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 牙骨质龋(cementum caries):多发生于牙龈萎缩、根面暴露后,由于牙骨质生长线围绕牙根呈同心圆排列,导致病变围绕牙根向侧面扩展,与其他病变融合,因而形成环绕牙根的龋坏病变。Cementum caries :The cementum caries occur mostly after gingiral rece (共 415 字) [阅读本文] >>