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  • Küçük Resim
    Öğe
    Effect of different palatal vault shapes on the dimensional stability of glass fiberreinforced heat-polymerized acrylic resin denture base material
    (Dental Investigations Society, 2012) Dalkiz, Mehmet; Arslan, Demet; Tuncdemir, Ali Riza; Selim Bilgin, M.; Aykul, Halil
    Objective: The aim of this study was to determine the effect of different palatal vault shapes on the dimensional stability of a glass fiber reinforced heat polymerized acrylic resin denture base material. Methods: Three edentulous maxilla with shallow, deep and medium shaped palatal vaults were selected and elastomeric impressions were obtained. A maxillary cast with four reference points (A, B, C, and D) was prepared to serve as control. Point (A) was marked in the anterior midline of the edentulous ridge in the incisive papillary region, points (B) and (C) were marked in the right and left posterior midlines of the edentulous ridge in the second molar regions, and point (D) was marked in the posterior palatal midline near the fovea palatina media (Figure 2). To determine linear dimensional changes, distances between four reference points (A-B, A-C, A-D and B-C) were initially measured with a metal gauge accurate within 0.1 mm under a binocular stereo light microscope and data (mm) were recorded. Results:No significant difference of interfacial distance was found in sagittal and frontal sections measured 24 h after polymerization and after 30 days of water storage in any of experimental groups (P>.05). Significant difference of linear dimension were found in all experimental groups (P<.01) between measurements made 24 h after polymerization of specimens and 30 days after water storage. Conclusion: Palatal vault shape and fiber impregnation into the acrylic resin bases did not affect the magnitude of interfacial gaps between the bases and the stone cast surfaces.
  • [ N/A ]
    Öğe
    EVALUATION OF THE EFFECTS OF SURFACE TREATMENTS ON DIFFERENT DENTAL CERAMIC STRUCTURES
    (Inst Za Kovinske Materiale I In Tehnologie, 2013) Erturk, Ergul; Dalkiz, Mehmet; Ozyilmaz, Emre; Akbas, H. Zehra; Cetinkara, H. Ali; Aykul, Halil
    The surface treatments applied to porcelain materials can be different overglaze methods, chemical interactions and polishing techniques. The aims of these methods are the most durable restoration and the smoothest surface. The smoothness attained with these processes is important due to the following reasons: reduction of the bacteria remaining in the pores of a surface, improvement of gingival health and esthetic view, and prevention of an abrasion of the opposite canal. The aim of this study is to assess different surface-finishing operations that are applied to widely used porcelains in prosthetic dentistry using SEM (a scanning electron microscope). In the experiments seven different surface finishing operations (sandpaper, rubber, Sof-Lex, HP paste, autoglaze, overglaze and ion exchange) were applied to four different commercial porcelains (IPS d. SIGN, Antagon, Ceramco 3, Vitadur Alpha). The effects of various surface-finishing operations on porcelain are micromorphologically evaluated (a SEM analysis). The results showed that the smoothest surfaces were obtained with the overglaze and autoglaze, followed by HP paste, rubber, Sof-Lex and sandpaper. In addition, the smoothness values of HP paste proved that it can be safely used in clinical surface-finishing operations.
  • [ N/A ]
    Öğe
    Evaluation of the effects of surface treatments on different dental ceramic structures
    (2013) Ertürk, Ergül; Dalkiz, Mehmet; Özyilmaz, Emre; Zehra Akbaş, H.; Ali Çetinkara, H.; Aykul, Halil
    The surface treatments applied to porcelain materials can be different overglaze methods, chemical interactions and polishing techniques. The aims of these methods are the most durable restoration and the smoothest surface. The smoothness attained with these processes is important due to the following reasons: reduction of the bacteria remaining in the pores of a surface, improvement of gingival health and esthetic view, and prevention of an abrasion of the opposite canal. The aim of this study is to assess different surface-finishing operations that are applied to widely used porcelains in prosthetic dentistry using SEM (a scanning electron microscope). In the experiments seven different surface finishing operations (sandpaper, rubber, Sof-Lex, HP paste, autoglaze, overglaze and ion exchange) were applied to four different commercial porcelains (IPS d. SIGN, Antagon, Ceramco 3, Vitadur Alpha).The effects of various surface-finishing operations on porcelain are micromorphologically evaluated (a SEM analysis). The results showed that the smoothest surfaces were obtained with the overglaze and autoglaze, followed by HP paste, rubber, Sof-Lex and sandpaper. In addition, the smoothness values of HP paste proved that it can be safely used in clinical surface-finishing operations.
  • Küçük Resim
    Öğe
    Investigation of the effects of abutment and implant length on stability of short dental implants
    (2014) Özyılmaz, Eda; Aykul, Halil; Özyılmaz, Emre; Dalkız, Mehmet; Bilgin, Mehmet Burak
    Diş hekimliğinde bulunan farklı sorunları çözmek için dental implantların kullanımı hızla artmaktadır. Dental implantların başarı oranları da hastalar için oldukça önemlidir. Kısa dental implantlar, hastaların kemik seviyesine bağlı olarak çok popüler ve yaygın olarak pek çok diş hekimleri tarafından kullanılmaktadır. Birçok diş hekimi sık sık kısa diş implantları kullanmasına rağmen, implant-kron oranlarından dolayı stabilite sorunlarının gerçekleşebileceği tahmin edilebilir. Bu çalışmada, implant ve abutment uzunluklarının kısa dental implantlardaki stabilite üzerine etkilerinin incelenmesi amaçlanmıştır. Üç farklı kısa implant tasarımı Solidworks 2013 programı kullanılarak tasarlanmıştır. Her bir model için abutment uzunlukları 3,5 mm, 4 mm, 4,5 mm ve 5 mm, implant uzunlukları da 5 mm, 6 mm, 7 mm olarak tasarlanmıştır. Insan çene kemiği Bilgisayarlı tomografi görüntülerinden transfer edilmiştir. Her bir implant modeli çene kemiğine implante edilerek Sonlu Elemanlar Analiz yöntemiyle analiz edilmiştir. İmplant sayısının stabilite üzerindeki etkisini görmek amacıyla, tamamen dişsiz çeneye 4 adet implant yerleştirilerek analiz gerçekleştirilmiştir.