Table 4: Means and standard deviations of pH values for the different materials and periods.

PCPC + OBi PC + OZrPC + CTZOE

12 h A A A A B
24 h A A A A B
48 h A A A A B
72 h A A A A B

Same letters within the same period of time indicate statistically similar results ( ).
PC: Portland cement, OBi: bismuth oxide, OZr: zirconium oxide, CT: calcium tungstate, ZOE: zinc oxide and eugenol cement.