| 21. | It consists of the cementum, periodontal ligaments, alveolar bone, and gingiva.
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| 22. | Cementum is only found below the gingival line.
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| 23. | This occurs because as the abfration lesions appear, dentine / cementum is exposed.
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| 24. | The mineralized portion may be bone, cementum-like, or dystrophic calcifications.
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| 25. | In vertebrates, bone, teeth, and cementum are the principal mineralized tissues.
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| 26. | Of these, cementum is the only one that is a part of a tooth.
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| 27. | Cementum similarly adapts to wear on the occlusal surfaces of the teeth by apical deposition.
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| 28. | Cementoblasts form the cementum of a tooth.
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| 29. | Cementum fills the V-shaped islet.
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| 30. | Odontocetes, such as the sperm whale, possess teeth with cementum cells overlying dentine cells.
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