Yazar "Salman, Afsin" seçeneğine göre listele

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    In Vitro Evaluation of Shear Bond Strength of Two Different Fluoride-Releasing Sealants
    (Sci Printers & Publ Inc, 2021) Dogru, Mehmet; Salman, Afsin
    OBJECTIVE: 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.
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    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, Afsin
    Purpose: 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).