Antibacterial activity of new atraumatic restorative treatment materials incorporated with Azadirachta indica (Neem) against Streptococcus mutans.

BACKGROUND: The antibacterial property of new atraumatic restorative treatment (ART) materials incorporated with Azadirachta indica (Neem) on Streptococcus mutans was carried out. MATERIALS AND METHODS: The study was carried out by using the agar diffusion method to determine the antibacterial property of ART materials (ART-I and ART-II). The zone of inhibition was tabulated, and the data was statistically analyzed using the student t-test. The minimum inhibitory concentrations (MIC) and the minimum bactericidal concentrations (MBC) of the ethanolic extract of Neem were recorded. RESULTS: The MIC and MBC of the mixture of the ethanolic extract of Neem was 3.13% and 12.5% respectively. The zone of inhibition of ART-I and ART-II was 11.81 mm and 11.97 mm respectively. Significant differences were observed between these two ART materials (P = 0,08). CONCLUSION: Both the new ART materials i.e. ART-I and ART-II have considerable antibacterial activity against S. mutans.

Mutagenicity potential (affect) of new atraumatic restorative treatment (ART) material incorporated with Azadirachta indica (Neem) against Salmonella typhimurium.

BACKGROUND: The mutagenicity potential of a new atraumatic restorative treatment (ART) material against Salmonella typhimurium without metabolic activity using the Ames test (genotoxicity) was carried out. METHODS AND MATERIALS: The potential mutagenicity of new atraumatic restorative treatment materials (ART-I and ART-II) was analyzed using the Ames test. The materials were eluted in dimethyl sulphoxide, 0.9% NaCl solution and sterilized de-ionized water and the aliquots were used after an incubation period of 24 h at 37 °C. Mutagenic effects of the materials were tested on Salmonella typhimurium strains TA 98 and TA 100 using the standard assay, and in absence of S9 fraction from rat liver. RESULT: No mutagenic effects were detected for these new ART materials on S. typhimurium TA100. The incubated DMSO extract and 0.9% NaCl extract (50 µl/plate) of the ART-I exhibited a weak mutagenic potential on S. typhimurium TA 98. In particular, Aqua extract (50 µl/plate) of ART-II, was associated with a weak mutagenic potential on S. typhimurium TA98. CONCLUSION: Both ART materials (ART-I and II) exhibited weak mutagenic effects on S. typhimurium TA98 whereas no mutagenic effect was detected on S. typhimurium TA100. ART-II is safer than ART-I.