 Epithelial cell rests of Malassez

In dentistry, the epithelial cell rests of Malassez (ERM) or epithelial rests of Malassez ("pax epithelialis pediodontii") are part of the periodontal ligament cells around a tooth.They are discrete clusters of residual cells from Hertwig's epithelial root sheath (HERS) that didn't completely disappear.