Effect of Irrigants on Setting Time of Obturating Materials Used in Endodontic Treatment of Primary Teeth: An In Vitro Study

Abstract

The variation in setting time of an obturating material can affect it’s dentinal penetrability and specific properties, ultimately influencing the treatment outcome. This study aimed to evaluate the influence of commonly used irrigants such as 0.9% saline, 3% sodium hypochlorite (NaOCl) and 2% chlorhexidine (CHX) on the setting time of endoflas and zinc oxide eugenol (ZOE) in primary extracted teeth. Eighteen decoronated samples were prepared and divided into three groups based on the final irrigation protocol; Group A was 0.9% saline, Group B was 3% NaOCl and Group C was 2% CHX. Each group was further divided into two based on the obturating material. Setting time was analyzed using a 100g Gillmore needle. Indentations were performed twice per sample and the mean was calculated. One-way ANOVA with Tukey’s post hoc test were performed for statistical analysis (p<0.05). On interaction with NaOCl and CHX, both ZOE and endoflas showed a statistically significant decrease in setting time, but overall reduction was greater with CHX. The setting time of ZOE and endoflas have been found to decrease significantly when they come into contact with NaOCl and CHX in clinical practice. It is important for clinicians to irrigate with saline and thoroughly dry the canal to eliminate any residual traces of the other irrigants before proceeding with obturation