Effect of decreased temperature on the tissue dissolution ability of sodium hypochlorite: An in vitro study

Purpose: The present in vitro study aimed to compare tissue dissolution ability of 5% sodium hypochlorite solution at 3 different temperatures.
Methods: Thirty standardized fragments were prepared from bovine muscle tissue and randomly divided into 3 experimental groups (n=10) according to the temperature of the sodium hypochlorite. The tissue was immersed into a 1.5 mL test tube containing 20 mL of the sodium hypochlorite with the specific temperature and stored for 15 min. The solution was agitated with an ultrasonic tip working for 1 min. Then the solution was filtered and the tissue sample was dried. The weight loss of the tissue was measured as a dissolved tissue by the sodium hypochlorite. One-way analysis of variance was used to compare mean dissolved tissue weight between groups (p <.05).
Results: The highest dissolution values were found in 60°C sodium hypochlorite group achieving the significantly greater mass loss (p <.05), while no significant difference was found between the solutions applied at 20°C and 2.5°C (p >.05).
Conclusion: This in vitro study found that the application of sodium hypochlorite by cooling for cryotherapy did not alter its capacity for dissolving organic tissue compared to application at room temperature.