Person:
KARA, ÖZLEM

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ÖZLEM
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KARA
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Now showing 1 - 4 of 4
  • PublicationMetadata only
    Evaluation of various denture cleansers on color stability and surface topography of polyetherketoneketone, polyamide, and polymethylmethacrylate
    (2020-08-01T00:00:00Z) ÖZYILMAZ, ÖZGÜN YUSUF; AKIN, CEYDA; KARA, ÖZLEM; ÖZYILMAZ, ÖZGÜN YUSUF; KARA, ÖZLEM
    The aim of this study was to evaluate the effect of sodium perborate effervescent tablets and citric acid solution on the color stability and surface topography of a new generation of high-performance polymer polyetherketoneketone (PEKK), thermoinjection-molded polyamide, and polymethylmethacrylate (PMMA). Fifty disc-shaped specimens were fabricated (10 mm x 2 mm) from PEKK (P group), polyamide (D group), and PMMA (M group). These groups were divided into five subgroups (n= 10) according to the storage media. The test groups were immersed in the following solutions: distilled water (Control), Corega, Protefix, Perlodent, and Curaprox. The color stability values (Delta E) were measured using a spectrophotometer before and after immersion in distilled water and four different denture cleansers for 8 hr/day for 140 days. Topography alterations after treatments were assessed with scanning electron microscopy (SEM). Data were analyzed by one-way analysis of variance (ANOVA) followed by Tukey-s Honest Significant Difference test. Thep < .05 was considered significant. All denture cleansers increased the Delta Evalues relative to the baseline values in the M, D, and P groups (p < .05). The Perlodent denture cleanser demonstrated the highest Delta Evalue in all groups, which was unacceptable. Curaprox denture cleanser showed the lowest Delta Evalue in the M and D groups (p < .05). Curaprox in all groups showed a increment Evalue less than 3.7. For patients who have PEKK- and polyamide-based prosthesis, the use of citric acid-based cleansers may be more recommended than sodium perborate-containing cleansers because of its clinically acceptable color changes on polymers in terms of color stability.
  • PublicationMetadata only
    Effect of artificial aging on the translucency of monolithic zirconia materials sintered at different temperatures
    (2022-01-01T00:00:00Z) Kanpalta, Burcu; Burduroğlu, Defne; Kara, Özlem; KARA, ÖZLEM
    © 2022 Editorial Council for The Journal of Prosthetic DentistryStatement of problem: Translucent zirconia materials were developed as an alternative to lithium disilicate materials. However, the effect of sintering temperature and artificial aging on the translucency of zirconia materials is unclear. Purpose: The purpose of this in vitro study was to investigate the translucency of recently developed zirconia materials after different sintering temperatures and the effect of artificial aging. Material and methods: Disk-shaped specimens (Ø15×1 mm) of 3 different monolithic zirconias (Katana UTML, Prettau Anterior, VITA YZ XT) and a control lithium disilicate reinforced glass ceramic (IPS e.max CAD LT) were evaluated. The zirconia specimens were divided into 2 subgroups with different sintering temperatures (1450 °C, 1550 °C) (n=5, N=35). The specimens were artificially aged in a thermocycle tester and a mastication simulator. The translucency parameter (TP) was calculated by measuring with a spectrophotometer. Kruskal-Wallis and Wilcoxon signed-rank tests were used to analyze the data (α=.05). Results: While the overall TP of monolithic zirconia increased after artificial aging, the lithium disilicate specimens did not show a statistically significant difference (P=.35). The Prettau Anterior and VITA YZ XT specimens had a statistically significant higher TP than Katana UTML (P=.009). Sintering temperature did not have a statistically significant effect on the TP value of monolithic zirconia materials (P>.05). Conclusions: Artificial aging increased the TP, and the sintering temperature did not affect the TP of monolithic zirconia. The use of fully stabilized zirconia may be an alternative to lithium disilicate in esthetic restorations in clinical practice.
  • PublicationMetadata only
    Rehabilitation of partial and total edentulism with Toronto Bridge Prostheses; 3 case reports.
    (2021-11-06T00:00:00Z) Sıncı, Aslı; Kara, Özlem; Dolanmaz, Doğan; Özyılmaz, Özgün Yusuf; SINCI, ASLI; KARA, ÖZLEM; DOLANMAZ, DOĞAN; ÖZYILMAZ, ÖZGÜN YUSUF
  • PublicationMetadata only
    Inhibition of cathepsin-K and matrix metalloproteinase by photodynamic therapy.
    (2021-09-06T00:00:00Z) Kara, ÖZLEM; Seseogullari Dirihan, Roda; Sayin Ozel, Gulsum; Tezvergil Mutluay, Arzu; Usumez, Aslihan; KARA, ÖZLEM