Person: DÖNMEZ, NAZMİYE
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Publication Metadata only Evaluation of Demographic Features and Oral Hygiene Habits in the Patients Referred to Oral and Maxillofacial Surgery Clinic(2014-11-08) DEMİRTAŞ, NİHAT; BAYER, SUZAN; DÖNMEZ, NAZMİYE; BAYER, SUZAN; DÖNMEZ, NAZMİYEPublication Metadata only The effect of Calcium Phosphate- containing Desensitizing agent on the Microleakage of multimode adhesive agent.(2015-04-26T00:00:00Z) HERGÜNER SİSO, ŞEYDA; DÖNMEZ, NAZMİYE; Kabadayı, Büşra; DÖNMEZ, NAZMİYEPublication Metadata only Evaluating Cytotoxic Effects and Cytotoxicity Origins of Bulk-Fill Materials by LC-MS/MS.-(2022-09-17T00:00:00Z) Kazak, Mağrur; Dönmez, Nazmiye; Bahadori, Fatemeh; Yenigün, Vildan Betül; Koçyiğit, Abdürrahim; DÖNMEZ, NAZMİYE; YENİGÜN, VILDAN BETÜL; KOÇYİĞİT, ABDÜRRAHİMPublication Metadata only İki Farklı Hassasiyet Giderici Ajanın ve ErCrYSGG Lazerin Dentin Tübülleri Üzerindeki Etkisi: in vitro Çalışma (SEM ve AFM).(2019-12-08T00:00:00Z) ŞEŞEN USLU, YEŞİM; DÖNMEZ, NAZMİYE; TOZ AKALIN, TUĞBA; ULUKAPI, HAŞMET; DÖNMEZ, NAZMİYEPublication Open Access Effect of polymerization time and home bleaching agent on the microhardness and surface roughness of bulk-fill composites: A scanning electron microscopy study(2019-01-01T00:00:00Z) ÖZDUMAN, ZÜMRÜT CEREN; Kazak, Magrur; FİLDİŞİ, MEHMET ALİ; ÖZLEN, RÜMEYSA HATİCE; DALKILIÇ, Evrim; DÖNMEZ, NAZMİYE; ÖZDUMAN, ZÜMRÜT CEREN; FİLDİŞİ, MEHMET ALİ; ÖZLEN, RÜMEYSA HATİCE; DALKILIÇ, EVRIM; DÖNMEZ, NAZMİYEObjective: The aim of this study is to evaluate the microhardness and surface roughness of two different bulk-fill composites polymerized with light-curing unit (LCU) with different polymerization times before and after the application of a home bleaching agent. Materials-methods: For both microhardness and surface roughness tests, 6 groups were prepared with bulk-fill materials (SonicFill, Filtek Bulk Fill) according to different polymerization times (10, 20, and 30 s). 102 specimens were prepared using Teflon molds (4 mm depth and 5 mm diameter) and polymerized with LCU. 30 specimens (n = 5) were assessed for microhardness. Before home bleaching agent application, the bottom/top (B/T) microhardness ratio was evaluated. After bleaching agent application, the microhardness measurements were performed on top surfaces. Roughness measurements were performed in 72 specimens (n = 12) before and after bleaching application. Additionally, for SEM analyses, two specimens from all tested groups were prepared before and after bleaching agent application. The data B/T microhardness ratio before bleaching was analyzed by two-way ANOVA and Tukey's HSD test. The data from the top surface of specimens' microhardness before and after bleaching were analyzed using Wilcoxon signed-rank test, Kruskal-Wallis, Mann-Whitney U tests. The data from surface roughness tests were statistically analyzed by multivariate analysis of variance and Bonferroni test (p < 0.05). Results: The B/T microhardness ratio results revealed no significant differences between groups (p > 0.05). Comparing the microhardness values of the composites' top surfaces before and after bleaching, a significant decrease was observed exclusively in FB30s (p < 0.05). No significant differences in surface roughness values were observed when the groups were compared based on bulk-fill materials (p > 0.05) while the polymerization time affected the surface roughness of the SF20s and SF30s groups (p < 0.05). After bleaching, surface roughness values were significantly increased in the SF20s and SF30s groups (p < 0.05). Conclusion: The clinicians should adhere to the polymerization time recommended by the manufacturer to ensure the durability of the composite material in the oral environment.Publication Metadata only Microleakage of Hydrophilic Sealant After Different Enamel Etching Tecniques(2014-06-08) GÜÇLÜ, ZEYNEP ASLI; DÖNMEZ, NAZMİYE; TÜZÜNER, TAMER; ODABAŞ, MESUT ENES; DÖNMEZ, NAZMİYEPublication Open Access Impact of a Surface Sealant Application on the Color Stability of a Nano-hybrid Composite Resin(2021-12-01T00:00:00Z) Sarıalioğlu Güngör, Ayça; Dönmez, Nazmiye; Kahya, Deniz Selin; Hergüner Siso, Şeyda; SARIALİOĞLU GÜNGÖR, AYÇA; DÖNMEZ, NAZMİYEObjective: Mouthwashes containing chlorhexidine can cause discoloration in restorative materials when used for the long-term. To prevent staining of a restorative material, several protective materials are used. The aim of this in vitro study was to evaluate the impact of a surface sealant on the color stability of a nano-hybrid composite resin material immersed in different mouthwashes. Methods: A total of 42 composite resin discs (10x2 mm) were prepared with a nano-hybrid composite resin (Herculite XRV Ultra) using Teflon moulds. The composite specimens were first divided into two groups (with or without a surface sealant) then into three subgroups (n=7) according to the mouthwashes (Gengigel, Oderol, and Chlorhex). After SS application to 21 specimens, all the discs were subjected to baseline color measurements using a spectrophotometer according to the Commission Internationale de l’Eclairage L*a*b* system. The specimens underwent thermal cycling. Following immersion in different mouthwashes for 24 hours, the color measurements were repeated. The ∆E data were assessed using Kruskal-Wallis one-way ANOVA. Mann-Whitney U test was performed for different immersion mouthwashes (p<0.5). Results: Statistically significant differences (p<0.5) were found between the unsealed composite specimens immersed in Chlorhex and the other mouthwashes in terms of ∆E values. The Chlorhex appeared to be associated with the most severe alteration in color (5.14±0.83), followed by Gengigel (2.21±1.46) and Oderol (1.94±1.75). There were no statistically significant differences (p>0.05) between the sealed and unsealed composite specimens in terms of the color changes. Conclusion: The application of a low viscosity liquid surface sealant material did not show the expected effect on the color stability of a nano-hybrid composite resin in terms of three different mouthwashes.Publication Metadata only The effect of different Er-YAG laser pulse modes on the composition of dentin(2015-10-17T00:00:00Z) SARI, TUĞRUL; ÜŞÜMEZ, ASLIHAN; DÖNMEZ, NAZMİYE; DÖNMEZ, NAZMİYEPublication Open Access Perceptions of dental students towards online education during the COVID-19 pandemic(2021-12-01T00:00:00Z) Sarıalioğlu Güngör, Ayça; Şeşen Uslu, Yeşim; SARIALİOĞLU GÜNGÖR, AYÇA; DÖNMEZ, NAZMİYEPurpose: This study evaluated the usage habits, attitudes, and perceptions of undergraduate dental students toward distance (online) learning and identified variables related to those attitudes. Materials and methods: The study included 1,605 undergraduate dental students who participated voluntarily. The data collection tool consisted of a distance learning attitude scale, a questionnaire on personal information, and open-ended questions. The perceptions of dental students to distance education according to the year and type of dental school they attended were evaluated. Results: Most students expressed that distance learning in dental courses was not as effective as traditional face-to-face education (59.1%, n=949). While students studying at state universities had a more negative view of distance education, the satisfaction scores of the first-year students were found to be significantly lower than the other students (p<0.05). Conclusion: Dental students were generally unhappy with the interruption of traditional education caused by COVID-19 and having to continue their education online. However, under the circumstances, they saw it as an advantage allowing them to continue their education and avoid a complete suspension.Publication Metadata only Effect of thermal cycling on micro-tensile bond strength of composite restorations bonded with multimode adhesive(2015-04-18) Donmez, NAZMİYE; Siso, Seyda Herguner; ÜŞÜMEZ, Aslihan; Bayrak, Isil; DÖNMEZ, NAZMİYEObjective: The purpose of this in vitro study was to evaluate the effect of thermal cycling on the micro-tensile bond strength (Mtbs) of multimode adhesive agents. Materials and methods: Eight freshly extracted caries-free human third molars were used. The flat dentin surfaces were prepared and polished with 600-grit SiC abrasive paper for standard smear layer formation. The teeth were restored using Single Bond Universal Adhesive [(total etch (G1, G2)/self etch (G3, G4)] + Filtek Z550 and All-Bond Universal Adhesive [(total etch (G5, G6)/self etch (G7, G8)] + Aelite all-purpose. The specimens in groups G1, G3, G5, and G7 were subjected to thermal cycling (1000 cycles at 5-55 degrees C, for a 30 s dwell time), while the specimens in other groups were not exposed to an aging procedure. The Mtbs test was determined in all procedures. Data were submitted to three-way ANOVA and post hoc tests. The significance level was set at = 0.05. Results: Group five was highly affected by the thermal cycling following the total etch procedure, while group one was not significantly affected. Group seven was highly affected by thermal cycling, while group three was not significantly affected after the self etch procedure. Group eight exhibited a higher mean Mtbs value after the thermal cycling procedure. Conclusion: The bond strength of multimode (universal) adhesives was found to be material dependent. The total etch procedure showed a higher Mtbs value than the self etch procedure.