Periodontal Tissue Flashcards
Periodontium
tissue surrounding and supporting the teeth
what does the periodontium do
retains tooth in socket, resists masticatory loafs and acts as a defence barrier protecting the tissues against threat from oral environment
periodontal tissues are;
cementum, alveolar bone, gingiva, periodontal ligament
cementum
mineralised tissue covering entire root dentine, has collagen matrix and lamellar arrangement
what does the cementum do
provides attachment for some periodontal fibres
what is cementum laid down by
cementocytes
2 types of cementum
1 - acellular / extrinsic
2 - cellular / intrinsic
accelular / extrinsic cementum
no cells within, adjacent to dentine, first formed
collagen fibres from PDL - Sharpey’s
cervical 2/3 of root
cellular / intrinsic cementum
contains cementocytes, secondary formed
no sharpey’s fibres
present in apical root and furcation regions
no role in tooth attachment
alveolar bone
forms inner lining of tooth socket, attachment for periodontal ligament gibres [sharpey’s]
supports teeth, when lost = reabsorbed = residual ridge
periodontal ligament contains
connective tissue, matrix, cells, nerves
sensory nerves in PDL
mechanoreceptors [chewing], nociceptors [protective], autonomic
PDL blood supply
inferior and superior alveolar arteries, passing into PDL from alvrolar bone
lingual and palatine arteries supply gingivae
PDL function
attaches tooth to jaw, transmits biting forces to alveolar bone
periodontal fibres
true = connects tooth to bone
apical = alveolar crest
