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  • Öge
    Shear bond strength of composite resin cements to ceramics
    ( 2013) Özyöney Gürol ; Yanıkoğlu, Funda ; Tağtekin, Dilek ; Özyöney Nuran ; Öksüz, Mustafa ; TR9686 ; TR172026
    The study aimed to evaluate the comparison of the shear bond strength of IPS Empress II and recent IPS e.max ceramics luted with eight different luting resins tested with three adhesion types: total etch, self-etch or self-adhesion. Two cylindrical shaped (7.2 mm×4.1 mm) ceramic specimens (IPS Empress II® , IPS e.max® ) were used for each test group yielding a total number of 160 specimens. The specimens in each group which were randomly divided into 8 groups (n:10) were luted with eigth different resin composite luting cements (Variolink with Heliobond adhesive system, Bifix QM with Solobond Plus adhesive system, Choice with One Step Plus adhesive system, Multilink with Primer A+B adhesive system, Bifix QM with Futurabond DC adhesive system, experimental self adhesive luting resin, G-cem self adhesive luting resin, BisCem self adhesive luting resin). In all specimens, HF (5%) and silane were applied. All specimens were stored in water for 24 h and then subjected to 10000 cycles of thermocycling (5 Cº and 55 Cº). Bond strength was measured by means of a shear test, using Zwick Z010® universal testing machine with 0.5 mm/min speed until failure. To determine the statistical significance of the differences between the mean shear bond strength values, KruskalWallis, Dunn’s multiple comparisons test and Mann-Whitney U tests were used. Shear bond strength of luting resins using totaletch system showed better mean values than the resin cements using self etch and self adhesive systems (total etch 22.40 ±9.95; self-etch 16.76±7.78; self-adhesive 8.05±3.04 for IPS Empress II) (total etch 20.44±5.48; self-etch 17.59±5.18; self-adhesive 8.41±3.27 for IPS e.max). The shear bond strength values of self adhesive system were significantly lower (P<0.05) than the other systems. No significant differences were observed between IPS Empress and IPS e.max ceramics according to shear bond strength. Adhesive failure was the most prevalent type of failure for both IPS Empress® and IPS e.max® . IPS Empress II® ceramics gave promising results, using with totaletch adhesive systems under the conditions of this in vitro study. Keywords: IPS Empress II® , IPS e.max® , shear bond strength, luting resin, total ecth, self etch, self adhesive.
  • Öge
    The effect of surface treatments on the bond strength of fiber post to root canal dentin
    (Marmara Dental Journal, 2013) Gençoğlu, Nimet ; Sezgin, Pelin ; Gündoğar, Mustafa ; Şivet, Can ; TR37358 ; TR186818 ; ;
    It’s known that many factors such as root canal dentin or post surface treatment may effect the retention of post. The purpose of this in vitro study was to evaluate the effect of different surface treatments on the bond strength of fiber post with luting agent to root canal dentin. 75 extracted single root teeth were used in this study. The canals were prepared with rotary instruments and obturated by AH Plus and lateral condensation technique. After post space preparation, 75 fiber-posts (Rebilda, Voco) were divided into 5 groups and treated with one of the following surface treatment procedures: no treatment (control), silanization, etching by % 9.6 hydrofluoric acid, sand blasting with 50 milimicron Al2O3 and bonded (15 of each). After that, posts were bonded with dual polimerizing resin based luting material. The specimens were embedded in acrilic resin blocks and sliced from the apical, middle, coronal part of the roots. A push out bond strength test was performed by a universal testing machine at across head speed of 1mm/min. Data were analyzed with one-way Anova and Tukey tests. Although silanization showed the least and sanding the best bond strength, only statistical difference was found between silanization and etching (p<0.05) and between sanding and bonding (p<0.05). Bonding group showed the highest bond strength in coronal section, and sandblasted group in middle and apical section (p<0.05). The different surface treatment affected the bond strenght of fiber post to root canal dentin.
  • Öge
    Capability of an ultrasonic system to detect very early caries lesions on human enamel
    (Marmara Dental Journal, 2013) Bozkurt, Funda Öztürk ; Tağtekin, Dilek ; Yanıkoğlu, Funda ; Fontana, Margherita ; Gonzalez-Cabezas, Carlos ; Stookey, George K. ; TR142148 ; TR172026 ; TR9686
    The purpose of this investigation was to determine if changes in dental enamel with 20 micron depth incipient carious lesion could be detected by an ultrasonic system (US). Natural (unground, unpolished) lesions were produced on human enamel by using a microbial caries model. Specimens with lesions were analyzed using Ultrasonic system (US) as test method, Quantitative-Light Induced Fluorescence (QLF) and Confocal Laser Scanning Microscopy (CLSM) as gold standards. It was found that both ultrasound and QLF could not detect these very early lesions (mean lesion depth: 18.89 μm) created in vitro in the microbial caries model.