alveolar Crest

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Dental Anatomy Dental Glossary

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Alveolar Crest

The alveolar crest is the most coronal portion of the alveolar bone — the thin, uppermost ridge of bone that borders the tooth socket on all sides. In a healthy dentition, it sits approximately 1 to 2 millimeters below the cementoenamel junction (CEJ), the landmark where root cementum meets the enamel crown.

Anatomy and Normal Appearance

The alveolar crest forms the rim of each individual tooth socket, or alveolus, and runs continuously along the dental arch. Between adjacent teeth, it takes the shape of an interdental septum — a bony peak that fills the space between roots. On the buccal and lingual aspects, it presents as a thinner plate of cortical bone. On radiographs, a healthy crest appears as a dense, sharp, continuous radiopaque line running roughly parallel to an imaginary line connecting the CEJs of neighboring teeth.

Clinical Significance

The height and integrity of the alveolar crest are among the most reliable indicators of periodontal health. When the supporting periodontium is compromised, bone resorption characteristically begins at the crest and progresses apically. Crestal bone level is therefore a primary criterion for staging and grading periodontal disease.

  • Horizontal bone loss: The crest drops evenly across adjacent teeth, commonly seen in generalized chronic periodontitis.
  • Vertical (angular) bone loss: The crest descends at an oblique angle alongside a single root, often creating an infrabony defect and a deepened periodontal pocket.
  • Radiographic threshold: A crest located more than 2 mm apical to the CEJ is considered evidence of pathologic bone loss.
  • Implant planning: Adequate crestal bone volume is essential for implant placement; deficient height or width often requires augmentation before or during surgery.
  • Orthodontic considerations: Tooth movement through thin cortical plates can accelerate crestal bone resorption, particularly with excessive tipping forces.

Relationship to the Periodontal Ligament

The alveolar crest fibers are one of the principal fiber groups of the periodontal ligament, running obliquely from the cervical cementum downward into the crestal bone. These fibers resist lateral and tipping forces on the tooth. Disruption of this fiber attachment — whether from bacterial infection, trauma, or systemic conditions — contributes to early and ongoing crestal bone loss.

Monitoring the alveolar crest with serial periapical and bitewing radiographs remains a cornerstone of periodontal risk assessment, helping clinicians detect subtle bone changes before they become clinically advanced.