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The aim of this study was to examine the mutagenic potential of canal sealers AH+ and AH26 by Salmonella/microsome assay. The materials were tested immediately after mixing, 1 hr and 1 month later, respectively. The dimethyl sulfoxide extracts of sealers in amounts of 3.0, 1.5, and 0.75 μl/plate were used. The plated bacterial strains of Salmonella were TA 98 and TA 100. The results showed that AH+ is mutagenic toward strain TA 100 1 hr after mixing. One month after mixing, mutagenic activity was expressed only in TA 98. Paste A showed strong mutagenicity toward TA 100. AH26 was more mutagenic to the TA 100 immediately after mixing, 1 hr later, and 1 month after it was polymerized. Also it was mutagenic toward TA 98 in the polymerized condition. Further examinations should be conducted to establish a definitive conclusion about mutagenic potential for these two endodontic materials.