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Cementum (Relationship to enamel @ cervical region (30% Meets enamel (butt…

- - - - Collagen fibrils derived from cementoblasts (hence intrinsic fibres) and these do not extend into PDL space
      - If alone –> repair tissue –> fills resorptive defects of the root mostly in apical area
      - Cementocytes in the matrix
      - Located in the apical third on its own or part of CMSC
    - - Mixture of alternation layers of AEFC (contributes 2 tooth anchorage) + CIFC (exerts adaptive f(x) to adjust tooth position to new requirements)
      - Formed after tooth eruption and a response to funx demands
      - Found on the apical 1 or 2/3 ds of roots and furcation area
      - The rate of apposition of CMSC is about 0.1-0.5µm/ day is < than that of bone
  - - - No cells or fibrillar collagen
      - Major component is GAGs
      - Presents in the CEJ area (either contin. with root cementum or as isolated patches over enamel)
      - No clinical relevance
    - - Contains non-collagenous proteins (sialoprotein and osteopontin)
      - Homogenous structure
      - Collagenous matrix consists of densely packed collagen fibres (that become Sharpey's fibres when AEFC is laid down)
      - Formed with the formation of root dentin
      - No cementocytes within matrix
      - extrinsic fibres means from PDL fibroblasts
      - Found in cervical and middle thirds of the root
      - When root development is 2/3 completed and tooth is about to enter its functional stage, cementum formation converse from AEFC to CMSC