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Root perforation is an endodontic procedural error. Treatmentof perforation depends on the location and size of perforation,duration of exposure to the oral cavity, patient's cooperation and degree oftissue inflammation. Several materials have been introduced to seal off the perforation. MTA is one of the best materials for this purpose. Case Report: We report the repair of distal root perforation in a primary mandibular second molar of a 9 year-old boy who had congenital absence of the secondfatcat:4i6hqobnrbegxptrzhknlw6x6a