Jara Castro, Marisa, et al. “Dentinal Microcracks Formation in the Root Canal in Chemical Mechanical Preparation With Protaper Universal, Protaper Next and Twisted File Adaptive”. Odontología Sanmarquina, vol. 19, no. 2, Dec. 2016, pp. 26-28, https://doi.org/10.15381/os.v19i2.12914.