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110466
The Periodontium
Descrição
bacalaureat Oral Physiology Mapa Mental sobre The Periodontium, criado por Caroline Oxford em 27-05-2013.
Sem etiquetas
oral physiology
oral physiology
bacalaureat
Mapa Mental por
Caroline Oxford
, atualizado more than 1 year ago
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Criado por
Caroline Oxford
quase 11 anos atrás
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Resumo de Recurso
The Periodontium
Cementum
Periodontal ligament
Develops from dental folicle
Foms shortly after root formation
Starts with conective tissue/collagen fringes, extending to cementum
Fibroblasts secrete collagen which remodel fringes
Fibers change as tooth errupts, then thicken
Narrows with age
Thin in non functional teeth
Functions: Attachment, proprioreceptor, shock absorber
Composed of
Cells; Fibroblasts, epithelial cells (malassez,) Undifferenciated mesenchymal cells, Cementoblasts, Macrophages
Ectracellular; Colagen, elastin (immature only), Ground substance (glycoprotein, glycolipids.)
Fibroblasts synthesis/degrade collagen for rapid turnover
Mesenchymal cells are source of new PDL cells
Oesteoblasts/Oesteoclasts line bone
Cementoblasts line cementum.No Cementoclasts unless resorbtion of deciduos
Collagen, types 1,3+7. Remodelled withe stress forces
5 principle types; Aveola crest, Horizontal, oblique, apical, inerridicular
They run from cementum-bone. Sharpeys fibres
Ground substance 70% water
Rich blood supply; main from superiour and inferiour alveolar arteries,More posteria and mandible, less ants and maxilla
4 types of nerve endings, mostly free, Nocirecptors+ mechanicreceptor
Alveolar Bone
Consists of spongsiosa, sandwiched between buccal and ligual cortical plates
Bone lining known as Bundle bone as attaches PDL bundles
Perforated by forimina for nerves, vessels, known as cribiform plate or Lamina Dura on x-ray (white lining)
Gingivae
Gingivae fibres, insert into lamina propria
Groups include; Dentogingival, Alveologingival, circular, dentoperioestial,transseptal
Dentogingival Junction
Gingival tissue to tooth
Epithelial and connective parts
Epithelial part
Statified, squamous epithelial cells
Junctional epithelial, attached to tooth surface, forms collar, non keratinised
Sulclar epithelial, lines sulcus, non-keratinised
Oral gingival is keratinised.
Junctional epithelial, Flattened cells, line tooth
attached by hemidesmosomes and have high rate of turmover
JE has pourous intercellular, can let through antigens, lined with immune cells.
Connective part
Different from other connective tissue orally, as contains immflamatory cells.
Monocytes continually migrate from vessels, through intercellular tissue, out to the sulcus
Col (interdental papilla,) identical to juntional epithelium
Decreases with age, due to constant low grade imflamatory- Gingival recession
Hyaline Layer
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