The purpose of this study is to see how preoperative oral diclofenac sodium, piroxicam, and tramadol affects inferior alveolar nerve block efficacy during root canal treatment of mandibular molars with symptomatic irreversible pulpitis.

The proposed hypothesis is that the tested drug groups will improve the efficacy of inferior alveolar nerve block in comparison to the control group.

Standard Operating Procedure:

• A non-probability consecutive sampling was done in a dental out patient department and 120 patients were included and randomly divided in the 4 groups (n=30) using simple randomization as per the inclusion criteria.
• A verbal informed consent was taken from each participant before including them in a group.
• The study was designed to be a double blinded study, where the researchers and the patients both were unaware of the groups of drugs that were used; this anonymity was achieved by marking the groups A, B, C and D on boxes for drugs containing a placebo, diclofenac sodium, piroxicam, and tramadol respectively.
• The Heft Parker Visual Analogue Scale was used to assess the patients' pain levels prior to the drug ingestion, and the study was continued on the patients that reported moderate to severe pain on the Visual Analogue Scale. On this scale, the pain intensities were categorized as: no pain (0), mild pain (1-54 mm), moderate pain (55- 114 mm) and severe pain (> 114 mm).
• The patients were then given their respective group of drug/placebo. The patients were instructed to wait for 1 hour before they were administered Inferior Alveolar Nerve Block with 1.8 ml of 2% lidocaine with 1:100000 epinephrine using a non-aspirating syringe through a long needle of 27-Gauge.
• Standard root canal treatment was initiated after lip numbness was achieved, and pain levels were reassessed by Heft Parker Visual Analogue Scale during the root canal procedure. However, the patients who did not achieve the numbness of the lips were excluded from the study.
• Patients who reported discomfort and pain during the endodontic procedure were intervened appropriately; conversely, if the patient did not report any intraoperative pain, endodontic procedure was resumed.
• Till the end of the data collection process, the collected data forms were stored in a 4 different files labeled A ,B ,C and D respective to the drug groups. On completion of the collection process the data was added and stored as a data file into IBM SPSS Statistics version 25 and further analyzed.

Sample Size Estimation:

The study size was calculated with reference to previous reports, revealing that at least 30 individuals should be included as per the analysis of power of the study. The value of power used was 0.96, the effect size was taken as 0.4, and α was set as 0.05.

Statistical Analysis Plan:

Test of normality will be checked using one sample Shapiro Wilk. One-way ANOVA with Tukey's post-hoc will be employed if parametric test criteria is met; however if the parametric criteria is not fulfilled, the experimental groups will be compared using Kruskal-Wallis test with post-hoc analysis. The Chi-square test will be used to compare gender and drug groups against the Inferior Alveolar Nerve Block efficacy. These tests will be conducted on SPSS Statistics version 25.

Inclusion Criteria:

• Patients between the ages of 18 - 65 years.
• Patients with no medical or systemic conditions.
• Patients with prolonged pain response on cold pulp testing of 1st and 2nd mandibular molars.
• Patient with 1st and 2nd mandibular molars having symptomatic irreversible pulpitis with no periapical pathology or tenderness on percussion.
• Preoperative moderate to severe pain on heft parker visual analogue scale.
• Patients who can understand the recording of the pain using heft parker visual analogue scale.

Exclusion Criteria:

• Patients who are pregnant and/or breastfeeding.
• Patients with reported allergy to diclofenac sodium, piroxicam, and tramadol.
• Patients with periodontal pathologies, necrotized pulp, ankylosed or resorbed roots, open apex and non-restorable tooth.
• Patients who have taken an analgesic in the past 24 hours.

All collected IPD will be shared with the researchers who have received an ethical approval from their institution/organization through an email.

The data will be made available by November 2022 and will be available for 5 years till October 2027.

Researchers who have received an ethical approval from their institution/organization will be provided with the collected IPD.

The data will be sent through an email.

The study was designed to be a double blinded study, where the operators and the patients both were unaware of the groups of drugs that were used; this anonymity was achieved by marking the groups A, B, C and D on boxes for drugs containing a placebo, diclofenac sodium, piroxicam, and tramadol respectively.