Browsing by Author "Yazici, A. Ruya"

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    Effect of An Er,Cr:YSGG Laser Preparation on Dentin Bond Strength of A Universal Adhesive
    (2016) Yazici, A. Ruya; Karaman, Emel; Tuncer, Duygu; Berk, Gizem; Ertan, Atilla
    The aim of this study was to evaluate the bond strength of a universal adhesive system to dentin prepared with SiC paper or an Er, Cr:YSGG laser using different bonding strategies (etch-and-rinse versus self-etch mode). Ninety-six extracted caries-free, sound human molars were used. The teeth were longitudinally sectioned in the mesiodistal direction and were wet polished with 600-grit SiC paper to obtain a standardized flat dentin surface. All prepared teeth were randomly divided into two groups, according to the surface preparation method: GroupI: an erbium, chromium: yttrium, scandium, gallium, garnet laser; Group II: silicon carbide paper[SiC] (n = 48). Each group was then assigned into three subgroups according to the universal adhesive's (Single Bond Universal) bonding strategies: (a) etch-and-rinse mode with phosphoric acid, (b) etch-and-rinse mode with a laser, (c) self-etch mode (n = 16). For surface preparation, the Er, Cr: YSGG laser was used at 3 W, 30 Hz with 140 mu s pulse duration for 25 s. For etching mode, the laser was used at 1.5 W (60% air, 70% water). Cylinders of composite were fabricated on the bonding area and shear bond strength was determined using a universal testing machine. Failure modes were evaluated using a stereomicroscope. The data were analyzed using two-way ANOVA followed by the Bonferroni test (p < 0.05). Bonding strategies showed statistically significant differences in both the SiC-and laser-prepared groups (p < 0.05). Universal adhesive used in etch-and-rinse mode with acid showed significantly higher bond strength values than in self-etch mode (p < 0.05). The bond strength values did not differ according to the surface preparation method (p > 0.05). Irrespective of preparation method, using universal adhesive in etch-and-rinse mode with acid might improve dentin bond strength. Laser preparation did not affect the bond strength of the universal adhesive tested.
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    In Vitro Comparison of An Er:YAG Laser-Activated Bleaching System with Different Light-Activated Bleaching Systems for Color Change, Surface Roughness, and Enamel Bond Strength
    (2018) Ergin, Esra; Yazici, A. Ruya; Kalender, Bercem; Usumez, Aslihan; Ertan, Atilla; Gorucu, Jale; Sari, Tugrul; 0000-0002-8637-5393; 29860663; Z-4568-2019; AAH-8770-2019
    To compare an Er:YAG laser-activated bleaching system with different light-activated in-office bleaching systems for color change, surface roughness, and post-bleaching enamel bond strength. 51 enamel slabs were prepared from the sound buccal enamel of extracted bovine teeth. The teeth were randomly divided into three groups according to different light-activated office bleaching systems (n=17): diode laser (Epic, Biolase) (940nm, 7W, continuous mode), Er:YAG laser (LightWalker, Fotona) (2940nm, 50mJ, 10Hz, 1000s), and LED (Radii Plus) (440-480nm, 1500mW/cm(2)). All systems were used with their compatible bleaching agents according to manufacturers' recommendations. The tooth color and surface roughness (Ra) were assessed at baseline and after bleaching using a spectrophotometer and a surface profilometer, respectively. The color change was determined by the CIE L*a*b* system (E, L*, a*, b*). Kruskal-Wallis test was used for color change whereas Kruskal-Wallis and Wilcoxon tests were used to analyze the roughness data. For shear bond strength test (SBS), composite cylinders were bonded on bleached enamel samples 14days after bleaching procedures and stored in water (37 degrees C). Specimens were then debonded with a universal testing machine at 1mm/min and data were analyzed by using Kruskal-Wallis test. All the tested bleaching systems were effective on color change (E>3.3) and produced similar color change (p>0.05). There were no significant differences among the Ra values of the groups neither at baseline nor after bleaching (p>0.05). However, comparing the baseline and after bleaching Ra values, a significant increase was observed for all tested groups (p<0.05). Significant differences were also found among all systems for SBS (p<0.05). The highest values were obtained in Er:YAG group, whereas the LED group revealed the lowest values (p<0.05). All tested bleaching systems were effective on tooth whitening, whereas they all led to an increase on surface roughness. Although the current Er:YAG laser-activated bleaching system did not differ from other tested bleaching systems according to color change and surface roughness, it appears to provide better results in terms of SBS.