Hexane, ethyl acetate, ethanol and methanol extracts of
Psidium guajava, Terminalia chebula, Mimusops elengi and
Achyranthes aspera were tested against the dental caries
causing bacteria Streptococcus mutans and fungus
Candida albicans isolated from caries infected
patients. All the four extracts of P. guajava
showed activity against both S. mutans and
C. albicans. Maximum zone of inhibition was
observed in ethyl acetate of P. guajava. The four
extracts of T. chebula and M.
elengi showed antibacterial activity against S.
mutans. M. elengi extracts and ethanol
extract of T. chebula did not show any antifungal
activity against C. albicans. Except for the
hexane extract of A. aspera, the other three
extracts showed activity against the tested microbes. The ethyl
acetate P. guajava leaf extract showed the
minimum inhibitory concentration (MIC) against S.
mutans to be <0.076 mg/mL in both MHB and
BHI. The P. guajava ethyl acetate extract was
subjected to GC-MS.
Objective. The objective of this study was to evaluate the efficacy of two retreatment NiTi systems (protaper universal retreatment files, R-Endo), when compared to manual technique in removing Gutta-percha obturated with two sealers. Study Design. Sixty extracted single-rooted premolars were instrumented with Protaper rotary files till F3. The specimens were divided into six groups. Groups 1, 2, 3 were obturated with Gutta-percha and zinc oxide eugenol and Groups 4, 5, 6 were obturated with Gutta-percha and AH-plus. The retreatment was carried out in groups 1 and 4 with H-files and GGdrills, groups 2 and 5 with R-endo retreatment files and groups 3 and 6 with Protaper retreatment files. The roots were sectioned and evaluated under optical stereomicroscope. Statistical analysis was performed with one-way ANOVA and Newman-Keul's test at P < 0.05.
Results. The manual technique resulted in cleaner canal walls when compared with both rotary retreatment systems. Conclusion. NiTi rotary retreatment files can be used to remove the filling material quickly, but it should be followed by hand instruments to obtain better canal wall cleanliness.
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