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Öğe In Vitro Evaluation of Shear Bond Strength of Two Different Fluoride-Releasing Sealants(Sci Printers & Publ Inc, 2021) Dogru, Mehmet; Salman, AfsinOBJECTIVE: To evaluate shear bond strength of 2 different fluoride-releasing sealants and their adhesive remnant index (ARI). STUDY DESIGN: A total of 105 extracted human maxillary premolars were divided into 3 groups of 35. Slot brackets (0.018-inch) were bonded to buccal surfaces of teeth using Pro Seal, Opal Seal, and, as a control group, Transbond XT. Transbond XT Composite was used only as an adhesive material. All samples were subjected to thermocycling for 5,000 cycles in water baths between 5 degrees C and 55 degrees C. Subsequently, the shear bond strengths of specimens were determined under loads vertically at 0.5 mm/min crosshead speed until rupture occurred. After the shear bond strength test, specimens were examined with a stereomicroscope at x20 magnification and grouped according to ARI analysis. Statistical analyses were performed using one-way ANOVA analysis of variance for shear bond strength data and Kruskal-Wallis and Mann-Whitney U tests for ARI analysis. RESULTS: There was no significant difference between all the groups (p>0.05) with regard to shear bond strength. According to ARI analyses, the control group was statistically different from both the Pro Seal and Opal Seal groups (p <0.05). However, there was no significant difference between the Pro Seal and Opal Seal groups for ARI analyses. CONCLUSION: The results of this study showed that the potential of caries and white spot lesions during orthodontic treatment can be decreased by using new fluoride-releasing sealants. However, this is an in vitro study and these results should be supported with clinical studies.Öğe Influence of different cavity preparation designs on fracture resistance of onlay and overlay restorations using different CAD/CAM materials(Mosher & Linder, Inc, 2017) Salman, Gizem On; Tacir, Ibrahim Halil; Polat, Zelal Seyfioglu; Salman, AfsinPurpose: To evaluate fracture strength of different preparation designed onlay and overlay restorations produced by Computer Aided Design/Computer Aided Manufacturing (CAD/CAM) and three different new ceramic polymer blocks. Methods: Ninety-one extracted human mandibular molars were used in this study. Preparations were made as (1) Only functional cusps reduction, (2) Only functional cusps reduction+rounded shoulder finish line, (3) All cusps reduction, or (4) All cusps reduction+rounded shoulder fmish line. Then these four cavity types were restored with three different materials: VITA Enamic, GC Cerasmart, Lava Ultimate. Thirteen groups were created by added control group (n= 7). Adhesive cementation was achieved by using a dual cured composite resin adhesive cement RelyX Ultimate. All samples were subjected to thermocycling for 5,000 cycles in water baths between 50 degrees C and 55 degrees C. The fracture resistance of specimens was determined under compressive loads along the long axis of the restored teeth at 0.5 mm/minute crosshead speed until fracture with a universal test machine. Fracture types of restored groups were evaluated. For fracture resistance data, one-way ANOVA; for correlation between material type and preparation design, two-way ANOVA were used. Percentage table and Kruskal-Wallis test were performed for analysis of fracture types. Results: There was no significant difference between all the groups (one-way ANOVA, P> 0.05). Group 4 showed statistically higher fracture strength values than Group 1 and no significant difference was found among other preparation designs by two-way ANOVA that compared all types of preparation designs regardless of material difference (P< 0.05).