Objectives: the aim of this study was to evaluate the effects of laser irradiation and self-etching primer on the microleakage of apicoectomized teeth retrofilled with Mineral Trioxide Aggregate, Angellus (MTA). Methods: sixty bovine teeth were endodontically treated, had the apical 3 mm resected and 3-mm-deep cavities for retrofilling were prepared. The specimens were divided into 5 groups: G1 – control group, without any previous treatment; G2- teeth treated with Nd:YAG laser (Pulse Master 600 IQ, American Dental Technologies) on the internal walls of the root-end cavities; G3- teeth treated with Nd:YAG laser on the internal walls of the root-end cavities and on the surface of the apical resection; G4 – teeth treated with self-etching primer (Clearfil SE Bond, Kuraray) on the internal walls of the root-end cavities, and G5 – teeth treated with self-etching primer on the internal walls of the root-end cavities and on the surface of the apical resection. The specimens were retrofilled with MTA. Then, they were impermeabilized, immersed in Rhodamine B-2% solution, stored at 37°C and 100% humidity for 24 hours, washed in running water for 12 hours, dried and resected in buccal-lingual sense. Marginal microleakage at material/root interface was evaluated quantitatively through linear measure (mm) by a steromicroscope. Results: data were submitted to ANOVA One-way and Tukey's tests (p<0.05) and the values obtained for microleakage were: G1-2.76 +0.60; G2 – 2.30+0.84; G3-2.21+0.85; G4-1.04+0.76, and G5-0.84+0.40. Statistical analysis indicated significant difference among the groups. Groups 4 and 5 presented the lowest values of microleakage. Conclusion: the best results of marginal sealing were observed in the groups that used the self-etching primer. No alteration in the sealing was observed despite of the variation in the areas of laser application or bonding system application. MTA alone as a retrofilling material was not sufficient to contain the marginal microleakage.

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