2.5.2. Allocation Concealment
The current RCT was a double-blind trial in which both the operator and the patients were blinded to the randomized intervention that was administered. Allocation concealment, intervention preparation, and randomization were performed by an independent individual before the onset of the RCT. The investigators were blinded to the group of trial participants by securing assignment order in an opaque secured envelope. The preparation of intervention was carried out by dividing the local anesthetic medication cartridges (LAMC) into 152 (76 for each group) opaque sealed envelopes that were labeled with alphabetical symbols (A, B). Each envelope contained the LAMC, and the label of the cartridge was concealed by an opaque tap with alphabetical symbols (A or B) written on it. All LAMCs were packaged and labeled by the Septodont company and were acquired at the same time.