The goal of this clinical trial is to evaluate and compare the efficacy of Kedo-Nano Plus rotary files, Kedo-S Square rotary files, and manual K-files for biomechanical preparation during pulpectomy of primary mandibular molars in children aged 5-8 years.
The main questions it aims to answer are:
* Does the use of Kedo-Nano Plus and Kedo-S Square rotary file systems result in better obturation quality compared with manual K-files during pulpectomy of primary mandibular molars?
* Does the use of Kedo-Nano Plus and Kedo-S Square rotary file systems reduce postoperative pain compared with manual K-files following pulpectomy?
Researchers will compare Kedo-Nano Plus rotary files, Kedo-S Square rotary files, and manual K-files to determine their effect on obturation quality and postoperative pain.
Participants will:
* Undergo clinical and radiographic evaluation of primary mandibular molars requiring pulpectomy.
* Be randomly allocated to one of three instrumentation groups: Kedo-Nano Plus rotary files, Kedo-S Square rotary files, or manual K-files.
* Receive pulpectomy treatment using the assigned instrumentation technique.
* Undergo radiographic assessment of obturation quality following treatment.
* Have postoperative pain assessed using the Wong-Baker Faces Pain Rating Scale at 6, 12, 24, and 48 hours after treatment.