Purpose: Uncontrolled clinical trial aims to evaluate clinical and radiographic healing after repairing mechanical furcal perforations that occurring during pulpotomy in primary molars by using MTA (Mineral Trioxide Aggregate). Materials and Methods: 34 primary molars in 32 healthy children aged 5-10 years old were treated after occurring of mechanical furcal perforations during pulpotomy by using MTA. Mediate and immediate treatment had been performed after clinical and/or radiographic diagnosis of the perforation, and then teeth had been followed clinically at 1st week 3rd, 6th, 9th, and 12th month and radiographically at 6th and 12th month after perforation repair. Statistical analyses were done at p-value = 0.05 and confidence interval CI 95%. Results: All teeth were successful at the first week. Overall success rate recorded 79.3%, and CI of success was 65% to 93%, 5 teeth had been extracted because of totally failure. There was no significant statistically difference between totally success rates according to gender, tooth position, tooth type, previous sub-base of ZOE, pre-used of Formocresol (p-value > 0.05). Conclusions: Iatrogenic furcal perforated primary molars can be treated by using MTA successfully. Mediate treatment and pre used of FC may have unfavorable prognosis of repairing perforations.