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Cementum (Introduction (3 forms of Arrangement (Cementum overlaps enamel…

- - - - Compensatory tooth eruption
      - Chronic periapical inflammation
      - Paget’s disease
  - - - Detachment of cemental fragments
      - Separation of cementum
      - Partial split within cementum along incremental line
  - - - Cemental resorption
      - Chronic periapical inflammation
      - Tooth replantation
      - Occlusal trauma
- - - - E.g. sialoprotein, fibronectin, osteopontin
- - - - First formed
      - Covers root adjacent to dentine
      - Developed slowly
      - Border with dentine not clearly demarcated
      - No cells, structureless
      - Absence of pre-cementum
      - Incremental lines of Salter close together , thin & even
    - - Later formed
      - Found in apical and interradicular area
      - Fast rate of development
      - Border with dentine clearly demarcated
      - Contains cementocytes
        
        Which are cementoblasts that become embedded in tissue
      - Pre-cementum layer present
  - - - OM derived from inserting fibres of the PDL
        
        Fibres continue from PDL into cementum in same direction as principal fibres (perpendicular to root surface)
    - - OM derived from cementoblasts
        
        Fibres parallel to root surface
  - - - First formed primary acellular cementum
      - Covers cervical 2/3 of root
      - Collagen from Sharpey’s Fibres perpendicular to root surface
      - Important for tooth attachment
      - Fibres generally well-mineralized
    - - Secondary cellular Cementum
      - Apical and interradicular area
      - Composed to cementocytes and intrinsic fibres parallel to root surface
      - No role in tooth attachment
        
        Role: Tooth adaptation and repair
    - - AEFC and CIFC in alternating layers
    - - Intrinsic fibres run between extrinsic fibres
      - Can be
        
        Acellular mixed fibre cementum
        
        Slow
        
        Cellular mixed fibre cementum
        
        Fast
    - - No collagen fibres
      - Thin acellular layer with well mineralized ground substance