How do odontoclasts differ from osteoclasts in the context of tooth eruption and shedding?

• A. Odontoclasts resorb bone, while osteoclasts resorb dental tissues.
• B. Odontoclasts resorb dental tissues (root dentin and deciduous roots) during eruption and shedding; osteoclasts resorb alveolar bone during eruption pathway formation.
• C. They are the same cells with identical functions.
• D. Odontoclasts only resorb enamel.

Answer: (B)

The key idea is that two different cell types handle resorption, each targeting a different tissue during eruption and shedding. Odontoclasts are specialized for breaking down dental tissues—primarily dentin and cementum of root surfaces, including the roots of deciduous teeth. This resorption drives the shedding of primary teeth as their roots are dissolved. Osteoclasts, on the other hand, resorb bone, especially the alveolar bone around the erupting tooth, to create the eruption pathway through the jaw.

So the best description is that odontoclasts resorb dental tissues (root dentin and deciduous roots) during eruption and shedding, while osteoclasts resorb the surrounding alveolar bone to form the eruption route. Enamel is not resorbed by odontoclasts under normal conditions, which reinforces the tissue-specific roles of these cells.