Periodontium

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Author:
svisperas
ID:
91732
Filename:
Periodontium
Updated:
2011-06-22 23:30:28
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Oral Biology
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Description:
Periodontium
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  1. What does the periodontium include?
    • Cementum
    • Periodontal Ligament
    • Alveolar Bone
  2. Periodontium
    Supporting hard amd soft dental tissues b/w and including portions of the tooth and alveolar bone
  3. Cementum
    • Covers the ENTIRE root
    • Thickest: Apex
    • Thinnest: CEJ
    • 65% mineralized
    • Resembles bone
    • From dental sac
    • After HERS
  4. Cell stages of Cementum
    • Undifferentiated cells become cementoblasts
    • Undergo cementogenesis
    • Become CEMENTOCYTES
  5. What TWO fibers come from the Fibrous Matrix?
    • Sharpey's
    • Intrinsic Nonperiodontal
  6. Sharpey's Fibers
    • Organized
    • 90 degree angle
  7. Intrinsic Nonperiodontal Fibers
    • Unorganized
    • Parallel
  8. CELLS in Cementum
    • Cementocytes
    • Lacunae
    • Canaliculi
  9. Cementocytes
    Entrapped cementoblasts
  10. Lacuna
    Small space that surrounds each cementocyte
  11. Canaliculi
    Lacuna Canals
  12. THREE patterns of the CEJ
    • Overlap
    • Meet
    • Gap
  13. TWO stages of Cementum Repair
    • Resorption
    • Repair of traumatic resorption
  14. Resorption
    (Cementum Repair)
    Removal of cementum by odontoclasts resulting in reversal lines (scalloped)
  15. Repair of traumatic resorption
    (Cementum Repair)
    Building of cementum by cementoblasts resulting in arrest lines
  16. Cementum Repair is from trauma due to:
    • Occlusal force
    • Ortho tooth movement
    • Shedding
    • Erurption
    • Does NOT remodel
  17. TWO types of Cementum
    • Acellular (Primary)
    • Cellular (Secondary)
  18. Acellular (Primary)
    • FIRST layers
    • No cementocytes
    • SLOW
    • Covers root & CERVICAL 1/3
    • Width never changes
    • Sharpey's are fully mineralized
  19. Cellular (Secondary)
    • LAST layer
    • Many cementocytes
    • FAST
    • Apical 1/3
    • Width can change
    • Sharpey's are partially mineralized
  20. Periodontal Ligament
    • From the dental sac
    • Connective tissue
  21. TWO types of nerves in the PDL
    • Afferent
    • Autonomic Sympathetic
  22. CELLS types in the PDL
    • Fibroblasts
    • Cementoblasts
    • OsteoBLASTS
    • OsteoCLASTS
    • Odontoclasts
    • Undifferentiated Mesenchymal
    • Epithelial Rests of Malassez
  23. Cementoblasts
    Form cementoid or cementum matrix
  24. Principal Fibers
    Within either cementum or alveolar bone are called SHARPEY'S fibers
  25. FIVE groups of the Alveodental Ligament
    • Alveolar Crest
    • Horizontal
    • Interradicular
    • Oblique
    • Apical
  26. What THREE alveodental ligaments resist tilting, intrusive, extrusive & rotational forces?
    • Alveolar Crest
    • Horizontal
    • Interradicular
  27. Interdental Ligament
    • Holds teeth in interproximal contact
    • No bone attachment
  28. What are the FOUR gingival fibers?
    • Circular
    • Dentogingival
    • Alveogingival
    • Dentoperiosteal

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