the effect of thickness on the sealing ability of cem cement as a root-end filling material

background and aims. different materials have been used for root-end filling during surgical endodontic treatment. the aim of this in vitro study was to evaluate the dye penetration in different thicknesses of calcium enriched mixture (cem) cement as root-end filling material. materials and methods. following root canal filling in 70 extracted human single-rooted premolar teeth, the apical 3 mm of their root-ends was resected; the root-end cavities with depths of 1, 2 and 3 mm were prepared by ultrasonic retrotips and filled with cem cement. after setting of cement, the roots were immersed in 2% rhodamine b and the dye leakage was measured under stereomicroscope (×16) using image j software. the data were analyzed by one-way anova and bonferroni post hoc tests at 5% significance level. results. the means and standard deviations of dye penetration in the 1, 2, and 3 mm groups were 3395.5 ± 1893.4, 3410.4 ± 1440.5, and 2581.6 ± 1852.9 µm, respectively. the one-way anova analysis indicated significant differences (p < 0.001); however, the bonferroni post hoc test revealed that only the positive control group differed significantly from the experimental groups (p < 0.001). conclusion. the findings demonstrated cem cement to have an adequate root-end sealing ability in 3-mm thickness.