The interface between dentine and irregular secondary dentine.
D000818:Animals; D003731:Dental Caries / Q000150:complications / Q000473:pathology; D003804:Dentin / Q000033:anatomy & histology*; D003809:Dentin, Secondary / Q000209:etiology / Q000473:pathology*; D000882:Haplorhini; D006801:Humans; D014072:Tooth Abrasion / Q000150:complications