A comparison of microleakage between two retrograde filling materials (MTA and Amalgam) using dye leakage method Dr. M. Tabrizizadeh* - Dr. K. Rostam Yazdi** *- Assistant Professor of Endodontics Dept. – Faculty of Dentistry – Yazd University of Medical Sciences. **- Dentist. Background and Aim: There is a need for a material with high sealing ability to prevent bacterial and tissue secretions penetration in endodontic surgery. The aim of this study was to compare the microleakage of amalgam and MTA filling materials. Materials and Methods: Thirty – two single – rooted extracted human teeth were collected. Each tooth was apically resected and retroprepared to 3mm depth. Teeth were divided randomly into two groups of 13 teeth each. First group was retrofilled with amalgam and second group with MTA. All root surfaces, except the ending part, were covered with layers of nail polish. Following immersion in 2% methylene blue for 48 hours, the roots were sectioned and the depth of dye penetration was evaluated by computerized scanning and photoshop software. Results were evaluated by t – test. Results: It was shown that MTA microleakge was significantly less than that of amalgam. The mean dye penetrations of MTA and amalgam were 1.75 mm and 3mm, respectively (pv = 0.0001). Conclusion: The findings of the present study confirm the proper sealing ability of MTA. Key words: Microleakage – Root end – Amalgam – MTA. | 
