Person: ÖZYILMAZ, ÖZGÜN YUSUF
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Publication Metadata 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, ÖZLEMThe 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.Publication Open Access Effect of cleansers on denture base resins- structural properties(2019-02-01) Ozyilmaz, Ozgun Yusuf; Akin, Ceyda; ÖZYILMAZ, ÖZGÜN YUSUFIntroduction: We assessed the effect of different available denture cleansers on the roughness and hardness of polyetherketoneketone, thermoinjection-molded polyamide, and polymethylmethacrylate. Materials and Methods: A total of 150 disc-shaped specimens were fabricated (10 mm × 2 mm) from these three denture base resins, and divided into five subgroups (n = 10) according to immersion procedures. One of these groups subjected to distilled water served as control, whereas other groups were subjected to daily cleansing with four denture cleansers (Corega, Protefix, Curaprox, and Perlodent) for 8 h a day for 140 days. The surface roughness and hardness values of specimens were recorded by measuring twice at baseline, and again after application of chemical solutions. Topography alterations after treatments were assessed with scanning electron microscopy. The data were subjected to statistical analysis and comparison among groups was done using Kruskal Wallis and Wilcoxon Signed Ranks tests. P-value <0.05 was considered significant. Results: The surface roughness of polyetherketoneketone, polymethylmethacrylate, and polyamide dentures was increased significantly by chemical solutions of denture cleansers. While the hardness value of polyetherketoneketone was not affected significantly after immersion in denture cleansers, those of polymethylmethacrylate and polyamide decreased significantly. Compared with Curaprox, the effervescent tablets significantly altered the surface hardness and roughness of polyamide. Conclusion: Denture cleansers can considerably alter the surface roughness and hardness of denture base resins and should be used carefully depending on the material.Publication Metadata only Effect of two activated bleaching techniques on surface roughness of different esthetic restorative materials(2017-01-01T00:00:00Z) ALPTEKİN, Tuncay; Özyilmaz, ÖZGÜN YUSUF; Aykent, Filiz; Kara, Haluk Bariş; ÖZYILMAZ, ÖZGÜN YUSUFPublication Metadata only Termal ve mekanik yükleme siklusunun self–etch rezin yapıştırma simanının dentine bağlanma dayanımı üzerine etkisi(2017-07-01) KARA, ÖZLEM; SARI, TUĞRUL; ÖZYILMAZ, ÖZGÜN YUSUF; İNAN KURUGÖL, PELİN; KARA, HALUK BARIŞ; KARA, ÖZLEM; ÖZYILMAZ, ÖZGÜN YUSUFPublication Metadata only Temperature rises during tooth bleaching with different light-curing units(2015-08-03T00:00:00Z) Ozyilmaz, Ozgun Yusuf; Yavuz, Tevfik; SARI, Tugrul; Aykent, Filiz; Ozturk, Atiye Nilgun; ÖZYILMAZ, ÖZGÜN YUSUFThe aim of this study was to evaluate the influence of three different light-curing units on the temperature rise induced in the pulpal cavity, when bleached with 35% hydrogen peroxide (HP). Forty extracted maxillary central incisors were randomly divided into four groups according to photoactivation procedure (n=10). Whiteness HP (WHP) bleaching agent which contains 35% HP bleach was placed on the facial tooth surface and no photoactivation device was used (control); an blue light-emitting diode (LED, 40s), a diode laser (4W, Continous mode, 20s), and Nd:YAG laser (4W, 60Hz frequency, 20s). Temperature rise in the pulpal chamber was measured with a J-type thermocouple wire that was connected to a data logger before and immediately after each 20-40s application. One tooth of each group was selected for scanning electron microscope analysis. Data were analyzed using one-way ANOVA followed by the Games Howell post hoc test at a preset alpha of 0.05. One-way ANOVA revealed that there was a significant difference among the light-curing units (p<0.05) and between control group and light-curing units (p<0.05). The Nd:YAG induced significantly, which resulted in higher temperature increase than other light-curing units (10.7 degrees C). The LED unit produced the lowest temperature changes (3.2 degrees C) among the light-curing units. The presence of the bleaching gel did not cause a temperature increase in control group (0 degrees C). The results suggested that using light-curing units caused temperature changes in the intrapulpal cavity during tooth bleaching. The use of LED will be more safer for pulpal health when assisted with WHP bleaching gel.Publication Metadata only Temperature Rises During Tooth Bleaching with Different Light Curing Units(2012-05-03T00:00:00Z) Özyılmaz, Özgün Yusuf; Yavuz, Tevfik; Sarı, Tuğrul; Aykent, Filiz; Öztürk, Atiye Nilgün; ÖZYILMAZ, ÖZGÜN YUSUFPublication Metadata only Evaluation of the shear bond strength of resin cement to enamel after bleaching with Er: YAG and diode laser(2020-05-05T00:00:00Z) Ceyda, Akin; Mujde, Sevimay; Neslihan, Cokuk; ÖZYILMAZ, ÖZGÜN YUSUFObjective:Publication Metadata only Bond strength of resin composite to light activated bleached enamel(2016-11-01T00:00:00Z) Yavuz, T.; Ozyilmaz, O. Y.; Ozturk, A. N.; Aykent, F.; ÖZYILMAZ, ÖZGÜN YUSUFObjectives: This study evaluated the microtensile bond strength (mu TBS) of a resin composite bonded to bleached enamel as a function of bleaching conditions.Publication Metadata only Effects of repeating bleaching procedure on color stability various porcelains(2019-09-08T00:00:00Z) SAYIN ÖZEL, GÜLSÜM; TAHA, MUHAMMED ESAD; ÖZYILMAZ, ÖZGÜN YUSUF; ERDEM, KÜBRA; ERDEM, KÜBRA; ÖZYILMAZ, ÖZGÜN YUSUFPublication Metadata only Prosthetic rehabilitation of edentulous patients by using the -Toronto hybrid prosthesis-:3 case reports(2021-11-06T00:00:00Z) Çalık, Kıymet; Dolanmaz, Doğan; Özyılmaz, Özgün Yusuf; ÇALIK, KIYMET; DOLANMAZ, DOĞAN; ÖZYILMAZ, ÖZGÜN YUSUF