Person: TÜRKER, ŞEBNEM BEGÜM
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TÜRKER
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ŞEBNEM BEGÜM
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Publication Open Access Clinical gap changes after porcelain firing cycles of zirconia fixed dentures(KOREAN ACAD PROSTHODONTICS, 2014) TÜRKER, ŞEBNEM BEGÜM; Bugurman, Bugurman Burcu; Turker, Sebnem BegumPURPOSE. The aim of this study was to measure the changes on the marginal and internal adaptation of zirconia based anterior fixed partial dentures after the porcelain firing process. MATERIALS AND METHODS. A total of 34 anterior fixed partial dentures using LAVA CAD/CAM system (3M ESPE, Germany) were applied. Two silicone replicas were obtained: one is obtained before porcelain firing process (initial) and the other is obtained after porcelain firing process (final), followed by the examination under a binocular stereomicroscope. Kruskal Wallis and Wilcoxon Signed Ranks tests were used for the statistical analysis (P<.05). RESULTS. No statistically significant difference was found between initial and final marginal gap values (P>.05). At the internal gap measurements, final marginal area values (59.54 mu m) were significantly lower than the initial marginal area values (68.68 mu m)(P<.05). The highest and the lowest internal gap values were observed at the incisal/occlusal area and at the marginal area, respectively. In. addition, lower internal gap values were obtained for canines than for central incisors, lateral incisors and premolars at the incisal area (P<.05). CONCLUSION. The firing cycles did not affect the marginal gap of Lava CAD/CAM system, but it is controversial for the internal gap.Publication Metadata only Factors affecting the distribution and prevalence of oral mucosal lesions in complete denture wearers(WILEY, 2011) TÜRKER, ŞEBNEM BEGÜM; Mandali, Gamze; Sener, Isil Damla; Turker, Sebnem Begum; Ulgen, HasanObjective: To determine the frequency of the oral lesions related to gender, age, the length of time of denture usage, education level and economic status. Methods: The 153 patients with old complete dentures (CD) were asked to participate in the investigation. The subjects (76 male and 77 female) were 37-85 years of age with a mean age of 61.8 +/- 9.8 years. Education, economic status and age factors were estimated in subgroups. The data obtained were evaluated by one-way anova, Mann-Whitney U-test, Kruskal-Wallis test, Student's t-test and chi-squared test. The level of statistical significance was set at p < 0.05. Results: The patients who had denture stomatitis and traumatic ulcers were statistically significantly older than the ones who did not have these lesions (p < 0.05). Based on the length of denture usage, patients who had a flabby ridge, fibrous inflammatory hyperplasia, traumatic ulcers (p < 0.01) and denture stomatitis (p < 0.05) were using their dentures statistically significantly longer than the ones who had healthy tissues. Conclusions: The CD wearers should be advised to visit their dentist regularly to prevent oral mucosal lesions due to the changing supporting tissues during the length of denture usage and to improve their quality of life.Publication Metadata only Synthesis, Photopolymerization, and Adhesive Properties of Hydrolytically Stable Phosphonic Acid-Containing (Meth)acrylamides(WILEY-BLACKWELL, 2014) TÜRKER, ŞEBNEM BEGÜM; Altin, Ayse; Akgun, Burcin; Bilgici, Zeynep Sarayli; Turker, Sebnem Begum; Avci, DuyguThree novel dental monomers containing phosphonic acid groups (1a and 2a, based on diethyl amino(phenyl)methylphosphonate and 3a based on diethyl 1-aminoheptylphosphonate) were synthesized in two steps: the reaction of -aminophosphonates with acryloyl chloride (for monomers 1a and 3a) or methacryloyl chloride (for 2a) to give monomers with phosphonate groups, and the hydrolysis