这个词是什么意思？
A regressive change of teeth characterized by excessive development of secondary cementum on the tooth surface. It may occur on any part of the root, but the apical two-thirds are most commonly affected. (Dorland, 27th ed)
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D006936 · MeSH 2026。
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