Person: YILMAZ ATALI, PINAR
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YILMAZ ATALI
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PINAR
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Publication Metadata only Thermal, spectral, and surface properties of LED light-polymerized bulk fill resin composites(WALTER DE GRUYTER GMBH, 2015) YILMAZ ATALI, PINAR; Piskin, Mehmet Burcin; Atali, Pinar Yilmaz; Figen, Aysel KanturkThe aim of this study was to evaluate the thermal, spectral, and surface properties of four different bulk fill materials - SureFil SDR (SDR, Dentsplay DETREY), QuixFil (QF, Dentsplay DETREY), X-tra base (XB, Voco) X-tra fil (XF, Voco) - polymerized by light-emitting diode (LED). Resin matrix, filler type, size and amount, and photoinitiator types influence the degree of conversion. LED-cured bulk fill composites achieved sufficient polymerization. Scanning electron microscope (SEM) analysis revealed different patterns of surface roughness, depending on the composite material. Bulk fill materials showed surface characteristics similar to those of nanohybrid composites. Based on the thermal analysis results, glass transition (T-g) and initial degradation (T-i) temperatures changed depending on the bulk fill resin composites.Publication Metadata only Effect of sodium ascorbate and delayed treatment on the shear bond strength of composite resin to enamel following bleaching(WOLTERS KLUWER MEDKNOW PUBLICATIONS, 2016) TÜRKMEN, CAFER; Turkmen, C.; Guleryuz, N.; Atali, P. Y.Background: The effect of bleaching on enamel surfaces, as well as exploring methods of preventing the weakening of bond strength of two different adhesives to bleached enamel surfaces. Objective: This study compared the shear bond strength (SBS) of two different adhesives on bleached enamel immediately after bleaching, with a 1-week delay, and following application of an antioxidizing agent after bleaching. Materilas and Method: The enamel surfaces of 140 incisors were divided into 14 groups. Two unbleached enamel groups (n = 20) were prepared as negative controls of the Adper Single Bond 2 total-etch and Clearfil Tri S Bond self-etch adhesives. The remaining surfaces were randomly divided into two bleaching groups treated with 35% Beyond Max (n = 60) and 38% Opalescence Xtra Boost (n = 60). Each bleaching group was then divided into two subgroups using the total and self-etch adhesive systems. Specimens were bonded immediately after bleaching, after treatment with 10% sodium ascorbate (SA) gel, or after 1-week of immersion in artificial saliva. All groups were restored with composite resin. After thermocycling, SBS was measured and data were analyzed. Results: In the control groups, there was no statistically-significant difference in SBS between self-and total-etch adhesives. Among all bleaching groups, no statistically-significant differences in SBS were noted, although the SA-treated delayed bonding (1-week) groups had the highest values. The lowest values were noted for the groups bonded immediately after bleaching.Publication Metadata only Full in-vitro analyses of new-generation bulk fill dental composites cured by halogen light(ELSEVIER SCIENCE BV, 2017) YILMAZ ATALI, PINAR; Tekin, Tuce Hazal; Figen, Aysel Kanturk; Atali, Pinar Yilmaz; Filiz, Bilge Coskuner; Piskin, Mehmet BurcinThe objective of this study was to investigate the full in-vitro analyses of new-generation bulk-fill dental composites cured by halogen light (HLG). Two types' four composites were studied: Surefill SDR (SDR) and Xtra Base (XB) as bulk-fill flowable materials; QuixFill (QF) and XtraFill (XF) as packable bulk-fill materials. Samples were prepared for each analysis and test by applying the same procedure, but with different diameters and thicknesses appropriate to the analysis and test requirements. Thermal properties were determined by thermogravimetric analysis (TG/DTG) and differential scanning calorimetry (DSC) analysis; the Vickers microhardness (VHN) was measured after 1,7, 15 and 30 days of storage in water. The degree of conversion values for the materials (DC, %) were immediately measured using near-infrared spectroscopy (FT-IR). The surface morphology of the composites was investigated by scanning electron microscopes (SEM) and atomic-force microscopy (AFM) analyses. The sorption and solubility measurements were also performed after 1, 7, 15 and 30 days of storage in water. In addition to his, the data were statistically analyzed using one-way analysis of variance, and both the Newman Keuls and Tukey multiple comparison tests. The statistical significance level was established at p < 0.05. According to the ISO 4049 standards, all the tested materials showed acceptable water sorption and solubility, and a halogen light source was an option to polymerize bulk-fill, resin-based dental composites. (C) 2017 Elsevier B.V. All rights reserved.Publication Metadata only Thermal properties and kinetics of new-generation posterior bulk fill composite cured light-emitting diodes(SPRINGER, 2014) YILMAZ ATALI, PINAR; Figen, Aysel Kanturk; Atali, Pinar Yilmaz; Piskin, Mehmet BurcinIn this study, the thermal behavior in terms of glass transition (T (g)), degradation, and thermal stability of four commercial new-generation posterior bulk fill composites (Surefill SDR, Dentsply; Quixfill, Dentsply; Xtrabase, Voco; and Xtrafill, Voco) activated by light-emitting diodes (LEDs) was analyzed by thermogravimetric analysis (TG), differential scanning calorimetry (DSC), and dynamic mechanical analysis (DMA). The activation energies (E (a)) for the decomposition of the dental resins were calculated based on the Kissinger and Doyle kinetic models from the peaks of the endothermic curves obtained when the specimens were heated at four different temperatures (5, 10, 15, and 20 A degrees C min(-1)) during DSC. The results show that the Xtrabase composite displayed the highest T (g) (120 A degrees C at a 5 A degrees C min(-1) heating rate) and E (a) (157.64 kJ mol(-1)) values associated with thermal degradation from the main chain of the polymer.Publication Open Access Aesthetic Rehabilitation of Enamel Hypomineralization with Microabrasion and Direct Composites (18 Month-Follow-up Report)(MARMARA UNIV, INST HEALTH SCIENCES, 2019-08-31) KORKUT, BORA; Dokumacigil, Gokhan; Korkut, Bora; Atali, Pinar Yilmaz; Topbasi, Faik BulentObjective: This case report represents a direct, prepless treatment of discolored anterior teeth due to Molar-Incisor Hypomineralisation (MIH) defect following microabrasion and vital bleaching. Methods: Following clinical and radiological examinations, the discolored, teeth were microabraded with a microabrasive agent containing 6.6% HCI (hydrochloric acid) and silicone carbide particles. Then the teeth were bleached by using 40% hydrogen peroxide. Finally direct composite restorations were performed with A2 shade. Polishing procedure was done by using polishing discs and spiral wheels. Result: The restorations were evaluated in terms of retention, marginal integrity, marginal discoloration, anatomical form, secondary caries, surface texture, shade match, and postoperative sensitivity according to 'The Modified United States Public Health Service' (USPHS) criterias at 3rd, 9th and 18th months. Nevertheless, it was detected slight abrasion at 18-month follow-up on the labial surfaces of teeth #11 and #21, all the scores were considered as acceptable. Conclusion: The microabrasion, vital bleaching and direct composite restoration combination is considered as a promising treatment method for MIH effected teeth under the conditions of this study.