Influence of addition of calcium oxide on physicochemical properties of Portland cement with zirconium or niobium oxide.

Context: Calcium oxide (CaO) may be added to mineral trioxide aggregate (MTA) or Portland cement (PC) to improve physicochemical and biological properties.

Aims: To evaluate the physicochemical properties of PC associated with radiopacifiers and CaO.

Materials And Methods: MTA Angelus, PC + 30% zirconium oxide (Zr), or 30% niobium oxide (Nb) associated with 10 or 20% of CaO were evaluated.