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pre·den·tin -'dent-ən or pre·den·tine -'den-.tēn, -den-' n immature uncalcified dentin consisting chiefly of fibrils
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pre·den·tin (pre-denґtin) the soft fibrillar substance composing the primitive dentin and forming the inner layer of the circumpulpar dentin; called also dentinoid.Medical dictionary. 2011.