Effect of Different Irrigation Solutions on Coronal Microleakage in Endodontically Treated Teeth (An in vitro Study)

Background: The coronal microleakage in the endodontically treated teeth causes recurrent caries and can be associated with the restoration and the root canal treatment failures. Intra orifice barrier is an efficient alternative method to decrease coronal leakage in endodotically treated teeth and one of the best barriers is glass ionomer. The current study propose that using different irrigation solutions in root canals effect on coronal microleakage.

Purpose: This study aimed to compare the coronal microleakage in glass ionomer obturated root canals in endodontically treated teeth using different irrigation solutions.

Methods: Sixty extracted human single-rooted teeth with single canals were collected and disinfected with 0.5 choloro amin. After root canal therapy and evacuation of 2 mm coronal gutta percha, the teeth were divided into 3 groups of each 20, based on irrigation solutions. Glass ionomer was used as the coronal barrier and the teeth were stored in distilled water. The irrigation solutions used were: 17% EDTA, Alcohol and normal saline. Then all the specimen were submerged in 2% methylene blue dye for 24 hours at room temperature and sectioned sagittally and the dye penetration was assessed by stereomicroscope.

Results: There were not penetration of dye only in 3.3% of teeth and all of the teeth that irrigated with saline showed dye penetration. The dye penetration was seen in 95%, 95% and 100% of the EDTA, alcohol and saline groups, respectively. Dye penetration was higher in Saline group than other two groups but coronal microleakage has not shown statistically significant differences in different groups.

Conclusion: The results of current study indicated that using different irrigation solutions may be associated with decrease in coronal microleakage. Although, based on our findings there are not any significant differences among different irrigation solutions but more studies may be needed to confirm this results.