Podcast
Questions and Answers
Which of the following groups of principal fibers is located around the necks of the teeth?
Which of the following groups of principal fibers is located around the necks of the teeth?
Which of the following fibers surrounds the roots of the teeth?
Which of the following fibers surrounds the roots of the teeth?
What is the term used for the space between each group of fibers in the periodontal ligament?
What is the term used for the space between each group of fibers in the periodontal ligament?
What does the interstitial space in the periodontal ligament contain?
What does the interstitial space in the periodontal ligament contain?
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Which of the following statements about the function of the interstitial space is correct?
Which of the following statements about the function of the interstitial space is correct?
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Which of the following fibers are small in diameter and appear to interface with the collagen bundles?
Which of the following fibers are small in diameter and appear to interface with the collagen bundles?
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Which of the following is the principal function of the periodontal ligament (PDL)?
Which of the following is the principal function of the periodontal ligament (PDL)?
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Which of the following fibers are embedded in the cementum matrix?
Which of the following fibers are embedded in the cementum matrix?
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What is the purpose of the interstitial space in the periodontal ligament?
What is the purpose of the interstitial space in the periodontal ligament?
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Which group of PDL fibers is responsible for the proprioceptive mechanism that allows us to feel forces applied to the teeth?
Which group of PDL fibers is responsible for the proprioceptive mechanism that allows us to feel forces applied to the teeth?
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Which of the following is NOT a function of the periodontal ligament?
Which of the following is NOT a function of the periodontal ligament?
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Which of the following statements about the organization of the periodontal ligament is correct?
Which of the following statements about the organization of the periodontal ligament is correct?
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What is the function of the periodontal ligament in relation to teeth?
What is the function of the periodontal ligament in relation to teeth?
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Which tissue does the periodontal ligament primarily develop from?
Which tissue does the periodontal ligament primarily develop from?
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What is the main cell type found in the periodontal ligament?
What is the main cell type found in the periodontal ligament?
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In radiographs, what is the appearance of the periodontal space within the periodontal ligament?
In radiographs, what is the appearance of the periodontal space within the periodontal ligament?
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Which of the following is NOT a cell type found in the periodontal ligament?
Which of the following is NOT a cell type found in the periodontal ligament?
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What is the role of osteoclasts in the periodontal ligament?
What is the role of osteoclasts in the periodontal ligament?
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Study Notes
Periodontal Ligament
- Attaches teeth to surrounding alveolar bone by way of cementum
- Covers the root of the tooth and connects with gingiva tissue
- Occupies the periodontal space and is composed of fibers, cells, and intercellular substance
- Develops from dental follicular tissue that surrounds the tooth
Composition
- Highly cellular, containing fibroblasts, vascular, neural, bone, and cemental cells
- Interstitial spaces contain blood vessels, nerve trunks, and communicate freely with vessels and nerves at the apex of the roots and alveolar bone
Radiographic Appearance
- Appears as a radiolucent area (dark) on radiographs, between the radiopaque (light) lamina dura of the alveolar bone proper and the radiopaque (light) cementum
Cells
- Fibroblast is the most common cell in the PDL
- Also contains cells not found in other connective tissues, such as cementoblasts, osteoblasts, osteoclasts, odontoclasts, and epithelial rests of Malassez
Organization
- Two groups of principal fibers: gingival group and dentoalveolar/alveolodental group
- Gingival group is located around the necks of the teeth, while dentoalveolar/alveolodental group surrounds the roots of the teeth
- Four groups of gingival fibers: dentogingival, alveologingival, circular, and dentoperiosteal fibers
Interstitial Space
- Contains a network of blood vessels, nerves, and lymphatics that maintain the vitality of the periodontal ligament
- Supports the dense collagen fiber bundles and allows for constant stretching and contraction of the fiber bundles during mastication
Functions
- Maintains the gingiva in proper relationship to the teeth
- Transmits occlusal forces from the teeth to the bone, allowing for a small amount of movement and acting as a shock absorber
- Serves as the periosteum for the cementum and alveolar bone
- Cells in the PDL participate in the formation and resorption of the hard tissues of the periodontium
- Provides nutrition for the cells of the ligament and surrounding cells of the cementum and alveolar bone
- Has a nerve supply that provides a proprioceptive mechanism, allowing for the sensation of even the most delicate forces applied to the teeth and any displacement of the teeth
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Description
Learn about the periodontal ligament, which attaches teeth to the alveolar bone via cementum. Understand its composition, development, and connection with gingival tissue. Explore the role of blood vessels and nerve trunks within the periodontal ligament.
