Assessment of Calcium Hydroxide Pastes to Maintain Alkalinity in Combination with Different Vehicles

Antimicrobial action of calcium hydroxide relies on maintenance of high pH over a period of time. The present study aimed to evaluate the ability of calcium hydroxide to retain alkalinity over extended periods in combination with different vehicles. Two grams of calcium hydroxide powder was mixed with three vehicles; Group 1: Distilled water, pH-7.9, Group 2: Lidocaine, pH-4.7, Group 3: Alkaline water, pH-11.8. The pH of pastes was measured utilizing the Ex-Stik pH meter to observe decay over 28 days. Testing was done over five intervals: Day 1, 7, 14, 21, 28. The pH meter was thoroughly washed with deionized water and wiped dry between readings. Measurements were repeated three times for each specimen, and mean values were calculated. All samples were stored in closed vials in 37°C incubation to eliminate temperature variations until the time of measurement. Statistical evaluations of results were performed with Students t-test. Results demonstrated a statistically significant difference, with pH being greater in Group 3 at all times, even at 28 days, maintaining an average pH of 12.20. Calcium hydroxide powder, when mixed with alkaline water, helps maintain an alkaline pH, enhancing disinfection and preventing postoperative flare-ups.