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periodontal ligament fibres Flashcards

1
Q

what are the periodontal ligament fibres mainly composed of

A

type one and three collagen

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2
Q

what are the periodontal ligament fibres composed of

A
  • type I collagen
  • type 3 collagen
  • elastin
  • oxytalin
  • elaunin
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3
Q

what is the function of oxytalan fibres

A

interface with the collagen bundles as support for the collagen bundles and blood vessel walls

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4
Q

what are the periodontal ligament fibres derived from

A

the dental follicle

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5
Q

what is gomphosis

A

the formation of the fibrous joint between cementum and alveolar bone with the periodontal ligament fibres

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6
Q

overarching function of the periodontal ligament fibres

A

support the tooth in the socket and keep the gingival tissues in their proper relationship with teeth and the alveolar bone
shock absorber to withstand and absorb the impact of masticatory forces

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7
Q

what are the principle cells of the periodontal ligament fibres

A

fibroblasts

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8
Q

function of fibroblasts

A

synthesis and degradation of collagen fibres

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9
Q

what are the cells found in periodontal ligament fibres

A

fibroblasts
epithelial cells
undifferentiated cells

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10
Q

what are the epithelial cells found in the periodontal ligament

A

remnants of hertwigs epithelial root sheath, which are present close to the cementum and form in clusters or strands, and they have a role in the repair and regneration of the periodontium

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11
Q

what are the undifferentiated cells in the periodontium

A

perivascular cells as they are located around the blood vessels, and they are the source of new cells of the periodontal ligament space

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12
Q

what are the two ligament fibre bundle types

A

principle fibre bundles and gingival ligaments

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13
Q

describe principle fibre bundles

A

these fibres originate from the cementum and insert into the alveolar bone

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14
Q

describe gingival ligament fibre bundles

A

these originate from the cementum or the alveolar bone and insert into the gingiva

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15
Q

where is the interradicular group of fibres

A

furcation regions

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16
Q

what is the function of alveolar crest fibres

A

retain the tooth in the socket
counter coronal thrust
resist lateral movement of the tooth

17
Q

function of horizontal fibres

A

retain the tooth in the socket by countering coronal thrust
resist lateral movement of the tooth

18
Q

function of oblique periodontal fibres

A

absorb the chewing forces on the tooth

19
Q

what is junctional epithelium

A

the epithelial component that is directly attached to a tooth surface and has a protective function against periodontal disease. acts as a barrier between the external environment and periodontal connective tissue for antimicrobial defence

20
Q

describe free gingival fibres

A

arise from the surface of the cementum in the cervical region and pass into the free gingiva

21
Q

describe attached gingival fibres

A

arise from the alveolar crest and pass into the attached gingiva

22
Q

describe circular or circumferential fibres

A

continuous around the neck of the tooth and resist gingival displacement

23
Q

describe alveolar crest fibres

A

originate from the cementum at the neck of the tooth and terminate in the alveolar crest

24
Q

describe transseptal fibres

A

originate in the cervical region of each crown and extend to similar locations on the mesial and distal surfaces of each adjacent tooth

25
Q

what are the gingival fibre group fibres

A

transseptal
attached gingival
free gingival
circumferential

26
Q

what are the dentoalveolar fibre group fibres

A

apical
oblique
horizontal
alveolar crest
interradicular

27
Q

function of transseptal

A

resist tooth separation mesially and distally

28
Q

function of the attach gingival fibres

A

resist gingival displacement

29
Q

function of free gingival fibres

A

resist gingival displacement

30
Q

function of circumferential gingival fibres

A

resist gingival displacement

31
Q

function of circumferential gingival fibres

A

resist gingival displacement

32
Q

function of apical gingival fires

A

resist vertical forces

33
Q

function of oblique fibres

A

resist vertical and intrusive forces

34
Q

function of horizontal fibres

A

resist horizontal and tipping forces

35
Q

function of alveolar crest fibres

A

resist vertical and intrusive forces

36
Q

function of interradicular fibres

A

resist vertical and lateral movements

37
Q

which fibres keep the teeth in alignment

A

the transseptal

revision (48 decks)

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