Ex Vivo Comparison of the Discoloration Potential of Two Endodontic Sealers in Human Incisors

background and aim: tooth discoloration induced by endodontic materials is a common finding which can impair the aesthetic outcome. the aim of this study was to compare the coronal discoloration induced by well-root st and ah26 root canal sealers by using the easyshade ® colorimeter.materials and methods: forty-five intact maxillary central incisors were involved in this experimental study. the prepared specimens were randomly distributed in experimental and control groups as follows: group 1 (well-root st, n=15), group 2 (ah26, n=15), positive control group (amalgam, n=5), negative control group1 (guttapercha, n=5), and negative control group 2 (distilled water, n=5). in order to evaluate the discoloration rate ( δe), the easyshade ® spectrophotometer was used at one and six months post-obturation. analysis of variance (anova) was used to compare color changes in the groups at the mentioned time intervals.results: the difference between the experimental groups (well-root st and ah26) and the negative control groups was not statistically significant (p=0.99) at one and six months after obturation. however, the difference between the experimental groups and the positive control group was significant (p=0.000). the difference between the positive control group and the negative control groups was also significant (p=0.000).conclusion: the results of the current study indicate that both experimental sealers (well-root st and ah26) have minimal discoloration effects and can be used safely in the aesthetic zone.