The aim of this prospective, randomized, clinical trial was to evaluate the effect of the side-vented Max-i-Probe versus the end-vented NaviTip as endodontic needles during syringe irrigation on post-operative pain in adult patients with symptomatic irreversible pulpitis in posterior mandibular teeth.

The aim of this prospective, randomized, clinical trial was to evaluate the effect of the side-vented Max-i-Probe versus the end-vented NaviTip as endodontic needles during syringe irrigation on post-operative pain in adult patients with symptomatic irreversible pulpitis in posterior mandibular teeth. Medical and dental history was obtained from all participants in this trial and clinical examination for teeth was performed. Participants with symptomatic irreversible pulpitis were included. After access cavity preparation, participants were randomly assigned to one of the following groups: experimental group (Max-i-Probe) or control group (NaviTip). One-visit root canal treatment was performed . Each patient received a 48-h diary to record postoperative pain. Post-operative pain was measured at the following time points: 4, 12, 24 and 48 hours after root canal treatment.

Inclusion Criteria:

1. Age: 16-65 year old.
2. Medically free.
3. Mandibular posterior teeth with symptomatic irreversible pulpitis.
4. No sex predilection

Exclusion Criteria:

1. Pregnant females.
2. History of allergy to any medication used in the study.
3. Preoperative premedication less than 6 hours before procedure.
4. Cracked teeth and teeth with badly-decayed crowns.