2017 年 8 巻 1 号 p. 24-32
Mineral trioxide aggregate (MTA) is used for several endodontic treatments. However, gas generation from the MTA and H2O2 reaction mixture is not known. We therefore investigated the generated gas using a dissolved O2 meter, and assessed the density of H2O2 changes before and after the reaction using the potassium permanganate and X-ray diffraction (XRD) methods. On measurement of the dissolved O2 in the solution, the dissolved oxygen density did not the change when MTA was immersed in pure water. On the other hand, the dissolved O2 density increased when MTA was immersed in 3% and 30% H2O2. The results of XRD suggested that oxygen was generated by the resolution of the H2O2. In addition, H2O2 density decreased after the reaction between White Portland Cement and H2O2. The oxygen gas source was the resolution of H2O2. We must therefore pay attention during the use of H2O2 in root canal irrigation or bleaching agents.
