Comparison of one & two visit treatment of open apices with Mineral Trioxide Aggregate plug

Mineral trioxide aggregate (MTA) usually produces moisture by paper cone for at least 4 hours with regard to some studies that the moisture of periapical tissues is enough to set the MTA. The aim of this study was comparison of one-visit apexification with two-visit apexification using MTA plug. In this experimental study 70 extracted single-rooted human teeth were selected. The crowns and 2mm of apices were cut. Canal preparation was performed to ISO size No.100 in the apical portion. The teeth were randomly divided into 2 experimental groups of 25 and 2 control groups of 10 teeth. The canals in group one were obturated immediately after MTA plug placed. In group two after placing MTA plug, a moist paper point was placed inside the canal, and after 24 hours, canals were obturated. The roots were covered with two layers of nail polish in the designed system and were transferred in a sterile BHI (Brain Heart Broth) culture. A fresh solution of Enterococcus faecalis was injected to the system every 3 days. For 90 days, the time of culture contamination was registered. Survival analysis with Kaplan-Meier method & Log Rank test were used to analyze the data. Mean and 95% CI of survival time in one visit group was 12.77 (0-25.69) days and in two visit group was 4.16 (1.3-7.01) days. There was no significant difference in survival curve between the two groups. Results showed that apexification in one visit by placing an apical plug of MTA is a predictable and reproducible clinical procedure.