eburnitis

Increased density and hardness of dentin, which may occur after the dentin is exposed. [L. eburneus, of ivory, + G. -itis, inflammation]

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ebur·ni·tis (e″bər-niґtis) [L. eburnus of ivory + -itis] increased hardness and density of dentin, generally occurring in exposed dentin, which may also undergo gradual discoloration, to yellow, to brown, and eventually to black.