Yazar "Turkaslan S.S." seçeneğine göre listele

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    Degree of conversion of luting cements under fiber-reinforced composite resins
    (University of Dicle, 2016) Turkaslan S.S.; Deger Y.
    The mechanical properties and clinical performance of cements are affected by their degree of conversion; inadequate polymerization may lead to failures. This study evaluated the polymerization proportion of a dual-cure luting cement beneath two different fiber-reinforced composite restorations of various thicknesses utilizing a degree of conversion (DC) technique. Two types of glass fiber (GF); Everstick (Stick Tec, Turku, Finland) and Vectris Frame (Ivoclar, Vivadent Schaan, Liechtenstein) were used to prepare laminate veneer simulations. The polymerization course of the composite resin luting cement (Rely X ARC/3M-ESPE) was investigated using Fourier-transformed infrared spectroscopy (FT-IR) to evaluate the quantity of remaining carbon-carbon double bonds in the specimen beneath two types of fiber-reinforced composite restorations of three thicknesses. The polymerization proportion of Rely X ARC cement beneath Everstick-reinforced composite restorations was similar to the composite-only group (p>0.005) at 0.5-, 1-, and 1.5-mm thicknesses after the light-curing period (40 sec) utilizing the DC technique. The polymerization proportion was decreased when the thickness (1 and 1.5 mm) of Vectris Frame was increased (p<0.005). The polymerization process was continued using the auto-polymerization mechanism after 1020 sec, but the 1.5-mm Vectris Frame-reinforced composite group exhibited the lowest polymerization proportion of all groups (p<0.005). In conclusion, an increased thickness of fiber-reinforced composite resin may negatively affect the polymerization proportion of the underlying resin cement, depending on the fiber material used.
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    Öğe
    Dental practitioner performance when incorporating attachments in implant-retained overdentures with unsplinted abutments
    (University of Dicle, 2015) Turkaslan S.S.; Deger Y.; Akan E.; Demirekin Z.B.; Kan S.; Uysal E.
    The aim of the present study was to evaluate the performance of dental practitioners incorporating attachments into overdenture prostheses, via the direct method, before and after an instructive course. Forty randomized gypsum models, with implants either angulated or parallel to each other, were given to forty dentists before and after an instructive course. A rubber dam or temporary light-curing composite resin was seated around the ball abutment, to avoid acrylic resin penetration while incorporating the attachments to the implant overdenture. A comparison of proportions test showed statistically significant differences between the rubber dam and temporary composite resin groups. There were no statistically significant differences between the groups with parallel and angulated abutments, before or after the course. Temporary light-curing composite resin as a block-out material is superior to a rubber dam, when incorporating attachments into the implant overdenture. The practitioners were more successful after the course, without considering the type of block-out material. The success of the practitioners was not affected by the angulation of the abutments before or after the course.