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sthomp88
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What did the periodontal ligament start out as?
the dental sac
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Where is the periodontal ligament derived from?
the mesoderm
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the fibrous connective tissue that attaches the tooth to the bone
periodontal ligament
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how does the periodontal ligament appear on a radiograph?
a radiolucent area
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What is the periodontal ligament referred to as on a radiograph?
periodontal space
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Why do we know how hard to bite on things?
because the periodontal ligament transmits occlusal surfaces, and it feels if we bite too hard
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What type of sensations can the periodontal disease detect? (4)
- pressure
- pain
- touch
- temperature
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What type of tissue is the PDL?
connective tissue
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true or false. There are nerves in the periodontal ligament or periodontal space
true
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What are 5 components of the PDL?
- intercellular substance
- blood vessels
- nerves
- cells
- fibers
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What do the blood vessels in the PDL supply nutrients to?
- alveolus
- cementum
- pulp of the tooth (once the vessels enter the apical foramen)
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what type of nerves are in the PDL?
afferent sensory nerves
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Name 4 types of cells found in the PDL
- fibroblasts
- osteoblasts/clasts
- cementoblasts/clasts
- epithelial rests of malassez
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typical connective tissue cells found in the PDL
fibroblasts
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cells in the PDL that are located along the periphery of alveolar bone they can build/destroy bone
osteoblasts/clasts
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where are the osteoblasts and clast cells located?
along the periphery of cementum
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cells in the PDL that are located along the periphery of cementum, and can build/destroy cementum
cementoblasts/clasts
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Where are the cementoblasts and clasts located?
along the periphery of cementum
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these cells started out as HERS, but got lost
epithelial rests of malassez
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true or false. epithelial rests of malassez can be cystic
true
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cells composed of bundles of fibers that connect the bone to the tooth with sharpey's fibers
fibers
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What are 2 clinical considerations with the periodontal ligament?
- occlusal trauma
- periodontal disease
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What are 2 examples of occlusal trauma that will put extra forces on the PDL?
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What will the PDL do to help withstand forces from clenching or grinding?
it will widen
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What happens to the fibers of the PDL in periodontal disease?
they get disorganized and lose their attachment
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What causes the fibers in the periodontal ligament to get disorganized and lose their attachment in periodontal disease?
resorption of the bone and cementum
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