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Öğe Bonding Strength to Two Different Surfaces of Dentin Under Simulated Pulpal Pressure(2001) Belli, Sema; Ünlü, N.; Özer, F.Purpose: The purpose of this in vitro study was to measure and compare the in vitro shear bond strengths (SBS) of the following dentin bonding systems to different dentin surfaces under simulated pulpal pressure: Liner Bond 2 (self-etching) (LB2), Liner Bond 2V (self-etching) (LB2V), Opti Bond Solo (single component) (OBS), Fuji Bond LC (filled) (FBLC), Prime & Bond 2-1 (single component) (P&B2-1), and Solid Bond (total etching) (SB). Materials and Methods: Occlusal and buccal surfaces of 60 extracted human molars were prepared to expose the dentin bonding surface. After being wet ground with 600-grit abrasive papers, teeth were randomly assigned to 6 equal groups of 10 each. The dentin surfaces were treated with the bonding systems mentioned above, and resin composite cylinders (Clearfil AP-X) were built up under simulated pulpal pressure when diluted bovine serum was used as the pulpal fluid. After one day of storage in 37°C water, the specimens were shear tested to failure on an Instron machine. Results: The data were statistically analyzed with the Student's t-test and a post hoc Tukey test. Comparing buccal surfaces, the post hoc Tukey test indicated no significant differences among all the test groups (p > 0.05). On occlusal surfaces, the post hoc Tukey test indicated significant differences among the tested groups (p < 0.05). The Student's t test revealed significant differences between the occlusal and buccal shear bond strength values in LB 2, LB2V, and SB groups (p < 0.05). Conclusion: The strength of adhesion to dentin depends upon both the adhesive system used - with selfetching systems tending to show higher bond strengths than the other materials tested - and the location of the dentin, with significantly higher SBS being found on buccal surfaces in 3 of the 7 tested bonding systems.Öğe Effect of Cavity Varnish, Amalgam Liner or Dentin Bonding Agents on the Marginal Leakage of Amalgam Restorations(BLACKWELL SCIENCE LTD, 2001) Belli, S.; Ünlü, N.; Özer, F.The purpose of this in vitro study was to compare marginal leakage of Class II amalgam restorations lined with different agents (two new generation dentin bonding systems, a cavity varnish and an amalgam liner). Forty freshly extracted human molar teeth were divided into five groups. Class II preparations were prepared in the mesial and distal surfaces of each molar. While the cavities in two groups were lined with two new generation bonding systems, the other two groups were treated with an amalgam lining material and a cavity varnish. Fifth group was used as control, without any lining. Amalgam was hand-condensed into each preparation. Specimens were thermocycled, stained and sectioned. Microleakage was graded using a stereomicroscope. Mean microleakage scores for occlusal and cervical margins were calculated and analised. For the leakage values on occlusal margins, Kruskal-Wallis test indicated no significant difference in all groups. For the leakage values on cervical margins, Kruskal-Wallis test indicated significant difference in four groups when compared with controls (P < 0.001). On the other hand, there was no significant difference between the occlusal and cervical leakage values in each group.Öğe Gökpınar Barajı (Denizli) dolusavak ve eşik yapısı temel zemininde yapılan jeoteknik çalışmalar(Selçuk Üniversitesi Mühendislik-Mimarlık Fakültesi, 2007) Beyaz, T.; Ünlü, N.; Akgün, M.Su kaynaklarının ekonomiye kazandırılması amacıyla baraj, gölet, regülatör ve sulama ana kanalları gibi yapılar inşa edilmektedir. Büyük miktardaki suyun kontrol altında tutulmasını gerektiren bu tür mühendislik yapılarının uzun yıllar kullanılabilmesi; üzerine inşa edileceği jeolojik birimlerin jeoteknik özelliklerinin iyi belirlenerek buna uygun proje tasarımı ve zemin iyileştirmesi yapılmasına bağlıdır. Bu çalışmada, Gökpınar Barajı (Denizli) dolusavak ve eşik yapısı temel zemininde yapılan saha incelemeleri ile temel sondajı ve presiyometre deneylerinin sonuçlarına göre yapılan jeoteknik iyileştirme önlemlerin belirlenmesi amaçlanmaktadır. Baraj alanındaki jeolojik birimlerin jeolojisi ile dolusavak ve eşik yapısının altındaki birimlerin mühendislik özellikleri hakkında bilgiler verilmiştir. Dolusavak ve eşik yapısının oturacağı birimlerin taşıma gücü ve oturma hesaplarına yönelik olarak yerinde (in-situ) presiyometre ve çekme deneyleri yapılmış; bu deneylerin sonuçları yorumlanarak, inşa edilecek yapıdan gelecek yük ile zeminin emniyetli taşıma gücü karşılaştırılmıştır. Zayıf taşıma gücüne sahip birimlerin güçlendirilmesi için alınması gereken önlemler ve güçlendirme işlemleri (zemin sağlamlaştırma enjeksiyonu, ankraj çalışması vb) hakkında bilgiler verilmiştir.Öğe Restorative and periodontic interdisciplinary approach in the treatment of periodontal abscess: Case report.(INT AMER ASSOC DENTAL RESEARCHI A D R/A A D R, 2003) Çağlı, N. A.; Ünlü, N.; Alptekin, Nilgün Özlem[Abstract not Available]
