Comparison of the Antibacterial Efficacy of Manuka Honey Against E.faecalis and E.coli - An In vitro Study.

AIM: To compare the antibacterial efficacy of Manuka honey against E.faecalis and E.coli. MATERIALS AND METHODS: Escherichia coli (ATCC-25922) and Enterococcus faecalis (ATCC-29212) were separately inoculated in the nutrient broth and incubated at 37(o)C for 24-48 hrs. Bacterial samples were kept in contact with each disinfectant solution for varying intervals of time. Once the test time had elapsed 10µL of the bacterial dilutions were plated on Mueller-Hinton agar and incubated for 24-48 hrs at 37°C to estimate the density. Study of the disinfection process with respect to time and Modeling was done. RESULTS: The mean value of the antimicrobial activity of Manuka honey against E.coli and E.faecalis are 1.55 and 0.36 respectively and are relatively higher. It shows that there is a significant difference among the various root canal disinfectant groups against E. coli and E. feacalis. (p<0.001) CONCLUSION: Manuka honey is shown to be a potential root canal disinfectant against gram positive and gram negative bacterial pathogens.

Comparative Evaluation of the Effect of EDTA, EDTAC, NaOCl and MTAD on Microhardness of Human Dentin - An In-vitro Study.

AIM: The aim of this study was to evaluate the microhardness of human dentin by using four irrigating solutions. Materials and Methodos: A total of 40 extracted mandibular premolars were selected and sectioned horizontally in the middle third of the root. Forty specimens of 4 mm thickness were embedded in acrylic resin and polished. Four test groups, each group containing ten specimens were immersed in respective irrigating solution and subjected to vicker's microhardness test at T0, T2 and T5min. STATISTICAL ANALYSIS: The data obtained were analyzed using the one way ANOVA followed by Tukey HSD method with ap=0.05 as the level for statistical significance. RESULTS: Suggested that there was no statistically significant difference in mean values between four experimental irrigating solutions. CONCLUSION: Mixture of Tetracycline isomer i.e. Doxycycline, Citric acid and a Detergent (Tween 80) MTAD not altered the microhardness of root canal dentin significantly and seems to be an appropriate irrigating solution, because of its harmless effect on the microhardness of the root canal dentin.