Embryology

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What did the periodontal ligament start out as?

the dental sac
Where is the periodontal ligament derived from?

the mesoderm
the fibrous connective tissue that attaches the tooth to the bone

periodontal ligament
how does the periodontal ligament appear on a radiograph?

a radiolucent area
What is the periodontal ligament referred to as on a radiograph?

periodontal space
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
What type of sensations can the periodontal disease detect? (4)
- pressure
- pain
- touch
- temperature
What type of tissue is the PDL?

connective tissue
true or false. There are nerves in the periodontal ligament or periodontal space

true
What are 5 components of the PDL?
- intercellular substance
- blood vessels
- nerves
- cells
- fibers
What do the blood vessels in the PDL supply nutrients to?
- alveolus
- cementum
- pulp of the tooth (once the vessels enter the apical foramen)
what type of nerves are in the PDL?

afferent sensory nerves
Name 4 types of cells found in the PDL
- fibroblasts
- osteoblasts/clasts
- cementoblasts/clasts
- epithelial rests of malassez
typical connective tissue cells found in the PDL

fibroblasts
cells in the PDL that are located along the periphery of alveolar bone they can build/destroy bone

osteoblasts/clasts
where are the osteoblasts and clast cells located?

along the periphery of cementum
cells in the PDL that are located along the periphery of cementum, and can build/destroy cementum

cementoblasts/clasts
Where are the cementoblasts and clasts located?

along the periphery of cementum
these cells started out as HERS, but got lost

epithelial rests of malassez
true or false. epithelial rests of malassez can be cystic

true
cells composed of bundles of fibers that connect the bone to the tooth with sharpey's fibers

fibers
What are 2 clinical considerations with the periodontal ligament?
- occlusal trauma
- periodontal disease
What are 2 examples of occlusal trauma that will put extra forces on the PDL?
- clenching
- grinding
What will the PDL do to help withstand forces from clenching or grinding?

it will widen
What happens to the fibers of the PDL in periodontal disease?

they get disorganized and lose their attachment
What causes the fibers in the periodontal ligament to get disorganized and lose their attachment in periodontal disease?

resorption of the bone and cementum

Author

sthomp88

50778

Card Set

Embryology

Description

periodontium 1

Updated

2010-12-06T07:03:22Z

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