the root canals of primary molars will be cleaned and shaped in pulpectomy treatment using the adaptive xp endo shaper. it is single file technique saves time and help with patient cooperation.

the root canals of primary molars will be cleaned and shaped in pulpectomy treatment using FANTA AF baby files. it is pediatric rotary system consists of 4 files specialized for primary molars.

the root canals of primary molars will be cleaned and shaped in pulpectomy treatment using hand k files. they are manual files, they are standard for root canal treatment (control group)

the patient will be anesthetized by local anesthesia. the rubber dam will be used for isolation. caries will be removed using high speed handpiece. determination of working length using apex locator. the canal patency will be checked with a # 10 K file, and gliding path until #15 K- file. the root canals of primary molars will be cleaned and shaped in pulpectomy treatment using the adaptive xp endo shaper. it is single file technique saves time and help with patient cooperation . the endomotor will be activated at aspeed of 800 rpm and 1 Ncm torque. the canals will be irrigated using 2.5% Nacol ending with 0.9% normal saline canal irrigation. the canals will be dried with paper points and obturated with Metapex. teeth will be restored by glass ionomer restoration than stainless steel crown.

Assessment of post-operative pain using Modified Wong-baker pain rating scale. It is 4-point scale measures pain as:

• Score zero - no pain.
• Score one - slight pain.
• Score two - moderate pain. Score three - severe pain. so ( score 0 is the best score & score 3 is the worst) These data will be recorded at intervals of 6, 12, 24, 72 hours, and one week. A telephonic communication will be done with the parents by the second assessor who will be blinded to the treatment protocol at 6, 12, 72 hours to assess the pain, and the patients will be given two appointments, first after 24 hours and the second after one week from the operating day. During both visits, the second assessor will collect the results of the pain assessment from the child's parent and will cross-check all the results to ensure that the reported values are consistent.