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    Evaluation of Degree of Conversion, Flexural Strength, and Microhardness of a Novel Flowable Resin Composite
    (Selcuk University, 2025) Doğu Kaya, Bengü; Öztürk, Selinsu; Kuzu, Nazlı Zeynep; Senol, Ayse Aslı; Kahramano?lu, Erkut; Yılmaz Atalı, Pınar; Tarcin, Bilge
    Aim: This in vitro study aimed to evaluate the degree of conversion, and to compare the flexural strength, and microhardness of two flowable resin composites with different filler ratio. Materials & Methods: Two flowable composite resins were used in this study, ZENIFLOW (65% filler by volume) and Dynamic flow (60% filler by volume) (President, Germany). Disc-shaped specimens were prepared from each material using silicone molds (8 x 2). All specimens were polymerized with an LED curing unit (Valo Cordless, Ultradent, USA) at 1000 mW/cm2 for 20 s. Polishing procedures were performed with 4-stage finishing discs (BISCO, USA). Vickers microhardness values (VHN) (n=5) and hardness ratio (HR) of these samples were determined from the top/bottom surfaces with a microhardness tester after being stored in distilled water at 37ºC for 15 days. Degree of conversion (DC) was evaluated using Fourier Transform Infrared Spectroscopy (FTIR) (n=5). Rectangular specimens (25 x 2 x 2) were prepared and subjected to three-point bending test (n=10) to determine flexural strength (FS) and flexural modulus (FM). After the flexural strength evaluation, the fractured surfaces were examined by stereomicroscope (Leica MZ7.5, Germany) and Scanning Electron Microscope (SEM) (Zeiss EVO MA10, Germany). Independent sample t-test was used to compare the values between groups. The significance level was determined as p<0.05. Results: There was no significant difference between the two resin composites with different filler ratios in terms of degree of conversion, microhardness, hardness ratio, flexural strength, and flexural modulus. Conclusion: A 5% increase in the volume of filler content did not alter the degree of conversion and the tested mechanical properties of the resin composite. © 2025, Selcuk University. All rights reserved.
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    Evaluation of dental students' attitude to elderly patients based on demographic data: a cross-sectional study
    (Bmc, 2025) Gencer, Buesra Karabulut; Senol, Ayse Asli; Kaya, Bengue Dogu; Atali, Pinar Yilmaz; Tarcin, Bilge
    BackgroundComprehensive curricular modifications in dental education are essential to address the healthcare needs of the growing geriatric population. In this context, incorporating attitudes of dental students towards this complex patient group into the design of educational programs is crucial for developing effective curricula. The aim of this study was to evaluate the attitudes of dental students towards elderly patients during their educational progress, which is a crucial period in the formation of dentists' approaches to patients and treatment, and to consider the influence of demographic data in this process.MethodsIn this cross-sectional study, a two-part questionnaire was administered to 3rd-, 4th-, and 5th-year students at Marmara University, Faculty of Dentistry. The first part collected demographic data on age, gender, place of residence, presence of grandparents, and history of living with grandparents. The second part used the validated Ageism Scale for Dental Students (ASDS) with 5 items on a 6-point Likert scale. Mann-Whitney U and Kruskal-Wallis tests were used for two- and multi-group comparisons, respectively, and the Spearman Correlation Test examined age-scale score relationships. A Type 1 error rate of 0.05 was applied.ResultsA total of 305 students participated, 204 (66.9%) of whom were female. The distribution across the 3rd, 4th, and 5th years was 35.1%, 32.1%, and 32.8%, respectively. The median ASDS score was 3.2. No significant differences in ASDS scores were found concerning age (p = 0.925), gender (p = 0.631), year of study (p = 0.581), place of residence (p = 0.282), presence of grandparents (p = 0.199), or history of living with grandparents (p = 0.859).ConclusionDemographic factors did not significantly affect ASDS scores. Larger, translated, and validated studies in different regions of T & uuml;rkiye are needed. However, the neutral attitudes observed among students suggest that the content of geriatrics in dentistry education should be strengthened in a way that promotes positive attitudes towards elderly patients.
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    Evaluation of fracture resistance and crack propensity of bulk-fill composite restorations reinforced by polyethylene fiber
    (Bmc, 2025) Senol, Ayse Asli; Manav, Aybike; Dogu Kaya, Bengu; Yilmaz Atali, Pinar; Kahramanoglu, Erkut; Tarcin, Bilge; Turkmen, Cafer
    Background In clinical restorative applications, different materials and techniques are used to replace lost tooth tissue and compensate for the fracture resistance that are essential for function. Further investigation is required to ascertain the effect of polyethylene fiber application, which is one of these interventions, on the fracture resistance, fracture location, reparability and crack propagation of premolar teeth restored with direct composite resin restorations. This in-vitro study aimed to evaluate fracture resistance and crack propagation of two bulk-fill composites (BRC) with/without polyethylene-fiber in extensive Class I resin composite restorations. Methods Cavities were prepared on 40 mandibular premolars. In half of the samples (n = 20), polyethylene-fiber (Ribbond Fiber/RF) coated with adhesive resin was placed on cavity floor. Half of the teeth were restored with SonicFill 3 and the other half with Charisma Bulk Flow ONE.The groups were as follows: SonicFill 3 + Fiber(SF + RF), SonicFill 3(SF), Charisma Bulk Flow ONE + Fiber(CO + RF), and Charisma Bulk Flow ONE(CO). Following 20,000 thermo-cycles fracture resistance (FR) was determined. Crack number/orientation were assessed with transillumination using two different wavelengths, before (t(0)) and after preparation (t(p)), and following fracture test (t(f)).Visual examination was performed with micro-CTto evaluate the adaptation. Data were analyzed using Independent samplesT-test, Fisher's Exact, Fisher Freeman Halton, Pearson Chi-Square and Cochran's QTests (P < .05). Results No statistically significant difference was found between the FR of groups (P = .994) with and without RF (P = .167) according to BRC. The mean FR values in decreasing order were CO (761.09 +/- 224.32) > SF + RF (671.08 +/- 150.51) > CO + RF (669.95 +/- 358.44) > SF (580.7 +/- 269.04). A reduction in the formation of irreparable fracture patterns was detected in RF groups. Crack number/orientation did not differ according to BRC and RF application. Statistically significant increase was observed in crack formation over examination periods (t(f)> t(p)> t(0); P < .001). Conclusions The reinforcement of large cavities with polyethylene fibers changed the fracture pattern of the restorations towards repairable, whereas had no effect on fracture resistance and crack formation. Furthermore, the placement of polyethylene fibers may have an adverse effect on the adaptation of the cavity. In clinical applications, both wavelengths can be used for transillumination testing in crack inspection.