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In apical areas of Groups I and II, inflammatory alterations of the pulp were observed, such as the presence of mononuclear inflammatory cells, odontoclasts in resorption lacunae on the inner surface (Figure 1B) and variations in the odonto-blast layer that shows disorganization.
Odontoclasts are cells that occur normally (they are responsible for breaking down the roots of baby teeth to allow them to fall out), but we don't know why they sometimes go haywire.
Bone and RR in both physiologic and pathologic instances involves a coordinated interaction among osteoblasts and osteoclasts as well as odontoblasts and odontoclasts that are regulated by the OPG/RANK/RANKL system (28) (Fig.
Those events consequently led to the recruitment of active odontoclasts, which promotes the beginning of the RR process (30).
Kido et al., "Expression of cathepsin K mRNA and protein in odontoclasts after experimental tooth movement in the mouse maxilla by in situ hybridization and immunoelectron microscopy," Cell and Tissue Research, vol.
Takano-Yamamoto, "Expression of osteopontin mRNA in odontoclasts revealed by in situ hybridization during experimental tooth movement in mice," Journal of Bone and Mineral Metabolism, vol.
Okabe, "Calcitonin in human odontoclasts regulates root resorption activity via protein kinase A," Journal of Bone and Mineral Metabolism, vol.
These modifications may occur because, during this period, dentin and pulp are eliminated by odontoclasts. This condition may suggest that primary teeth in different phases of their vital cycle could have different dentin characteristics.