Strengths and limitations of this study
pain
INFILTRATION
As strengths, the present study used randomization and uniform application sites, insertion layer, needle gauge, and patient conditions to investigate whether a compression disk with projections may reduce pain intensity during intradermal infiltration anesthesia. Our results supported compression disk use.This study has certain limitations. The study was conducted at a single center with a relatively small patient sample. Furthermore, a placebo group was not included because former related studies had designated the flat side of the disk as a placebo intervention [In conclusion, this prospective randomized study showed that a 3D-printed UV-curable resin-compressing disk may relieve needle insertion and injection pain for axillary intradermal needle puncture during intradermal lidocaine injection. This is a safe, convenient, and effective physical analgesic method prior to nerve block anesthesia.