Person: ÖZYILMAZ, ÖZGÜN YUSUF
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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 Open Access Effect of mucosa thicknesses on stress distribution of implant-supported overdentures under unilateral loading: Photoelastic analysis(2019-10-01T00:00:00Z) ÖZYILMAZ, ÖZGÜN YUSUF; AYKENT, FİLİZ; Ozel, Gulsum Sayin; ÖZYILMAZ, ÖZGÜN YUSUFIntroduction: The aim of this study was to evaluate the effect of different heights of attachment and mucosa thicknesses on the stress distribution of two implant-retained mandibular overdenture designs under loading using the photoelastic stress analysis method. Materials and methods: Six photoelastic models of an edentulous mandibula were fabricated with two solitary implants that were placed in the canine regions. The attachment systems studied were ball and locator stud attachments. Both the ball and locator groups included three models that had different residual ridge heights so as to provide different mucosa thicknesses (1 mm-1 mm, 1 mm-2 mm, 1 mm-4 mm). A static vertical force of 135 N was applied unilaterally (each on the right then the left side) to the central fossa of the first molars. Models were positioned in the field of a circular polariscope to observe the distribution of isochromatic fringes around the implants and the interimplant areas under loading. The photoelastic stress fringes were monitored and recorded photographically. Results: The ball attachment groups showed higher stress values than did the locator groups under loading. Both attachment systems produced the lowest stress values in stimulated 1 mm-1 mm mucosa thickness models. The models with 1 mm-2 mm mucosa thicknesses showed higher stress values than did other models for both attachment systems. The highest stress value observed around both attachment systems was the moderate level in all test models. Conclusion: In different height mucosa thicknesses, locator attachment models distributed the load to the other side of the implant and its surrounding tissue, whereas the ball attachment did not. Regardless of mucosal thickness and attachment type, the implant on the loading side was subjected to the highest stress concentration.Publication Open Access Evaluation of Patients- Awareness Levels Regarding Implant And Implant-Supported Prosthesis Who were Admitted to Bezmialem Vakif University Faculty of Dentistry(2022-01-01T00:00:00Z) Davut, Umur; ÖZYILMAZ, ÖZGÜN YUSUF; ÖZYILMAZ, ÖZGÜN YUSUFObjective: The aim of this study was to investigate the knowledge level of the totally or partially edentulous patients who were admitted to the Dentistry Faculty of Bezmialem Vakif University and to investigate the factors affecting their ideas when choosing this treatment. Methods: To measure the knowledge level of the patients who were admitted to Faculty of Dentistry and to determine the factors affecting the decision-making processes, a survey was planned. A total of 250 participants were included in the survey. Results: While 57.3% of the participants knew that implant treatment was an alternative treatment, 13.3% of them stated that they had no idea, 29.3% had no opinion at all. When we asked the level of knowledge of the patients about the implant, 16% found it to be quite inadequate and 22% found it very adequate. Of the patients 40.6% stated that they acquired the information from the physician, when they were asked where the information about the implant was obtained. The other sources were friends and family in 24.6%, social media in 16%, internet in 14%, and other sources in 4.6%. While 49.3% of patients preferred implant treatment, they chose the option of being expensive as the biggest factor causing them to think negatively. Conclusion: As a result of the questionnaire, it was concluded that the knowledge level of the patients about implant treatment and the physician were insufficient in the transfer of this information. Further studies should be increased in order to raise awareness among patients.