| 21. | Twenty dentin disks were cut from human extracted third molars.
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| 22. | Dentin is a mineralized connective tissue with an organic matrix of collagenous proteins.
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| 23. | As the enamel and dentin are destroyed, the cavity becomes more noticeable.
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| 24. | Newly secreted dentin is unmineralised and is called predentin.
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| 25. | Because of continuous deposition of dentin, the pulp becomes smaller with age.
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| 26. | At this time, the dentin is not mineralized.
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| 27. | SP is highly expressed in dental pulp and dentin.
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| 28. | Osteonectin is also detectable in osteoid, bone matrix proper, and dentin.
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| 29. | The formation of dentin is known as dentinogenesis.
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| 30. | Tertiary dentin is dentin formed as a reaction to external stimulation such as cavities.
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