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Cytotoxicity of two available mineral trioxide aggregate cements and a new formulation on human gingival fibroblasts.

AIM: The purpose of this study was to investigate the cytotoxicity of nanohybrid mineral trioxide aggregate (MTA) in comparison with calcium-enriched mixture (CEM) cement and MTA-Angelus, using human gingival fibroblasts (HGFs).

MATERIALS AND METHODS: Nine disc-shaped specimens of each material (in 2 set stat: A, set for 24 h; B, set for 30 min; and C, fresh stat) were prepared. HGFs were exposed to tested materials' extracts or control media. Cytotoxicity testing was performed using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazoliumbromide assay in two time intervals.

STATISTICAL ANALYSIS: Results were evaluated by one-way ANOVA and t-test. Statistical significance was set at P < 0.05.

RESULTS: CEM cement demonstrated favorable cell viability values when completely set (24 h set MTA = 24 h set CEM) at both time intervals. Interestingly, 24 h after incubation, CEM in Groups B and C demonstrated higher cell viability values than MTA (P < 0.05). However, after 72 h of incubation, these groups of CEM and MTA showed equal cell viability. All samples of nanohybrid MTA had slight cytotoxic effects after 24 h of incubation, and moderate cytotoxic effects after 72 h of incubation.

CONCLUSION: Set CEM and set MTA-Angelus exerted similar, favorable effects on cell viability. However, within the limitations of this in vitro study, the results suggest that nanohybrid MTA could not be recommended as a material of choice for cervical root resorption.

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