Browsing by Author "Özcan, M"

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    Microshear Bond Strength and Finite Element Analysis of Resin Composite Adhesion to Press-on-Metal Ceramic for Repair Actions after Various Conditioning Methods
    Kanat, B; Çömlekoglu, ME; Çömlekoglu, MD; Çulha, O; Özcan, M; Güngör, MA
    Purpose: This study evaluated the repair bond strength of differently surface-conditioned press-on-metal ceramic to repair composites and determined the location of the accumulated stresses by finite element analysis. Materials and Methods: Press-on-metal ceramic disks (IPS InLine PoM, lvoclar Vivadent) (N = 45, diameter: 3 mm, height: 2 mm) were randomly divided into 3 groups (n = 15 per group) and conditioned with one of the following methods: 9.5% hydrofluoric acid (HF) (Porcelain etch), tribochemical silica coating (TS) (CoJet), and an unconditioned group acted as the control (C). Each group was divided into three subgroups depending on the repair composite resins: a) Arabesk Top (V, a microhybrid; VOCO), b) Filtek Z250 (F, a hybrid;3M ESPE); c) Tetric Evo-Ceram (T, a nanohybrid; lvoclar Vivadent) (n = 5 per subgroup). Repair composites disks (diameter: 1 mm, height: 1 mm) were photopolymerized on each ceramic block. Microshear bond strength (MSB) tests were performed (1 mm/min) and the obtained data were statistically analyzed using 2-way ANOVA and Tukey's post-hoc test (alpha = 0.05). Failure types were analyzed under SEM. Vickers indentation hardness, Young's modulus, and finite element analysis (FEA) were performed complementary to MSB tests to determine stress accumulation areas. Results: MSB results were significantly affected by the surface conditioning methods (p = 0.0001), whereas the repair composite types did not show a significant effect (p = 0.108). The interaction terms between the repair composite and surface conditioning method were also statistically significant (p = 0.0001). The lowest MSB values (MPa +/- SD) were obtained in the control group (V = 4 +/- 0.8; F = 3.9 +/- 0.7; T = 4.1 +/- 0.7) (p < 0.05). While the group treated with T composite resulted in significantly lower MSB values for the HF group (T = 4.1 +/- 0.8) compared to those of other composites (V = 8.1 +/- 2.6; F = 7.6 +/- 2.2) (p < 0.05), there were no significant differences when TS was used as a conditioning method (V = 5 +/- 1.7; F = 4.7 +/- 1; T = 6.2 +/- 0.8) (p > 0.05). The control group presented exclusively adhesive failures. Cohesive failures in composite followed by mixed failure types were more common in HF and TS conditioned groups. Elasticity modulus of the composites were 22.9, 12.09, and 10.41 GPa for F, T, and V, respectively. Vickers hardness of the composites were 223, 232, and 375 HV for V, T, and F, respectively. Von Mises stresses in the FEA analysis for the V and T composites spread over a large area due to the low elastic modulus of the composite, whereas the F composite material accumulated more stresses at the bonded interface. Conclusion: Press-on-metal ceramic could best be repaired using tribochemical silica coating followed by silanization, regardless of the repair composite type in combination with their corresponding adhesive resins, providing that no cohesive ceramic failure was observed.
