Methods: In the current research, 2% Magnesium as Magnesium carbonate was mixed mechanically with MTA and then mixed according to manufacturer's instructions. At this level, 20 extracted human single-rooted teeth were used. The crowns were removed and spaces were mechanically enlarged using K-files and Gates Glidden burs. Cements including experimental (n=10) and Control Group were filled in dentine slices. The filled specimens were then soaked in (37°C) water for 24 h. The specimens were glued to Instron machine and then microtensile bond strengths to root canal dentin were measured with this device.
Results: The mean bond strengths of each group, with and without 2% Magnesium carbonate were (8.11±3.21), (6.21±5.01) respectively. Statistically significant differences were observed among the Magnesium carbonate contained group and the control group (P≤0.05).
Conclusions: Chemical reaction between cement and dentine fully demanded and may impede the leakage properties of endodontic cement. The present study confirmed that adding 2% Magnesium as Magnesium carbonate might improve the bonding strength of MTA cement.