RESUMEN
Background: The performance of composites profoundly depends on the quality of the fiber-matrix interface. Good interfacial adhesion provides composites with structural integrity and efficient load transfer between fiber and matrix. Nevertheless, untreated carbon fibers are extremely inert and hence have low adhesion to resin matrices. In the meantime, the relatively weak transverse and interlaminar properties significantly limit the composite performance and service life. To overcome these barriers, a fiber-based reinforcement which has strong interfacial adhesion to the matrix is highly desired to improve the overall composite properties
Aim of the study: was to assess the Effect of different surface Treatments of Carbon fibers and their influence on the interfacial properties of carbon fiber/epoxy composites
Methods: A review of the scientific literature [from 1970 to 2017]. Pubmed, Embase and CENTRAL were searched to identify studies that investigated the different types of surface treatment of carbon fibers and how this can affect the quality of carbon fiber composite. Identification of papers and data extraction were performed by different independent researchers
Conclusion: Various combinations of surface treatment of carbon fibers are crucial to improve its adhesion with various matrices. Treatment significantly influences fiber characteristics. Nevertheless, optimization is required to select appropriate treatment method per application and desired properties
RESUMEN
Background: The purpose of this study was to assess. The influence of diverse irrigation protocols on resin sealer bond strength to dentin
Materials and Methods: A sum of 36 single-established andibular premolar teeth were utilized. Root channel forming strategies were applied with ProTaper rotary instruments [Dentsply Maillefer] up to measure F4. The prepared models were then arbitrarily collected into 3 groups [n =12]. For each group, an ultrasonic tip [measure 15, 0.02 taper] which was additionally covered with an epoxy resin based sealer and put 2 mm shorter than the working length. The sealer was then actuated for 10 s. A push-out test was utilized to gauge the bond strength between the root canal dentine and the sealer. Kruskal-Wallis test was used to assess the push-out bond strength of epoxy based sealer [P=0.05]. The failure mode information were statistically examined utilizing Pearson's chi square test [P=0.05]
Results: Kruskal-Wallis test showed that there were statistically insignificant difference between the push out bond strength values of 3 mm [p=0.149] and 6 mm [P=0.052] , for group one and two, while there was a statistically significant difference with the push out bond strength value of 9 mm [P=0.029]. Pearson's chi square test showed statistically significant differences for the failure types among the groups
Conclusion: Several epoxy resin based sealers actuated ultrasonically demonstrated comparative bond strength in oval formed root canals. Apical areas for all groups have higher push out bond strength standards than middle and coronal segments