IRCT20130812014333N190 IRCT 2022-12-09 Esfahan University of Medical Sciences Comparison the effect of Sodium fluoride in reducing root sensitivity after surgery Comparison the effect of Sodium fluoride in the form of hydrogel in reducing root sensitivity after periodontal flap surgery 2023-01-05 anticipated 36 Complete https://irct.ir/trial/67199 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: Using a simple random method. Numbers 1 to 36 are written on 36 cards. The 12 numbers that are randomly selected in the first stage are assigned to the first group. The 12 numbers that are randomly selected in the second stage are assigned to the second group, and the 12 numbers that are randomly selected in the third stage are assigned to the third group, Blinding description: Patients are informed about participating in the study and receiving the new drug, but the clinical caregiver and the participant will be kept blind to what type of drug each group will receive. Medicines can only be identified through the serial number on the container. The serials are with the main researcher and will remain confidential until the end of the study. N/A Flap surgery. Intervention 1: In the first intervention group, a small brush is dipped in sodium fluoride solution and used on the buccal surfaces of the root, then sutured. Intervention 2: In the second intervention group, 3 cc of hydrogel form in the form of pluronic acid f127 to provide mechanical properties and easy exit from the syringe at 37 degrees, and Kropel p 934 to create a hydrogen bond with the tooth and sodium fluoride were used before suturing. Intervention 3: . In the third intervention group, before suturing, a small brush is immersed in normal saline solution and used on the buccal surfaces of the roots. No - There is not a plan to make this available Justification or reason for not sharing IPD is There is no further information