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  • Küçük Resim
    Öğe
    Effect of different surface treatments on porcelain-resin bond strength
    (Wiley, 2017) Yavuz, Tevfik; Özyılmaz, Özgün Yusuf; Dilber, Erhan; Tobi, Elif Sümeyye; Kılıç, Hamdi Şükür
    Purpose:The aim of this study was to evaluate the effects of various surface treatments on the surface structure and shear bond strength (SBS) of different ceramics. Materials and Methods: total of 192 disk-shaped cores were prepared using two all-ceramic systems, of which 168 were submitted to SBS tests, and 24 were investigated by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The ceramics used were IPS Empress e.max (EX) lithium glass-ceramic and Vita In-Ceram Zirconia glass-infiltrated zirconia (ICZ). The specimens were randomly divided into seven groups (n = 12) on the basis of the surface treatment used: control; SB-sandblasting with 50 mu m Al2O3 particles; CJ-chairside silica coating with 30 mu m SiO2 particles and silanization (Clearfil Porcelain Bond Activator); HF-etching in 5% hydrofluoric acid and silanization; ER-etching with an Er:YAG laser (10 W); ND-Nd:YAG laser etching (0.8 W); and FS-etching with a femtosecond laser (860 mW). A luting cement (Clearfil Esthetic) was photopolymerized on each treated ceramic disk. After subjecting the specimens to thermocycling (1000 cycles, 5 degrees C to 55 degrees C), SBS tests were performed using a universal testing machine. The data were analyzed with two-way ANOVA and Tukey's tests using a significance limit of 5%. Results: ong the EX ceramics, the CJ (29.10 MPa) and HF (26.07 MPa) specimens had statistically higher SBS values. For the ICZ ceramics, the highest value (28.08 MPa) was obtained for the CJ specimens. Conclusions: lanization after coating with silica improves the bond strengths of both EX and ICZ specimens, while HF etching is favorable only for the EX specimens.
  • Küçük Resim
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    Effects of different demineralization-inhibiting methods on the shear bond strength of glass-ceramics
    (Wiley, 2015) Dilber, Erhan; Akın, Mehmet; Yavuz, Tevfik; Erdem, Ali
    PurposeThis in vitro study was undertaken to evaluate the effects of different demineralization-inhibiting methods on the shear bond strength (SBS) of glass-ceramics. Materials and MethodsNinety extracted intact human mandibular lateral insicors were randomly divided into six equal groups. Group C was left untreated, while enamel subsurface demineralization was induced in the other groups. In group D, porcelain discs (3 mm in diameter) were cemented to demineralized enamel by using total-etch photopolymerizing luting composite resin without pretreatment. Demineralized specimens in groups F, CA, M, and I were pretreated with fluoride gel, CPP-ACP paste, microabrasion, and resin infiltration, respectively, and then porcelain discs were cemented. SBS (MPa) was calculated from the failure load (N) per bonded area (mm(2)). Fracture types were examined by optical microscopy (40x magnification). Data were analyzed with ANOVA, Tukey's test, and G-test. ResultsANOVA revealed significant intergroup differences (p < 0.01). No significant differences in SBS (MPa) were found between groups C (19.48 2.0) and I (20.02 +/- 1.6). Lower SBS values were recorded in groups D (7.93 +/- 0.8), F (12.51 +/- 1.5), CA (17.08 +/- 1.3), and M (14.84 +/- 1.4). Mixed and cohesive failures were the most prevalent in groups M and I, respectively. ConclusionResin infiltration enhanced the SBS of porcelain discs bonded to demineralized enamel when compared with the other demineralization-inhibiting methods. Clinical Relevance: Resin infiltration could be useful to enhance adhesion of glass-ceramics to teeth with white spot lesions.
  • Küçük Resim Yok
    Öğe
    THE EFFECTS OF DIFFERENT DENTIN HYPERSENSITIVITY TREATMENTS ON THE SHEAR BOND STRENGTH BETWEEN ADHESIVE COMPOSITE RESIN AND DENTIN
    (2014) Dilber, Erhan; Çevik, Pınar; Akpınar, Yusuf Ziya; Öztürk, A. Nilgün
    Amaç: Bu invitro çalışmanın amacı farklı duyarlılık tedavilerinin, adeziv akışkan kompozit rezinin dentine makaslama bağlanma dayanıklılığı üzerine etkilerini değerlendirmekti. Gereç ve Yöntem: Tüm dentin örnekleri, smear tabakasını uzaklaştırmak ve hassas dentin yüzeylerini taklit edecek şekilde dentin tübüllerini açmak için 0,5 EDTA ( pH 7.4) ile iki dakika pürüzlendirildi: Kırk örnek rastgele dört gruba ayrıldı (n=10) (1) Grup C (kontrol); (2) Grup N (Nd:YAG lazer tedavisi); (3) Grup G (Gluma Hassasiyet giderici tedavisi); (4) Grup N+G (Gluma hassasiyet giderici uygulamasının ardından Nd:YAG lazer tedavisi). Dentin yüzeyine akışkan kompozit rezin uygulandı ve makaslama bağlanma dayanıklılık testi uygulandı. Ortalama MBD değerleri değerlendirildi, kırılma tipleri belirlendi ve veriler tek-yönlü ANOVA ile analiz edilip Tukey HSD testi ile karşılaştırıldı. Bulgular: Grup G (11,7±4,6 MPa) ve Grup N (18,5±2,5 MPa) arasında anlamlı fark bulundu (p=0.05). Diğer gruplar arasında anlamlı fark gözlenmedi. SEM değerlendirmesi, Grup N’nin bazı bölgelerde, dentin tübüllerinin periferini modifiye ederek ve eriterek açık dentin tübüllerini tıkadığını gösterdi. Grup G’de etkilenen tübüllerin çapında azalma ve belirgin daralma gözlendi. Grup N+G, dentin tübüllerini değişen derecelerde tıkadı. Sonuç: Gluma hassasiyet giderici ardından Nd:YAG lazer uygulaması, dentin hassasiyeti için etkili bir tedavi olabilir ve adeziv kompozit rezinin dentin yüzeyine bağlanma dayanıklılığını olumsuz yönde etkilemez.