Cytotoxicity evaluation of Bio-C, CeraSeal, MTA - Fillapex, and AH Plus root canal sealers by microscopic and 3-(4, 5 dimethythiazol-2yl)-2, 5-diphenyltetrazolium bromide (MTT) assay.

Abstract

The aim of this study was to compare the cytotoxic effect of calcium silicate-based Bio-C, CeraSeal, and mineral trioxide aggregate (MTA)-based (MTA-Fillapex) sealers to a widely used resin-based sealer (AH Plus) using 3-(4, 5 dimethythiazol-2yl)-2, 5-diphenyltetrazolium bromide (MTT) assay and microscopic examination. A total of (n = 36) samples divided into four groups with three sealer samples per time period of 0 h, 24 h, and 7 days after mixing were extracted in cell culture medium using Dulbecco's Modified Eagle's Medium. The cytotoxicity of these sealers was evaluated using an MTT assay on L929 mouse fibroblasts, and changes in the cell morphology were observed under an inverted phase-contrast microscope (×20). The values obtained were analyzed statistically using one-way ANOVA, Tukey's post hoc, and Bonferroni's test. Bio-C and CeraSeal showed a reduction in cytotoxicity from severe at 0 h to no cytotoxicity at 24 h and 7 day time period. AH Plus showed severe cytotoxicity at all time periods. MTA-Fillapex showed severe cytotoxicity at 0 h which decreased to moderate at 24 h and 7 days. The differences between groups were statistically significant (P < 0.05). The sealers with resin constituents (AH Plus and MTA-Fillapex) showed severe-to-moderate cytotoxicity at different time periods, whereas calcium silicate-based sealers (Bio-C and CeraSeal) were relatively biocompatible as their cytotoxicity decreased significantly from severe initially to noncytotoxic with time.