of phosphonate groups by using trimethyl silylbromide. Their (and the intermediates') structures were confirmed by FTIR, H-1, C-13, and P-31 NMR spectroscopy. All the monomers dissolve well in water (1Publication Metadata only Mental retarde hastada parafonksiyona bağlı olarak gelişen pseudoprognatik maloklüzyonun protetik rehabilitasyonu: Vaka raporu(2019-04-30) TÜRKER, ŞEBNEM BEGÜM; AKMANSOY, ŞÜKRÜ CAN; ŞANIVAR ABBASGHOLIZADEH, ZELİHA; ÖZKAN, YASEMİN; Atak B., Türker Ş. B., Akmansoy Ş. C., Şanıvar Abbasgholızadeh Z., Özkan Y.Amaç:Prognatik anomaliler hasta üzerinde ciddi sosyal ve fonksiyonel bozukluklar yaratır. Bu nedenle bu tür anomalilerin estetik ve fonksiyonel olarak rehabilitasyonu hastanın psikolojik ve dental tedavisi açısından gerekli olmaktadır. Bu vaka raporunda mental retarde hastada parafonksiyona bağlı olarak gelişmiş pseudoprognatik maloklüzyonun protetik rehabilitasyonu anlatılmıştır. Gereç ve Yöntem:Yirmi bir yaşında mental retarde erkek hasta Marmara Üniversitesi Diş Hekimliği Fakültesi Protetik Diş Tedavisi Anabilim Dalına yemek yiyememe şikayeti ile başvurmuştur. Ekstraoral muayenede hastanın sürekli dudaklarını emdiği ve alt çenesini önde konumlandırdığı görülmüştür. İntraoral muayenede 12 ve 21 numaralı dişlerin eksik olduğu 11 numaralı dişin palatal pozisyonda ve alt çenenin sınıf I kapanışını engellediği ve oklüzyonu sınıf III’e yönlendirdiği tespit edilmiştir. 13-22 nolu dişler arası sabit protetik restorasyon yapılmasına ve 11 numaralı dişin pozisyonunun değiştirilmesine karar verilmiştir. Tüm destek dişler chamfer bitim sınırı ile prepare edilmiş ve sınıf I kapanış sağlanmıştır. Hazırlanan metal destekli seramik restorasyonun oklüzal ilişkileri düzenlenmiş ve cam iyonomer siman (Ketac Cem 3M ESPE, ABD) ile simante edilmiştir. Bulgular: Diş erken teması sonucu meydana gelen pseudoprognatik vakada sabit protetik tedavi ile erken temas kaldırılmış ve hastada sınıf I oklüzyon sağlanmıştır. Hastanın 6 aylık klinik takibi sonucunda fonksiyonel, estetik ve fonasyonel bir şikayeti olmamıştır. Sonuç:Erken temas noktaları sebebiyle meydana gelmiş pseudoprognati vakalarında primer temas alanları ortadan kaldırılarak ideal oklüzyon tesis edilmesi özellikle engelli hastalarda estetik, fonksiyon ve fonasyonun sağlanması açısından kritiktir.Publication Metadata only Novel Bisphosphonated Methacrylates: Synthesis, Polymerizations, and Interactions with Hydroxyapatite(WILEY-V C H VERLAG GMBH, 2013) TÜRKER, ŞEBNEM BEGÜM; Bilgici, Zeynep Sarayli; Turker, Sebnem Begum; Avci, DuyguFive novel methacrylates containing either bisphosphonate (1 and 2), bisphosphonic acid (3), carboxylic acid (4), or both bisphosphonic andcarboxylic acid together (5), are synthesized. The monomers 1 and 2 are synthesized by the reactions of tetraethyl 1-hydroxyethane-1,1-diyldiphosphonate with ethyl -bromomethacrylate and tert-butyl -bromomethacrylate; the same procedure fails with tetraethyl hydroxy(phenyl)methylenediphosphonate. 1 is converted to 3 by hydrolysis with trimethylsilyl bromide (TMSBr), and 2 is converted to 4 by hydrolysis with trifluoroacetic acid (TFA). Monomer 5 is obtained by hydrolysis of 2 first with TMSBr and then with TFA. The hydrolytic stability, the properties of the copolymerizations with commercial dental monomers, and HAP interactions make these monomers promising candidates for dental adhesives. [GRAPHICS] .Publication Open Access Fracture resistance of endodontically treated canines restored with different sizes of fiber post and all-ceramic crowns(KOREAN ACAD PROSTHODONTICS, 2016) TÜRKER, ŞEBNEM BEGÜM; Turker, Sebnem Begum; Alkumru, Hasan Necdet; Akalin, BuketPURPOSE. The aim of this study was to determine the fracture resistance and the mode of fracture of endodontically treated teeth restored with different fiber posts and all-ceramic crowns. MATERIALS AND METHODS. Two glass fiber reinforced post systems in two