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GÜVEN, MEHMET EJDER

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MEHMET EJDER
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GÜVEN
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    Bond strength of glass carbomer material to enamel and dentin following different surface pretreatments
    (2017-01-01T00:00:00Z) Ayar, Muhammet Kerim; GÜVEN, Mehmet Ejder; GÜVEN, MEHMET EJDER
    Objective: Enamel and dentin bond strengths of restorative glass carbomer material were determined by shear bond strength (SBS) test after different surface treatments in this study.Materials and methods: Flat enamel and dentin surfaces pre-treated with 37% phosphoric acid (15s for enamel and dentin), or 20% polyacrylic acid (15s for enamel and dentin). Glass carbomer applied to the treated and non-treated surfaces. Conventional glass ionomer without any surface treatment served as a control.Results: Enamel and dentin SBSs of the conventional glass ionomer cement were significantly higher than those of the glass carbomer material bonded to enamel and dentin without any surface treatments. Acid-etching and polyacrylic acid pre-treatments yielded similar enamel bond strength to that of glass ionomer cement. For dentin bonding, only polyacrylic acid pre-treatment improved SBS of glass carbomer to dentin surface.Conclusions: Clinicians may consider the use of polyacrylic acid conditioner prior to the use of glass carbomer material.
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    The metameric effect of monolithic zirconias with varying yttrium ratios
    (2024-01-01) Güven M. E.; KARA Ö.; GÜVEN, MEHMET EJDER; KARA, ÖZLEM
    PURPOSE. To evaluate the metameric disparities among monolithic zirconia materials with differing yttrium compositions across various lighting conditions. MATERIALS AND METHODS. Thirty-six square-shaped zirconia samples measuring 10 X 10 X 0.5 mm were prepared from monolithic zirconia materials with three different yttrium contents. A 0.2 mm thick layer of polymerized dual-polymerizable self-adhesive resin cement was created using a silicone mold with the same dimensions as the prepared zirconia specimens. To evaluate metamerism, color measurements were conducted using a spectrophotometer device on a neutral gray background in a color measurement cabinet that offers four different illumination environments. All samples underwent aging by subjecting them to 10000 thermal cycles using a thermal cycle tester. Following thermal aging, color measurements were taken once more, and the data were recorded using the CIE L*, a*, b* color system. Two-way ANOVA and Post-hoc Bonferroni tests were employed to analyze the data. RESULTS. It was observed that there was no statistical difference among the color measurements made in different illumination environments of the monolithic zirconia ceramics used to evaluate metamerism P(>. 05). This observation remained consistent both before and after thermal aging. After thermal aging, the color of monolithic zirconia materials exhibited a tendency towards red and yellow hues, accompanied by a decrease in brightness levels. CONCLUSION. It can be stated that different illumination conditions did not affect the metamerism of monolithic zirconia materials, but there was a color change in monolithic zirconia materials after a thermal aging period equivalent to one year. [J Adv Prosthodont 2024;16:48-56]