Aim: The aim of this study was to compare the reversal of shear bond strength of bleached enamel using 3 antioxidant agents. Methods and Materials: 60 labial enamel blocks of maxillary central incisors were prepared, divided into six groups (n=10). Group I is control group without bleaching and without antioxidants, all the other groups were bleached with 30% carbamide peroxide. Group II, composite bonding done immediately without antioxidants application, Group III, composite bonding done after 7 days of storage in artificial saliva without receiving antioxidants. Group IV, bleached enamel receive sodium ascorbate (SA) antioxidant application for 10 minutes, followed with composite bonding immediately, similarly Group V and VI bleached enamel samples received salicylicacid(SAC) and N-acetylcysteine(NAC) antioxidants application for 10 minutes and composite bonding immediately. All the teeth were subjected to shear bond testing in universal testing machine. Statistical analysis used: The shear bond strength data was analyzed by ANOVA test and multiple comparisons by Tukey’s post-hoc tests at a significance level of P < 0·05. Results: The result of this study showed that for shear bond strength, unbleached normal enamel (group I) showed highest SBS value among all the groups.
BACKGROUND Enterococcus faecalis, a facultative anaerobic Gram-positive coccus is involved in the endodontic failures. The bacterial elimination from the infected root canal is often achieved by mechanical cleaning and shaping along with irrigants. This study compares the intracanal bacterial reduction using two instrumentation techniques and irrigation regimens. METHODS 50 extracted human mandibular bicuspid teeth with single canal were decoronated at cemento-enamel junction and pulpectomy done. Working length determined and apical foramen sealed with acrylic resin and specimens autoclaved at 121 0 centigrade for 20 minutes. Samples were divided in to six groups. Group I-Hand instrumentation with 0.9% saline irrigant; Group II-Hand instrumentation with 5% sodium hypochlorite as irrigant; Group III-Rotary instrumentation with 0.9% saline irrigant; Group IV-Rotary instrumentation with 5% sodium hypochlorite as irrigant; Group V-Control-Only saline irrigation; Group VI-Samples taken immediately after sterilization. Sterilized teeth infected with E. faecalis and incubated for one day at 37 0 centigrade. Samples were collected from the canals before and after instrumentation and irrigation. The colony forming units were then counted and transformed to log numbers and analysed statistically. RESULTS The reduction in number of colony-forming units was statistically significant. Statistical analysis reveals bacterial reduction in the following order GIV>GIII>GII>GI>GV. CONCLUSION Bacterial reduction is higher with greater taper (0.06 mm/mm) instrumentation and it is enhanced with the use of 5% sodium hypochlorite compared to 0.9% saline solution.
Aims: The increase of potential side effects and safety concerns of conventional medicaments and irrigants have led to the recent popularity of herbal alternatives. The present in vitro study was undertaken to evaluate the antimicrobial efficacy of 3% NaOCl, Metronidazole, Curcuma longa and Mimusops elengi against Enterococcus faecalis. Settings and Design: The experimental materials were prepared and allotted into four groups (Group 1-NaOCl, Group 2-Metronidazole, Group 3-Curcuma longa, Group 4-Mimusops elengi). Methods and Materials: Agar well diffusion test was done to evaluate the antimicrobial efficacy of various intracanal irrigants. Enterococcus faecalis was used as a test organism. The inoculums of Enterococcus faecalis was streaked on the agar plate. Using punch, wells each measuring 6mm in diameter and 4mm in depth were made and 50 micro liter of the experimental irrigant was pippeted into each well. The plates were placed in Carbon di oxide incubator at 37 degree Celsius for 48 hours and the zones of inhibition were measured. Statistical analysis used:The results were statistically analysed using one way ANOVA and Tukey's HSD Results: Highest inhibitory zone against E. faecalis was shown by 0.5% of metronidazole followed by 25% Mimusops elengi, 3% Sodium hypochlorite and the least is shown by 12.5 % Curcuma longa Conclusions: Considering the undesirable side effects of sodium hypochlorite,metronidazole and herbal irrigants; mimusops elengi and Curcuma longa could be considered as an alternative
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2025 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.