Group I: 30 primary molars were filled with fresh mix of zinc oxide powder with ozonated olive oil

A single-visit pulpectomy procedure was performed . Standardized preoperative periapical radiograph was obtained to assess tooth condition & proper selection. Teeth were anesthetized & Rubber dam isolation was done, then all caries was removed & access opening was gained. Working length was determined by apex locator. All canals were prepared using Kidzo file system in a lateral brushing motion with an Endo-Mate DT endodontic motor at 350 RPM and 2.5 N/cm torque. EDTA gel 17% will be used before instrumentation & irrigation was done with normal saline. Dryness with paper points size 30 . placement of the root canal filling material (zinc oxide-ozonated olive oil) was applied . Intermediate restorative material was placed, then tooth was restored with stainless-steel crown

Group 2: 30 primary molars were filled with fresh mix of zinc oxide powder with olive oil

A single-visit pulpectomy procedure was performed . Standardized preoperative periapical radiograph was obtained to assess tooth condition & proper selection. Teeth were anesthetized & Rubber dam isolation was done, then all caries was removed & access opening was gained. Working length was determined by apex locator. All canals were prepared using Kidzo file system in a lateral brushing motion with an Endo-Mate DT endodontic motor at 350 RPM and 2.5 N/cm torque. EDTA gel 17% will be used before instrumentation & irrigation was done with normal saline. Dryness with paper points size 30 . placement of the root canal filling material (zinc oxide- olive oil) was applied . Intermediate restorative material was placed, then tooth was restored with stainless-steel crown

in this study, pulpectomy procedure was performed in a single visit and the root canals were filled with different obturating materials. The clinical follow up evaluation was carried out after three, six and twelve months after pulpectomy procedures. The teeth were clinically evaluated each follow up visit for the following clinical features: absence of spontaneous pain, no tenderness with percussion, no abnormal mobility and absence of swelling & sinus or fistula. If the tooth exhibited any one of above clinical features, the pulpectomy was considered to be a failure (F); otherwise, it was regarded as clinical success (S).

by assessing the presence or absence of spontaneous pain, presence or absence of tenderness with percussion, presence or absence of abnormal mobility and presence or absence of swelling and/or fistula during the follow-up intervals ( three, six and twelve months )

by assessing the presence or absence of extensive pathologic root resorption, reduction or no change in pre-operative pathologic inter-radicular radiolucency and presence or absence of new postoperative pathologic radiolucency. the assessment is done using periapical radiographs at three, six and twelve months after pulpectomy procedure.