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Root Resorption

    •        Histological illustration of varying degrees of repair in orthodontically induced root resorption in maxillary premolars after 1 to 8 weeks retention.
    • A.  Root surface in the cervical third ofthe root with normal dentin (d), acellular root cementum (c), and periodontal ligament (p).
    • B.  Undermined root resorption in the cervical third of the root. Dentin (d), cementum (c), periodontal ligament (p).
    • C.  Partial repair with acellular cementum (ac) in the cervical third of the root. Dentin (d).
  • Surface resistance – cementum is due to the innermost cellular layer of the periodontal ligament.
  • – protective mechanism
  •  -potential for repair
  • Cementoblasts
  • Fibroblasts
  • Osteoblasts
  • Endothelial
  • Perivascular cells

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