periodontal ligament fibres Flashcards
what are the periodontal ligament fibres mainly composed of
type one and three collagen
what are the periodontal ligament fibres composed of
- type I collagen
- type 3 collagen
- elastin
- oxytalin
- elaunin
what is the function of oxytalan fibres
interface with the collagen bundles as support for the collagen bundles and blood vessel walls
what are the periodontal ligament fibres derived from
the dental follicle
what is gomphosis
the formation of the fibrous joint between cementum and alveolar bone with the periodontal ligament fibres
overarching function of the periodontal ligament fibres
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
what are the principle cells of the periodontal ligament fibres
fibroblasts
function of fibroblasts
synthesis and degradation of collagen fibres
what are the cells found in periodontal ligament fibres
fibroblasts
epithelial cells
undifferentiated cells
what are the epithelial cells found in the periodontal ligament
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
what are the undifferentiated cells in the periodontium
perivascular cells as they are located around the blood vessels, and they are the source of new cells of the periodontal ligament space
what are the two ligament fibre bundle types
principle fibre bundles and gingival ligaments
describe principle fibre bundles
these fibres originate from the cementum and insert into the alveolar bone
describe gingival ligament fibre bundles
these originate from the cementum or the alveolar bone and insert into the gingiva
where is the interradicular group of fibres
furcation regions
what is the function of alveolar crest fibres
retain the tooth in the socket
counter coronal thrust
resist lateral movement of the tooth
function of horizontal fibres
retain the tooth in the socket by countering coronal thrust
resist lateral movement of the tooth
function of oblique periodontal fibres
absorb the chewing forces on the tooth
what is junctional epithelium
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
describe free gingival fibres
arise from the surface of the cementum in the cervical region and pass into the free gingiva
describe attached gingival fibres
arise from the alveolar crest and pass into the attached gingiva
describe circular or circumferential fibres
continuous around the neck of the tooth and resist gingival displacement
describe alveolar crest fibres
originate from the cementum at the neck of the tooth and terminate in the alveolar crest
describe transseptal fibres
originate in the cervical region of each crown and extend to similar locations on the mesial and distal surfaces of each adjacent tooth
what are the gingival fibre group fibres
transseptal
attached gingival
free gingival
circumferential
what are the dentoalveolar fibre group fibres
apical
oblique
horizontal
alveolar crest
interradicular
function of transseptal
resist tooth separation mesially and distally
function of the attach gingival fibres
resist gingival displacement
function of free gingival fibres
resist gingival displacement
function of circumferential gingival fibres
resist gingival displacement
function of circumferential gingival fibres
resist gingival displacement
function of apical gingival fires
resist vertical forces
function of oblique fibres
resist vertical and intrusive forces
function of horizontal fibres
resist horizontal and tipping forces
function of alveolar crest fibres
resist vertical and intrusive forces
function of interradicular fibres
resist vertical and lateral movements
which fibres keep the teeth in alignment
the transseptal
