@article{KrugOrtmannReichetal.2022,
  author    = {Ralf Krug and C. Ortmann and S. Reich and B. Hahn and G. Krastl and S. Soliman},
  title     = {Tooth discoloration induced by apical plugs with hydraulic calcium silicate-based cements in teeth with open apices-a 2-year in vitro study},
  journal   = {Clinical Oral Investigations},
  volume    = {26},
  number    = {1},
  doi       = {10.1007/s00784-021-04009-0},
  year      = {2022},
}