RESUMO
Background: To assess the frequency of flare-ups and recognize the risk factors comprising age, initial diagnosis, number of root canals, tooth type, gender, the type of irrigation regimen, the number of visits and treatment modality, in patients who expected root canal treatment from May 2015 to May 2017
Materials and Methods: Records of 454 teeth belonging to 302 patients treated by endodontics expert throughout 2-year period were kept. Tooth, patient, and treatment characteristics were assessed and the relations between these characteristics and flare-ups were studied. Statistical analysis was carried out by using Chi-square test, regression analyses, and exact test
Results:The incidence of flare-ups was 16 [3.5 %] out of 454 teeth that had endodontic treatment. Pulpal necrosis without periapical pathosis was the most mutual symptom for flare-up [5.9 %] [P < 0.01]. Teeth undergoing multiple visits had a higher risk of developing flare-ups compared to those with single appointments [OR: 3.27, CI: 1.21-6.91, p<0.01]. There were similarly no statistically significant differences in the frequency of flare-ups as regards to age, tooth type, gender, treatment modality, number of root canals, and the irrigation solutions that utilized amid the treatment
Conclusions:The frequency of flare-up is insignificant when teeth are treated in one visit. Absence of a periapical lesion in necrotic teeth is a significant factor for flare-ups
RESUMO
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