Periodontium Flashcards
Function and definition of periodontium
- tissues surrounding tooth
- attach tooth to jaw
- transmit forces to alveolar bone
- protective against microbes
What cell lays dow cementum
Cementocytes
Types of cementum
Cellular intrinsic fibre cementum (secondary)
- has cementocytes
- present apex area and furcations
- no sharpey’s fibres (no role in tooth attachment)
Acellular extrinsic (primary)
- laid Down first
- no cells
- still at apex just slim and covered by cellular
- sharpey’s fibres present for attachment (more closely packed at bone)
- Name of bone inner lining of tooth socket in alveolar bone
- Name of canals penetrating
- Name of perforation for arteries
Cortical plate
Volkmann’s canals
Nutrient formina
What is a residual ridge
Due to bone resorption after a tooth removed, the flattened alveolar patch
Cells present in periodontal ligament
- fibroblasts
- cementoblasts
- osteoclasts and cemnetoclasts
- epithelial cells (cell debris of malassez)
- defence cells
What blood vessels supply the PDLs
Lingual and palatine arteries
Inferior and superior alveolar arteries
Types of fibres present in periodontal ligament
Type I and III collagen
Oxytalan
Principle fibre groups of PDL
Alveolar-dental
- Apical
- Oblique
- Horizontal
- Alveolar crest
Interdental
- transseptal fibres
Function and types of gingival ligament
- to support alveolar crest gingiva to hug tooth (in lamina propria)
- dento-gingival fibres
- alveo-gingival
- dento-periosteal
- circular
Describe the junctional epithelium of the gingiva
- at enamel level
- internal and external basal lamina on either side
- desmosomes attach cells and cells to lamina (thus enamel and gingiva)
Name of tissue present in interproximal gingiva
Interdental col
