Needle-free injection systems can contribute to the prevention of needle-related pain during palatal infiltration anesthesia (PIA) in children. Research with this topic on children is required.The purpose of this clinical study was to evaluate the effectiveness of the needle-free system versus traditional anesthesia on pain perception during PIA in children.The study was designed as a randomized, controlled cross-over clinical study with 48 children aged 6 to 12 years requiring dental treatment with PIA in bilateral maxillary primary molars. It has been revealed that the application of a needle-free system during PIA ensured a decrease in pain perception in children.

Inclusion Criteria:

• In need of treatment of right and left primary molar teeth of maxilla,
• Does not have any systemic disorder,
• High level of communication that can provide logical answers to the questions we ask
• With parental consent,
• Volunteers who want to participate in the research
• 6-12 years old patients who are compatible with routine dental treatments in the pediatric clinic

Exclusion Criteria:

• No need for treatment of right and left primary molar teeth of maxilla,
• Has a systemic condition
• Low level of communication that cannot provide reasonable answers to the questions we ask
• Without parental consent
• Do not want to participate voluntarily in the research
• Do not attend a check-in
• Patients not in the 6-12 age group