Objective: The objective of this study was to evaluate clinically and radiographic the calcium hydroxide-formocresol mix as a root filling material in primary teeth. Materials and Methods: The study was performed on 75 primary molars of patients aged from 4-8 years that indicated for pulpectomy. The teeth were divided randomly into 3 main equal groups. Each group formed of 25 primary molars. Group A: 25 children teeth in which zinc oxide and eugenol (ZO/E) was used as filling material. Group B: 25 children teeth in which calcium hydroxide formocresol mix was used as a filling material. Group C: 25 children teeth in which Metapex was used as filling material. The teeth were assessed clinically and radiographically at 5 different intervals (preoperative, 24 hours, 6 weeks, 3 months and 6 month postoperative) using standard clinical and radiographic criteria. Results: It was found that Metapex offers best clinical and radiographic results when compared with ZO/E and calcium hydroxide formocresol mix. ZO/E (group A) showed (84%) success rate, while the Calcium hydroxide-formocresol mix (group B) showed a higher success rate (88%) than (ZO/E). Metapex (group c) show best success rate of all groups (94%) while failure rate showed (16%), (12%) and (6%) respectively. Conclusion: Although Metapex proved the best properties as root filling material with a highest success rate, Calcium hydroxide-formocresol mix showing competitive properties to Metapex and better results than ZO/E. Both of Metapex & Calcium hydroxide-formocresol mix have the power to be an alternative for ZO/E in pulpectomized primary molars.
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