بررسي مقايسه اي اثر حلاليت بافتي هيپوكلريت سديم و كلسيم هيدروكسايد بر روي بند ناف جنين انسان

Comparison of tissue solubility of human umbilical cord by sodium hypochlrorite and calcium hydroxide

Introduction: As hiomechanical preparation of root canal system is not always completely accomplished because of morphological and physical barriers, to obtain a sterile root canal for the success of endodontic treatment, use of chemical solvents is essential The aim of this in vitro study was to compare effects of Ca (OH) 2 and NaOCl in single and combination usage for this purpose.Methods and Materials: In this experimental study, five groups of 40 pieces of human umbilical cord samples were placed in 10 ml of different solvents for 1 wk. The weight of samples was adjusted to 0.03 g. Experimental solvents included: 1) Calcium hydroxide solution (0.6g per ml), 2) 0.5% sodium hypochlorite, 3) 5% sodium hypochlorite, and 4) calcium hydroxide solution for 1 wk and then 0.5% sodium hypochlorite for 30 min, 5) Normal saline. Tissue solubility of these solvents was compared by weight changes of samples after 1 wk. Data was analyzed with Kruscal- wallis and t- student tests.Results: There was no significant difference between calcium hydroxide (Group 1) and salin (Group 5). Other groups had significant differences (p value < 0.01).Conclusion: According to findings of this study, tissue solubilizing of 0.5% NaOCl is less than 5% although both have more solubilizing power than Ca (OH)2. Pretreatment with Ca (OH)2 could not enhance the tissue dissolving effect of 0.5% NaOCl.