Effects of Temperature and Hypochlorite Concentration on the Rate of Collagen Dissolution

Introduction: The aim of this research was to quantify the effects of temperature on the rate of collagen dissolution in different concentrations of sodium hypochlorite solution. Methods: A customized laboratory apparatus was used to immerse 23 samples of reticulated collagen matrices and 20 samples of non-reticulated collagen matrices in a continuously agitated solution of 1%-5% (m/v) sodium hypochlorite at 20 degrees C-35 degrees C. The time needed for complete dissolution of each sample was used to generate mathematical equations that described the effects of temperature and hypochlorite concentration on the dissolution of collagen. Results: Both temperature and concentration of sodium hypochlorite were positively correlated with the rate of collagen dissolution. The same speed of dissolution was obtained for 5% sodium hypochlorite at 20 degrees C, 4% solution at 20.8 degrees C, 3% solution at 23.5 degrees C, 2% solution at 26.9 degrees C, and 1% solution at 36 degrees C. Conclusions: Treatment protocols that involve sodium hypochlorite, which is the preferred root canal irrigant, should consider the important effects caused by variations in the use of different irrigant temperatures and concentrations. Further investigation is required to establish the optimal concentration and temperature of sodium hypochlorite solution for root canal irrigation.