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a loss of tooth structure originating within the pulp cavity.
Farlex Partner Medical Dictionary © Farlex 2012
in·ter·nal re·sorp·tion(in-tĕrnăl rē-sōrpshŭn)
Regressive alteration of tooth structure that occurs within the crown or root of a tooth.
Medical Dictionary for the Dental Professions © Farlex 2012