Inclusion Criteria:  Posterior mandibular molars No previous root canal therapy on the tooth in question Able to complete the endodontic treatment in one visit  Exclusion Criteria:  Maxillary teeth, mandibular anteriors and premolars Infection (swelling, sinus tract) on the tooth in question Periodontal disease on the tooth in question Dental trauma Crown/ root fractures Systemic diseases Immunocompromised patients