Randomization and grouping
Patients were randomly assigned to two groups, 30 each, with 1:1 allocation ratio using computer-generated random numbers. The numbers were concealed in sealed 60 opaque envelopes. Either 30 ml of local anesthetic or 20 ml of local anesthetic was written inside each envelope as the volume for each participant. A blinded anesthetist (an anesthetist who did not participate in the study or data collection) used random numbers to assign patients to their groups. Then the procedure was explained to the patient whether 30 ml of local anesthetic or 20 ml of local anesthetic was performed to him/her. Group I included those to receive 30 ml of local anesthetic and group II was to receive 20 ml of local anesthetic.