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Öğe A 1- to 12-year clinical evaluation of 106 endosseous implants supporting fixed and removable prostheses(QUINTESSENCE PUBLISHING CO INC, 2007) Aykent, Filiz; İnan, Özgür; Özyeşil, Atilla Gökhan; Alptekin, Nilgün ÖzlemThe purpose of this article is to report on the long-term clinical evaluation of patients treated with dental implants. A total of 106 implants were placed in 34 patients and restored with fixed partial dentures and overdentures. The 12-year cumulative implant survival and success rates were 95.2% and 90.2%, respective Probing depths around mandibular implants were significantly lower than those around maxillary implants (P <.05). The cumulative implant success rate in nonsmokers was 97.7%, but this dropped to 75.81 % in smokers. Also, patients rehabilitated with implant-supported overdentures had more peri-implant tissue inflammation than patients with fixed prostheses.Öğe Effect of Dentin Bonding and Ferrule Preparation on the Fracture Strength of Crowned Teeth Restored With Dowels and Amalgam Cores(Mosby-Elsevier, 2006) Aykent, Filiz; Kalkan, Mustafa; Yücel, Münir Tolga; Özyeşil, Atilla GökhanStatement of problem. It is necessary to obtain an adequate bond at the core/dentin junction where the majority of failures occur. The effect of recently developed dentin bonding agents on the fracture resistance of endodontically treated teeth at the amalgam core/dentin junction is unclear. Purpose. The Purpose of this study, was to evaluate the effects of 2 dentin bonding agents and a ferrule preparation on the fracture resistance of crowned mandibular premolars incorporating prefabricated dowel and silver amalgam cores. Material and methods. Sixty extracted mandibular second premolars were divided into 6 groups of 10 each. The coronal portion of each tooth was removed at the cemento-enamel junction (CEJ) in the first 3 groups. In the other groups, teeth were sectioned 1 nun above the CEJ to create a ferrule. After root canal preparations, prefabricated dowels (ParaPost) were placed. The first group served as a control and was tested without application of bonding agents and without incorporation of a ferrule design. In the second and third groups, respectively, an autopolymerizing adhesive (Superbond D-Liner) and a dual-polymerizing adhesive (Panavia F) were applied to tooth surfaces before restorative procedures. For the fourth (ferrule) group, no bonding agent was applied, but a 1-mm ferrule preparation was used. In the fifth (ferrule+D-Liner) and sixth (ferrule+Panavia F) groups, respectively, autopolymerizing and dual-polymerizing bonding agents were used in conjunction with the ferrule preparation. After amalgam core fabrication, Ni-Cr full cast crowns for each group were prepared and cemented. All specimens were stored in water for I week and thermal cycled 1000 times between 5 degrees and 55 degrees C. A compressive shear load was applied at an angle of 135 degrees to the crown, and the maximum load at fracture (N) was recorded. The data were analyzed with 1-way ANOVA and Tukey Honestly Significant Difference tests (alpha=.05). Results. Significantly higher fracture strength values were demonstrated for the ferrule+Panavia F (652.5 N), ferrule+D-liner (649.1 N) and ferrule (592.4 N) groups, respectively, than for the other groups. The next highest fracture strength values were found for the D-Liner (485.0 N) and Panavia F (486.3 N) groups. The control group (376.6 N) demonstrated the lowest fracture strength in all test groups (P<.001). Conclusion. A ferrule preparation or a bonding agent designed for silver amalgam core-dentin bonding can each increase the fracture strength for teeth receiving cast crowns after endodontic therapy and dowel and amalgam core restorations.