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Questions and Answers
What is the correct order of the layers of alveolar bone from outermost to innermost?
What is the correct order of the layers of alveolar bone from outermost to innermost?
- Cancellous bone, cribriform plate, dense compact bone, periosteum
- Cancellous bone, periosteum, cribriform plate, dense compact bone
- Periosteum, dense compact bone, cancellous bone, cribriform plate (correct)
- Dense compact bone, periosteum, cribriform plate, cancellous bone
Which of the following conditions indicates periodontitis based on the height of the cemento-enamel junction to alveolar bone crest?
Which of the following conditions indicates periodontitis based on the height of the cemento-enamel junction to alveolar bone crest?
- 1mm
- Exactly 4mm
- 3mm or more (correct)
- 2mm or less
What is the characteristic feature of a dehiscence defect in alveolar bone?
What is the characteristic feature of a dehiscence defect in alveolar bone?
- Formation of more compact bone around the tooth root
- Loss of bone density in the entire jaw
- An oval, root-exposed defect on the facial aspect of the tooth (correct)
- An increased thickness of the alveolar crest
Which term describes the defect in the alveolar bone where part of the bone lamina covering the tooth root is lost?
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?
How does osteoporosis affect the alveolar bone with age?
Flashcards
What is the periosteum?
What is the periosteum?
The outermost layer of alveolar bone that covers the outer surface. This layer is a sheath of connective tissue.
What is the function of the compact bone in alveolar bone?
What is the function of the compact bone in alveolar bone?
The dense outer layer of alveolar bone that provides strength and support to the teeth.
What is the lamina dura?
What is the lamina dura?
A thin, radiopaque line that appears on X-rays and represents the lining of the tooth socket. It's made of dense bone.
What is the cancellous bone's role in alveolar bone?
What is the cancellous bone's role in alveolar bone?
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What is a dehiscence?
What is a dehiscence?
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Study Notes
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.
Age-Related Changes in Alveolar Bone
- 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.
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