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Abstract : This randomized controlled trial is aimed to evaluate the clinical and radiographic success of endodontic treatments in necrotic primary molars when cinnamon oil (CEO) and triple antibiotic paste (TAP) were applied as an intracanal medicaments compared to pure calcium hydroxide (CH). The study sample consisted of 60 necrotic second primary molars in 56 children aged between 4-7 years, these cases were allocated randomly into three groups: Group 1 (experimental, n=20): CEO was applied as intracanal medicament, Group 2 (experimental, n=20): TAP was applied as intracanal medicament, and Group 3 (control, n=20): pure CH was applied as intracanal medicament. The pulp cavity was accessed in the first session and the root canals were prepared using K-files, irrigation was done using 5.25%, sodium hypochlorite, and then the final irrigation was done with saline, then one of the three studied intracanal medicaments was applied. In the second session, the intracanal medicaments were removed using 5.25%, sodium hypochlorite and saline irrigation, the root canals were filled with zinc oxide and eugenol, then cavity was filled with glass ionomer and stainless-steel crowns were used as the final restoration. Clinical and radiographic follow-ups were done within 3,6,12 months. The three intracanal medicaments used in this study (CEO, TAP, and calcium hydroxide) showed good clinical and radiographic results. There was a total of five failure cases (1 in CEO group, 1 in TAP group and 3 in CH group), without any statistically significant differences (p > 0.05). Both CEO and TAP intracanal medicament groups showed a higher clinical and radiographic success rate (94.7%, 94.4%) respectively than CH intracanal medicament group (84.2%). Both CEO and TAP can be applied as intracanal medicaments in endodontic treatments of necrotic primary molars.