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BDS2: Oral Biology > PDL > Flashcards

PDL Flashcards

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0
Q

What cells are present in the PDL?

A

Fibroblass, cementoblasts, osteoclasts, cementoclasts, epithelial cells, defence cells

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1
Q

What are the components of the periodontal ligament?

A

A connective tissue containing:

cells, ECM, fibres, nerves, blood vessels

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2
Q

What is the function of the PDL?

A

Attaches the tooth to jaw and therefore transmits biting forces to alveolar bone. It’s width is approx 0.2mm. It creates a space between the tooth and bone.

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3
Q

What are the two groups of periodontal fibres?

A

True periodontal ligament - fibres connecting tooth to bone at or apical to alveolar crest
Gingival ligament - fibres mainly above the alveolar crest, including ‘free gingival’ fibres

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4
Q

What are the principle fibre groups of the PDL?

A

Alveolodental ligament:
Alveolar crest, horizontal, oblique, apical, interradicular (multi-rooted teeth only)
Interdental ligament:
Transseptal fibres

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5
Q

What is the function of the alveolar crest ligament?

A

Resists horizontal movements

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6
Q

What is the function of the horizontal PDL fibre?

A

resists horizontal pressure against the crown

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7
Q

What is the function of the oblique PDL fibre?

A

Resists vertical pressure that could drive the tooth into it’s socket

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8
Q

What is the function of the apical PDL fibre?

A

Secures tooth in socket and resists forces that may lift it out of the socket or push it too far into the socket (compression).

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9
Q

What is the function of the interradicular PDL fibre?

A

Stabilises the tooth in socket

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10
Q

What is the function of the transeptal PDL fibre?

A

Keeps all the teeth aligned - connects different teeth together.
Does not have an osseous attachment.
Embedded in cementum.

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11
Q

What is the blood supply of the PDL?

A

Inferior & superior alveolar arteries passing into the PDL from alveolar bone.
From lingual & palatine arteries supplying gingivae.

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12
Q

What fibres are the PDL made up of?

A

Collagen (types I & II) - true PDL, support tooth/load bearing
Oxytalan fibres - function is uncertain
Elastic fibres - absent in humans but present in dogs

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13
Q

What is the gingival fibre group?

A

Fibres that support free gingiva. Present in the lamina propria in marginal gingiva.

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14
Q

What are the types of gingival fibres?

A

Dento-gingival (anchors onto tooth)
Alveolo-gingival (anchors onto bone)
Dento-periosteal (tooth to periosteum)
Circular (rope surrounding tooth)

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BDS2: Oral Biology (5 decks)

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