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    Prevalence and predictors of gestational diabetes mellitus: a nationwide multicentre prospective study
    Aydin, H; Çelik, Ö; Yazici, D; Altunok, Ç; Tarçin, Ö; Deyneli, O; Sancak, S; Kiyici, S; Aydin, K; Yildiz, BO; Çakiroglu, AY; Özer, A; Tuzcu, AK; Kan, A; Çelik, A; Uysal, A; Atmaca, A; Evren, B; Taskiran, B; Bilir, BE; Duran, C; Arpaci, D; Tüzün, D; Kavak, EÇ; Aydeniz, E; Akbas, EM; Üstünyurt, E; Bil, E; Güney, E; Akbaba, E; Gürkan, E; Çagliyan, E; Karakiliç, E; Karakas, E; Kilinç, F; Söylemez, F; Küçükler, FK; Yorulmaz, G; Akbaba, G; Uysal, G; Kurt, G; Yaylali, GF; Selimoglu, H; Sari, H; Piskinpasa, H; Çelik, H; Peynirci, H; Bilal, I; Sahin, I; Gözükara, I; Anaforoglu, I; Senyuva, I; Ugur, K; Dogan, K; Keskin, L; Mert, M; Adas, M; Tonguç, M; Eroglu, M; Kulaksizoglu, M; Özcan, M; Çinar, N; Kutbay, NÖ; Dikbas, O; Bakiner, O; Turhan, ÖT; Tütüncüoglu, P; Sari, R; Melekoglu, R; Ayaz, R; Emral, R; Mumusoglu, S; Görar, S; Keskek, SÖ; Tosun, SA; Çetinkaya, SE; Temizkan, S; Ünsal, S; Demir, T; Yüce, T; Aksoy, Ü; Çinkir, Ü; Simsek, Y; Uyar, Y; Türk, Y; Pekkolay, Z; Hekimsoy, Z; Cantürk, Z; Üç, ZA
    Aim Prevalence rates of gestational diabetes mellitus (GDM) show considerable variation among different countries and regions of the world. The primary aim of this study was to determine the nationwide prevalence and predictors of GDM in Turkey. Methods We conducted prospective nationwide screening among pregnant women. Between August 2016 and November 2017, a total of 2643 pregnant women from 51 centres in 12 different regions were enrolled. A two-step screening method and Carpenter and Coustan criteria were used in the diagnosis of GDM. Clinical and biochemical data were obtained using electronic database software. Results The national prevalence of GDM was found to be 16.2% [95% confidence intervals (CI) 15.0% to 17.4%] without a significant difference between urban and rural regions. Women with GDM were older (mean age: 32 +/- 5 vs. 28 +/- 5 years, P < 0.001) and heavier (mean BMI: 27.2 +/- 5.1 vs. 24.7 +/- 4.7 kg/m(2), P < 0.001) than their counterparts without GDM. The prevalence of GDM tended to increase with age (< 25 years, 6.9%; 26-35 years, 15.6%; and 36-45 years, 32.7%; P < 0.001). Maternal age, maternal BMI, history of previous GDM and family history of diabetes mellitus were independent predictors of developing GDM (P < 0.05 for all). Low-risk women (age < 25 years, BMI < 25 kg/m(2), no family history of diabetes) comprised 10.7% of the total population and the prevalence of GDM in these women was 4.5% (95% CI 2.4% to 7.8%). Conclusion The results of this nationwide study indicate that GDM is very common, affecting one in seven pregnancies in Turkey. Implementation of international guidelines on screening and management of this public health problem is required.
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    Turkish Guideline for Diagnosis and Treatment of Allergic Rhinitis (ART)
    Ecevit, MC; Özcan, M; Can, IH; Tatar, EC; Özer, S; Esen, E; Atan, D; Göde, S; Elsurer, C; Eryilmaz, A; Coskun, BU; Yazici, ZM; Dinç, ME; Ozdogan, F; Gunhan, K; Bilal, N; Korkut, AY; Kasapoglu, F; Türk, B; Server, EA; Çelebi, ÖÖ; Simsek, T; Kum, RO; Adali, MK; Eren, E; Aslier, NGY; Bayindir, T; Çetin, AC; Göker, AE; Güvenç, IA; Köseoglu, S; Özler, GS; Sahin, E; Yilmaz, AS; Güne, C; Yildirim, GA; Öca, B; Durmusoglu, M; Kantekin, Y; Özmen, S; Kubat, GO; Sanal, SK; Altuntas, EE; Selçuk, A; Yazici, H; Baklaci, D; Yaylaci, A; Hanci, D; Dogan, S; Fidan, V; Uygur, K; Keles, N; Cingi, C; Topuz, B; Çanakçioglu, S; Önerci, M
    Object: To prepare a national guideline for Oto-rhinolaryngologist who treat allergic rhinitis patients Methods: The study was conducted by three authors, namely the writing support team. The support team made the study plan, determined the writing instructions, chose the subgroups including the advisory committee, the advisors for authors and the authors. A workshop was organized at the very beginning to explain the details of the study to the team. Advisors took the chance to meet their coworkers in their subgroups and determined the main headings and subheadings of the guideline, together with the authors. After key words were determined by the authors, literature search was done in various databases. The authors keep in touch with the advisors and the advisors with the advisory committee and the support group at every stage of the study. National and International published articles as well as the abstracts of unpublished studies, imperatively presented in National Congresses, were included in this guideline. Only Guideline and meta-analyses published in last seven years (2013- 2017) and randomized controlled studies published in last two years (2015- 2017) were included. After all work was completed by the subgroups, support team brought all work together and edited the article. Results: A detailed guideline about all aspects of allergic rhinitis was created. Conclusion: The authors believe that this guideline will enable a compact and up-to-date information on allergic rhinitis to healthcare professionals. This guideline is the first in the field of Otolaryngology in Turkey. It should be updated at regular intervals.