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Objectives: This study evaluated the effects of intraradicular moisture on the pushoutbond strength of a fibre post luted with several self-adhesive resin cements. Materials and Methods: Endodontically treated root canals were treated with oneof three luting cements: (1) RelyX U100, (2) Clearfil SA, and (3) G-Cem. Roots werethen divided into four subgroups according to the moisture condition tested: (I) dry:excess water removed with paper points followed by dehydration with 95% ethanol,(II) normal moisture: canals blot-dried with paper points until appearing dry, (III)moist: canals dried by low vacuum using a Luer adapter, and (IV) wet: canals remainedtotally flooded. Two 1-mm-thick slices were obtained from each root sample and bondstrength was measured using a push-out test setup. The data were analysed using atwo-way analysis of variance and the Bonferroni post hoc test with p = 0.05. Results:Statistical analysis demonstrated that moisture levels had a significant effect on thebond strength of luting cements (p < 0.05), with the exception of G-Cem. RelyX U100displayed the highest bond strength under moist conditions (III). Clearfil SA had thehighest bond strength under normal moisture conditions (II). Statistical ranking ofbond strength values was as follows: RelyX U100 > Clearfil SA > G-Cem. Conclusions:The degree of residual moisture significantly affected the adhesion of luting cements toradicular dentine.
Objectives This study aimed to introduce the use of laser-induced breakdown spectroscopy (LIBS) for evaluation of the mineral content of root canal dentin, and to assess whether a correlation exists between LIBS and scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS) methods by comparing the effects of irrigation solutions on the mineral content change of root canal dentin. Materials and Methods Forty teeth with a single root canal were decoronated and longitudinally sectioned to expose the canals. The root halves were divided into 4 groups (n = 10) according to the solution applied: group NaOCl, 5.25% sodium hypochlorite (NaOCl) for 1 hour; group EDTA, 17% ethylenediaminetetraacetic acid (EDTA) for 2 minutes; group NaOCl+EDTA, 5.25% NaOCl for 1 hour and 17% EDTA for 2 minutes; a control group. Each root half belonging to the same root was evaluated for mineral content with either LIBS or SEM/EDS methods. The data were analyzed statistically. Results In groups NaOCl and NaOCl+EDTA, the calcium (Ca)/phosphorus (P) ratio decreased while the sodium (Na) level increased compared with the other groups (p < 0.05). The magnesium (Mg) level changes were not significant among the groups. A significant positive correlation was found between the results of LIBS and SEM/EDS analyses (r = 0.84, p < 0.001). Conclusions Treatment with NaOCl for 1 hour altered the mineral content of dentin, while EDTA application for 2 minutes had no effect on the elemental composition. The LIBS method proved to be reliable while providing data for the elemental composition of root canal dentin.