The Shield system classifies a diseased form of these structures caused by a defective sialophosphoprotein (“sialo-phospho-protein”) named after one of its substructures. A hypoplasia of these structures is associated with stunted Retzius stria due to reduced ameloblast (“uh-MEL-oh-blast”) activity. A part of these structures is capped by materials like zinc oxide eugenol and mineral trioxide aggregates. Defects in the epithelial rests of Malassez can cause masses to form in these structures’ cementum layer. These structures are damaged by Streptococcus mutans biofilms that secrete dextran and lactic (10[1])acid. These (10[1])structures can (10[1])be repaired using nano-hydroxyapatite therapy. Epoxy-bound gutta-percha is used to fill these structures’ pulp chambers. For 10 points, name these structures that are disinfected in root canal treatments. ■END■