Aim:To compare the cleaning efficiency of manual and rotary instrumentation in the apical third of the root canal system.Materials and Methods:In group 1 (n=10), instrumentation was performed with stainless steel K-file; in group 2 (n=10), it was done with hand ProTaper files; and in group 3 (n=10), instrumentation was done with ProTaper rotary. Distilled water was used for irrigation. The apical third was sectioned transversally and histologically processed. The cross sections were examined under optic microscope and debris was measured using Motic software.Results:Instrumentation with stainless steel K-files showed minimum amount of debris, followed by ProTaper hand files, and rotary ProTaper files were least effective with maximum amount of debris; however, there were no significant differences between the three experimental groups.Conclusions:Both the manual and rotary instrumentation are relatively efficient in cleaning the apical third of the root canal system and the choice between manual and rotary instrumentation should depend on case to case basis.

The complete microfloral debriment of the root canal is possible only through successful endodontic treatment. Due to complexicity constraints of root canal system complete microfloral removal by simply mechanical instruments is not sufficient. Therefore we aim to evaluate the antimicrobial efficacy of five different intracanal medicaments such as calcium hydroxide, chlorhexidiene, octenidol, endosepton and calcium hydroxide and chlorhexidine against Enterococcus faecalis. The Antibacterial activity of aforesaid medicaments was done against Enterococcus feacalis using agar disk diffusion method, over a period of 24 hrs and 72 hrs. The samples were divided into 6 groups. The zone of inhibition was measured after 24 and 72 hrs and were recorded in millimeters and compared with respect to control. There was a significant difference in the mean zone of inhibition at 24 and 72 hrs between calcium hydroxide, endoseptone, octenidol, calcium hydroxide and chlorohexidine combination, chlorohexidine and control group. Chlorohexidine was found to have maximum inhibitory efficacy followed by calcium hydroxide and chlorohexidine combination. Within the limitations of this study it may be concluded that Chlorhexidine can be used as an efficient intracanal medicament.

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