In endodontic practice, calcium hydroxide is widely used for a number of re
asons associated with its high pH, The purpose of the present study was to
determine in vitro the alkalizing potential of newly introduced calcium hyd
roxide gutta-percha points that are proposed for temporary filling of root
canals. The materials tested were: calcium hydroxide gutta-percha points; c
hemical pure calcium hydroxide powder mixed with distilled water; and Reoga
n rapid, a nonsetting calcium hydroxide preparation. The materials were pla
ced into dialysis tubing and transferred into plastic vials containing bidi
stilled water. Measurements were taken by a digital pH meter after 10, 20,
and 30 s; 1, 15, and 30 min; and 1, 2, 3, 24, 48, 72, 96, and 120 h, The ca
lcium hydroxide containing gutta-percha points showed a significantly lower
alkalizing potential than Reogan rapid and calcium hydroxide mixed with di
stilled water (p < 0.05).