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    The effect of Nd:YAG laser irradiation on root surface: shear-bond strength and SEM-EDX study
    (Taylor & Francis Ltd, 2015) Akman, Melek; Celik, Kezban; Ozcopur, Betul; Terlemez, Arslan
    To investigate the effects of Nd:YAG laser and 17% EDTA treatment on root-dentin mineral content using scanning electron microscope-energy dispersive X-ray spectroscopy (SEM-EDX) and on shear-bond strength of epoxy-resin-based sealer (AH Plus) to root dentin. Twelve extracted premolars were decoronated and roots were sectioned, so that 24 two-root halves were obtained. Element levels of each half were examined by SEM/EDX, and AH Plus build-ups were created. After shear-testing, the test surfaces were reground and subjected to a 5.25% NaOCl. Two subgroups were created according to the surface treatment (n=12): G1, with 17% EDTA for 5min; G2, with the Nd:YAG laser. The element level analysis and shear-bond strength test were repeated for each half; the data were recorded (MPa) and analyzed (paired samples t-test). The EDTA treatment increased the O, C, Ca/P ratio (p<0.001), decreased Ca, P content (p=0.000), but did not change Na, Mg content (p>0.05). The Nd:YAG laser increased O, Ca/P ratio (p<0.001), and decreased the Ca, P content (p=0.000). The C, Mg, Na content did not change with the Nd:YAG laser (p>0.05). Both 17% EDTA and Nd:YAG laser had an effect on the mineral content of roots. The 17% EDTA treatment decreased the shear-bond strength of AH Plus to root dentin (p=0.000); however, the Nd:YAG laser did not affect the bond strength (p=0.238). Thus, an Nd:YAG laser can be used for disinfection of the root canal when AH Plus is used as a sealer.
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    Which is effective on bond strength of resin-based sealers: incorporation of powdered dentin to primer or adhesive?
    (Taylor & Francis Ltd, 2015) Akman, Melek; Belli, Sema; Ozcopur, Betul; Eskitascioglu, Guercan
    The aim of this study was to investigate the effect of adding powdered dentin to primer or adhesive in a self-etch system on the shear bond strength of three resin-based sealers. Seventy-two premolars were sectioned buccolingually, and 144 root halves were divided into three groups according to the sealer used: epoxy resin-based sealer (AH Plus), methacrylate resin-based (RealSeal, Hybrid Root SEAL) n=48. The surfaces were irrigated with 5% NaOCl, 17% EDTA, distilled water for 5min. Four subgroups were created (n=12): control group; Clearfil Liner Bond 2V treated group; powdered dentin added to the primer of Clearfil Liner Bond 2V (40 wt.%); and powdered dentin added to the adhesive of Clearfil Liner Bond 2V (20 wt.%). Dentin powder was prepared. Three mm high buildups with a constant surface area of 3.45mm(2) were created using the sealers and allowed to set (37oC, 100% humid, 72h). The samples were tested to failure for shear bond strength (1mm/min). The data were calculated (MPa) and analyzed using two-way ANOVA, one-way ANOVA, and Tukey HSD tests. Adhesive use decreased the bonding performance of AH Plus (p=0.00). Mean bond strength of the other sealers was found similar to control. Primer or adhesive resin with powdered dentin did not increase the adhesive performance of the self-etch system used. The shear bond strength of RealSeal was significantly increased when powdered dentin was added to primer or adhesive (p=0.00). The effect of adding powdered-dentine to primer or adhesive in a self-etch system on the shear bond strength was sealer-dependent .