Öğe Estetik inleylerin marjinal adaptasyonunun incelenmesi(Selçuk Üniversitesi Sağlık Bilimleri Enstitüsü, 2000-03-09) Özyeşil, Atilla Gökhan; Kesim, BülentBu çalışmada arka grup dişlerde kullanılan üç estetik inley materyali üç farklı kompozit rezin simanla yapıştırılarak marjinal adaptasyonları açısından karşılaştırılmalı olarak değerlendirildi. Yapılan deneylerde toplam 90 adet çekilmiş çürüksüz alt molar diş kullanıldı. Standart MOD inley kavitelerin hazırlandığı dişlere IPS Empress 2, Targis ve Vitadur Alpha materyallerinden elde edilen restorasyonlar Variolink II, Panavia F ve Rely X ARC kompozit rezin simanlar kullanılarak yapıştırıldı. Simantasyon işlemi tamamlandıktan sonra 37°C'deki sentetik tükrük içinde bir gün süreyle bekletildi. Bu işlemin ardından örneklerin başlangıç marjinal adaptasyonları steriomikroskobta incelendi. Elde edilecek bulguların klinik önem taşıyabilmesi için örnekler 4 farklı yapay yaşlandırma yöntemiyle yıpratıldı ve yine marjinal adaptasyonları steriomikroskobda incelendi. Elde edilen veriler Eşleştirilmiş t Testi kullanılarak istatistiksel olarak değerlendirildi. Başlangıç ve yapay yaşlandırma sonrasındaki marjinal adaptasyon skorları arasındaki fark istatistiksel olarak anlamlı bulundu (p<0.05). Rely X ARC kompozit rezin simanla yapıştırılan örneklerin okluzal mine-siman arayüzünde restoratif materyalden bağımsız olarak ortaya çıkan farklılık istatistiksel olarak anlamlı bulundu (p<0.05). 56 Targis-Panavia F grubunda, okluzaldeki restorasyon-siman arayüzünde marjinal adaptasyon açısından istatistiksel olarak anlamlı bir fark bulundu (p<0.05). Yine Targis-Panavia F grubunda, proksimaldeki mine-siman arayüzünde marjinal adaptasyon açısından istatistiksel olarak anlamlı bir fark bulundu (p<0.05). Örneklerin tümünün proksimalindeki restorasyon-siman arayüzünde marjinal adaptasyon açısından istatistiksel olarak anlamlı bir fark bulunmadıÖğe Fracture Strength and Bending of All-Ceramic and Fiber-Reinforced Composites in İnlay-Retained Fixed Partial Dentures(Elsevıer Taıwan, 2012) Sarıdağ, Serkan; Özyeşil, Atilla Gökhan; Pekkan, GürelBackground/purpose: In the most recent decade, the use of all-ceramic and fiber-reinforced composites as inlay-retained fixed partial dentures has increased. There are limited studies of comparisons of the mechanical strength and bending of these restorations. The aim of this in vitro study was to compare the fracture strength and the amount of bending in all-ceramic and fiber-reinforced composite inlay-retained fixed partial dentures. Materials and methods: Forty mandibular premolars and 40 mandibular molars were collected. The specimens were randomly divided into four groups of 10 molars and premolars within each group, each with box-shaped proximal preparations. Two different all-ceramic systems (IPS e.max Press and ICE Zirkon) and two different fiber-reinforced composite systems (EverStick and Vectris) with a connector size of 16 mm(2) were used to restore prepared abutment teeth. After thermal cycling (5 and 55 degrees C x 5000), a vertical force was loaded to the center of the inlay-retained fixed partial dentures at a crosshead speed of 0.5 mm/min. Failure types of specimens were examined with a stereomicroscope and radiography. Statistical analysis was performed using one-way analysis of variance (ANOVA) and Mann-Whitney-U tests (alpha = 0.05). Results: Fracture strengths were significantly higher in the ICE Zirkon (1540 N) and EverStick specimens (1057 N) than in the Vectris (794 N) and IPS e.max Press specimens (606 N) (P < 0.001). The amount of bending was significantly greater in the EverStick (1.94 mm) and Vectris (1.87 mm) specimens than in the ICE Zirkon (1.07 mm) and IPS e.max Press specimens (1.18 mm) (P < 0.001). Conclusions: Zirconia-based ceramic inlay-retained fixed partial dentures demonstrated the highest fracture strength. The fiber-reinforced composite inlay-retained fixed partial dentures demonstrated higher bending values than did the all-ceramic inlay-retained fixed partial dentures. Copyright (C) 2012, Association for Dental Sciences of the Republic of China. Published by Elsevier Taiwan LLC. All rights reserved.
