root concavity

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root con·cav·i·ty

(rūt kŏn-kavi-tē)
Linear developmental depression in the root surface; commonly occur on the proximal surfaces of anterior and posterior teeth and the facial and lingual surfaces of molar teeth. In healthy patients, it is covered with alveolar bone and thus help to secure tooth in bone.
Medical Dictionary for the Dental Professions © Farlex 2012