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BackgroundThe aim of this study was to analyze the bond strength of aged resin based nanocomposites repaired with the same and bulk fill composites.Material and MethodsSeventy-two disc shaped resin composites consisted of three different nanocomposite resins (Filtek Ultimate/FU, Herculite XRV Ultra/HXRV, and Reflectys/R) were produced. After storing the samples for 8 weeks in distilled water, each material was combined with the same material or the bulk-fill composite resin system (Filtek Ultimate+Filtek Ultimate/Group-1; Filtek Ultimate+Tetric BF/Group-2; Herculite XRV+Herculite XRV/Group-3; Herculite XRV+Tetric BF/ Group-4; Reflectys+Reflectys/Group 5; Reflectys+Tetric BF/Group-6), for repair. Then specimens were subjected to shear bond strength testing(SBS), and the debonded surfaces were examined.ResultsThere was a significant difference among three materials(repaired with itself+bulk fill) for SBS testing values (p=0.001). FU and R were found to be similar, while HXRV was significantly different from them. A significant difference between group-1 and 2 (p=0.006) was detected, while there were no differences between group 3 and 4 (p= 0.142), and 5 and 6 (p=0.346). Among the six groups, repair SBS testing values with TBF were higher than repair with itself except for FU.ConclusionsThe bulk-fill repaired materials showed higher bond strength except for FU, which showed the highest SBS value when repaired with itself. An increased incidence of adhesive fracture was observed at low strengths. Key words:Resin-based composites, nanofillers, surface treatment, macro-shear, repair.

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Objective: The aim of this cross-sectional study is to investigate Turkish dentists’ opinions and preferences regarding the management of deep carious lesions and compare them with modern dental education concepts as provided by dental schools. Methods: Questionnaire 1 and Questionnaire 2 were sent separately to dental practitioners via the Turkish Dental Association and to university department heads of restorative dentistry. The data obtained were analyzed using chi-square tests and one-way ANOVA tests (p < 0.05). Results: Regarding Questionnaire 1, most of the dentists (89.3%) responded that caries lesions should be removed completely up to the hard cut-off condition of the cavity floor. There was a statistically significant difference between female and male dentists’ preferences on less invasive treatment (p < 0.05). Female dentists prefer less invasive treatment compared with male dentists (p = 0.002). Relatively older dentists (mean age = 41.8) are more inclined towards complete caries removal even if pulp exposure is likely (p = 0.040). The results of Questionnaire 2 reveal that there is no association between the time spans of education at dental schools and their caries removal approach curriculum (p > 0.05). Most department heads of restorative dentistry prefer to apply complete caries removal (78.5%, n = 51). Conclusion: Despite today’s curriculum encouraging less invasive caries removal techniques, most dentists prefer more invasive treatment options. Continuous education of contemporary dentistry could update these clinical treatment attitudes of dentists and improve their clinical practice.