IRCT20180519039722N1 IRCT 2018-07-08 Islamic Azad University Effect of pre-cooling injection site on pain perception Comparison of efficacy of Pre-Cooling and Topical Anesthetic Gel on the pain perception of pediatric patients during palatal injection 2018-06-13 anticipated 28 Complete https://irct.ir/trial/31297 interventional Randomization: Not randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Blinding description: It should be noted that the samples are divided into two groups, in half of them, the first injection after the use of the topical anesthetic gel and the second injection after pre-cooling, and in the second group, vice versa. The anesthetic injection is performed by the first practitioner (pediatric dentist) who is only aware of the treatment group of the study. Then, second actors (pediatric dentistry and dentistry student) who are blind to the surface anesthesia selected during the study, will examine the child's behavior when injected with SEM scale (sound, eye and motor). And match the resulting data. At the end of each of the injections, the child is asked to rate the amount of pain felt on the Wonge-Baker scale. N/A Correlation of Pre-Cooling and Topical Anesthetic Gel on the pain perception of pediatric patients during palatal injection. Intervention 1: Control group: In half of the specimens, the injection is made after placing the impregnated cotton gel, prime gel (Banzocaine 20%) of the prime Dental Company of the United States for 1 minute in the anesthetic region. Intervention 2: Intervention group: In half of the samples, freezing of the carpool (which will be prepared by emptying the lidocaine cartridge and filling it with water and placing it in the freezer), will be used for 1 minute before injection. No - There is not a plan to make this available Justification or reason for not sharing IPD is Will be announced at the end of the study.