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Aims: The aim of this study is to evaluate and compare the sealing ability of a new resin cement which was undergoing trial with other three luting cements. Settings and Design: In vitro study. Subjects and Methods: Forty extracted intact human premolars were selected and standardized class 5 preparations for inlays were done at cementoenamel junction of buccal surfaces and direct composite inlay was fabricated. The samples were randomly grouped into 4: Group I luted with Rely X ARC resin cement, Group II with DCRC-10, a new indigenously developed resin cement, Group III with FujiCEM, and Group IV with zinc phosphate. After 24 h storage, samples were thermocycled and immersed in basic fuchsine dye. The longitudinal sections were assessed under a stereomicroscope for microleakage using graded criteria. Statistical Analysis Used: To analyze leakage scores among four groups and between enamel and dentin/cementum margins, Kruskal-Wallis nonparametric test and the Mann-Whitney test at P < 0.05 were used. Results: The dye penetration at cementum/dentin margins showed a statistically significant difference among four groups (P < 0.001). Adhesive luting cements produced lesser leakage scores at both margins than those cemented with zinc phosphate. Conclusions: The indigenously developed resin cement (DCRC-10, Group II) is comparable to that of Group I (RelyX ARC) in terms of its luting efficiency.
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AIM: This study evaluated the antibiofilm efficacy of calcium hydroxide-based sealer incorporated with chitosan nanoparticles (CS-NPs) and zinc oxide nanoparticles (ZnO-NPs) against two strains of Enterococcus faecalis (ATCC 29212, OG1RF). MATERIALS AND METHODS: The materials tested were Apexit Plus sealer in the commercial unmodified form and two modified forms with CS-NP and ZNO-NP, respectively. Crystal violet assay and confocal laser scanning microscopy (CLSM) study were used to assess the bacterial viability of biofilms grown in wells of microtiter plate and glass slides, respectively. Two E. faecalis strains (ATCC 29212, OG1RF) were used for the study. RESULTS: The crystal violet assay done on E. faecalis strain ATCC 29212 showed a significant decrease in the optical density (OD) value with ZNO-NP-incorporated calcium hydroxide sealer when compared with CS-NP. In the case of E. faecalis strain OG1RF, only ZNO-NP-incorporated calcium hydroxide-based sealer showed reduction in the OD value. In CLSM study done on E. faecalis strain ATCC 29212, only ZNO-NP-incorporated calcium hydroxide-based sealer showed reduction in the thickness of biofilm. No groups of OG1RF strain showed reduction in the thickness of biofilm. CONCLUSION: The incorporation of nanoparticles (ZnO and CS) into calcium hydroxide-based sealers significantly enhances the antibiofilm efficiency against E. faecalis strain ATCC 29212 but has questionable effectiveness against E. faecalis strain OG1RF. The present study demonstrates that ZNO-NP shows better antibiofilm efficacy than CS-NP against both strains of E. faecalis.
RESUMO
AIMS AND OBJECTIVES: The aim and objective of the study were to determine the incidence of flare-ups during endodontic treatment and to identify the risk factors associated with flare-ups. SUBJECTS AND METHODS: A total of 1725 patients who were treated during the time period of 2009-2014 by the same endodontist were reviewed. Incidence of flare-up, patients' age, gender, status of pulp, tooth position, number of roots, and treatment provided were taken from their dental records. Relationship between these factors and flare-ups was examined. Statistical analysis was done using Pearson Chi-square test and Fisher's exact test. RESULTS: A total of 2% incidence of endodontic flare-ups was seen out of 1725 cases. Patient's age, gender, and diagnosis had a significant effect on the development of flare-ups (P < 0.05). Tooth type, position of tooth, number of root canals, number of visits, and treatment modality had no significant effect on flare-up incidence. CONCLUSIONS: Diagnosis plays an important role in predicting the incidence of flare-ups. Patients in the age group of 40-60 years had a higher risk of developing flare-ups. Women compared to men are more prone to flare-ups.
