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Periodontal Ligaments

Periodontal Ligaments. Introduction. ranges in width from 0.15 to 0.38 mm 0.21 at 11 to 16 years of age 0.18 at 32 to 52 years 0.15 mm at 51 to 67 years. Functions. Supporting the teeth in their sockets Acting as a sensory receptor. Development. Structure. Cells. Extracellular matrix.

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Periodontal Ligaments

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  1. Periodontal Ligaments

  2. Introduction • ranges in width from 0.15 to 0.38 mm • 0.21 at 11 to 16 years of age • 0.18 at 32 to 52 years • 0.15 mm at 51 to 67 years

  3. Functions • Supporting the teeth in their sockets • Acting as a sensory receptor

  4. Development

  5. Structure Cells Extracellular matrix Fibroblast Proteins Ground substance Glycosamino- glycan Epithelial cells Collagen fiber bundles Non collagenous protein Glycoproteins Undifferentiated Mesenchymal cells Glycolipids Cementoblasts and Osteoblast

  6. 1. Fibroblast

  7. Epithelial cell rests of malassez

  8. Undifferentiated mesenchymal cells • An important cellular constituent of the PDL

  9. Bone and Cementum cells

  10. Principal fiber bundles • Alveolar crest group • Horizontal group • Oblique group • Apical group • Interradicular group

  11. Elastic Fibers • There are 3 types of elastic fibers: • Elastin • Oxytalan • Elaunin

  12. Blood Supply • Well vascularized • Perforating arteries • More abundant in posterior than anterior, and in mandible than maxilla • More in gingival and apical third • Venous and lymphatic drain apically

  13. Nerve supply • More in apical area, except for upper incisors, where there is dense distribution in gingival and apical areas.

  14. Nerve Terminations • Free nerve endings (Nociceptor, mechanoreceptor) • Ruffini’s endings (mechanoreceptors) • Coil form • Encapsulated spindle type endings (mechanoreceptors) • Sympathetic Nerve supply

  15. Clinical Considerations

  16. END

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