Alveolar Bone Quiz (ODS Learning Outcomes)

What is the correct order of the layers of alveolar bone from outermost to innermost?

Which of the following conditions indicates periodontitis based on the height of the cemento-enamel junction to alveolar bone crest?

What is the characteristic feature of a dehiscence defect in alveolar bone?

Which term describes the defect in the alveolar bone where part of the bone lamina covering the tooth root is lost?

How does osteoporosis affect the alveolar bone with age?

Alveolar Bone Structure and Function

Alveolar bone is composed of four layers: periosteum, dense compact bone, cancellous bone, and a cribriform plate lining the alveolar sockets.
Radiographically, the alveolar bone appears as a radiodense line called the lamina dura.
Functions of alveolar bone include support, protection, attachment through Sharpey's fibres, and shock absorption.

Features of Alveolar Bone in Health and Disease

Healthy: The distance between the cemento-enamel junction (CEJ) and the alveolar bone crest is typically 1-2 mm.
Disease (Periodontitis): In periodontitis, the distance between the CEJ and alveolar bone crest exceeds 3 mm.
Defects:
Dehiscence: Loss of alveolar bone on the facial aspect of a tooth, creating an oval, root-exposed defect from the CEJ apically.
Fenestration: A defect in the alveolar bone, where part of the bone covering a tooth root is lost.

Osteoporosis: Bone loss (reduced density).
Brittleness: Decreased water content in the bone.
Changes in Cancellous Bone: Thinning of trabeculae (support beams), and wider marrow spaces.

Radiographic Assessment in Periodontitis

Percentage of bone loss can be estimated radiographically.

This quiz covers the structure and function of alveolar bone, detailing its layers and radiographic appearance. It also explores features of alveolar bone in both healthy states and diseases like periodontitis, along with age-related changes. Test your knowledge of dental anatomy and pathology!