We understand that it is inconvenient and technique sensitive. OrthoMTA is basically canal grafting material. Filling and grafting’s initial step and final outcome are both different and so the technique and procedure. If you consider the outcome of the tooth after several years which leads to extraction of the tooth and the patient-dentist relationship, the answer above is the clear answer to your question. Obturating the canal with watery-type-like sealer and lentulo spiral is neither grafting nor filling. Do not do this.