Abstract: Objective: To evaluate the clinical effect of MTA apical barrier technique used in the open apices teeth accompanied with radicular cyst. Methods: Twenty-four patients diagnosed with open apices teeth accompanied by radicular cyst were included in this study. All teeth were the upper anterior teeth. Before the surgery all teeth were cleaned and shaped. In the surgery, the open apices were shaped and pluged with 3-5mm MTA after removing the cyst. Until the MTA completely set about one week later, the root filling was performed in the open apices teeth. The patients were followed-up for at least two years. Results: Good result was achieved in all cases. The two-year postoperative X-ray films showed that the apical radiolucent areas of the teeth with pre-existing radicular cyst completely disappeared. No new radiolucency was found around the roots. Conclusion: MTA apical barrier technique is effective in the treatment of open apices teeth accompanied with radicular cyst.

Key words: MTA apical barrier, Open apices teeth, Radicular cyst