different sizes and polyethylene fiber ribbon in two different thicknesses (n=10) were used. The specimens, restored with all-ceramic crowns, were subjected to a compressive load (in N) delivered at a 130-degree angle to the long axis until a fracture could be noted. The results were analyzed statistically with a One-Way ANOVA test (P<.05). RESULTS. Statistically significant differences were observed between the mean fracture resistance values of Postec, Snowlight, and Kerr Connect thin specimens (P<.0095). The Postec results (395.70 N) were found to be significantly higher than the others. No statistical difference was observed among the thick specimens (P<.2657). The mean fracture resistance values of the Snowlight thick samples were found to be higher than those of the Snowlight thin samples. The specimens were always fractured around the cemento-enamel junction at the palatinal side. No post fracture was observed for the thin Snowlight and Kerr Connect specimens or for the thick Postec and Kerr Connect specimens. Among the common failure types of the specimens, the worst was observed to be the root fracture failure. The highest post dislodgement failure result (80%) was obtained from the thin Kerr Connect specimen. CONCLUSION. In terms of optimizing fracture resistance, the fiber post size selection should be done according to the forces applied to the restored teeth.Publication Metadata only Factors triggering the oral mucosal lesions by complete dentures(ELSEVIER IRELAND LTD, 2010) TÜRKER, ŞEBNEM BEGÜM; Turker, Sebnem Begum; Sener, Isil Damla; Kocak, Ayse; Yilmaz, Sertan; Ozkan, Yasemin KulakOral mucosal lesions may represent acute or chronic reactions to factors related with dentures. The aim of this study was to determine the frequency of the oral lesions related to gender, age, the length of time of denture usage, the balance of denture and cleaning methods and frequency. The 106 patients who have old complete dentures came to the Dental Faculty of Marmara University, Istanbul (Turkey) to have new complete dentures were asked to participate in the investigation. The subjects (51 men and 55 women) were 37-80 years of age with a mean age of 60.28 +/- 10.52 years. All main factors were estimated in subgroups: cleaning methods and frequency were divided into 3 subgroups respectively as toothbrush and toothpaste/soap, denture cleansing tablets and sodium carbonate, and 3 times a day, everyday, every 3 day and once a week. The data obtained was evaluated by One-way ANOVA, Mann-Whitney U-test, Kruskal-Wallis-test, Student t-test and chi(2)-test. The level of statistical significance was set at p < 0.05. The patients displayed statistically significant differences in the topics of the length of time of denture usage and the balance of denture in terms of retention. The complete denture wearers should be educated in the importance of periodic examination due to the changing of supporting tissues for detection early mucosal lesions to maintain their oral and dentures hygiene in optimum level. (C) 2009 Elsevier Ireland Ltd. All rights reserved.Publication Open Access In Vitro Gap Changes After Porcelain Firing Cycles of Three and Four Unit of CAD/CAM Milling, Laser Sintering and Cast Metal Ceramic Restorations(MARMARA UNIV, INST HEALTH SCIENCES, 2019-06-30) TÜRKER, ŞEBNEM BEGÜM; Keles, Muhammed Abdullah; Turker, Sebnem BegumObjectives: Marginal adaptation changes during the veneering process is an important factor in the clinical success of metal framework techniques such as conventional cast metal cores (LW), CAD-CAM Metal Milling (MM) and Direct Metal Laser Sintering (DMLS). The aim of this study is to evaluate the marginal fit changes between three- and four-unit's metal ceramic fixed partial dentures (FPD's) fabricated by Lost Wax (LW), CAM Metal Milling (MM) and (Direct Metal Laser Sintering) DMLS metal framework techniques after porcelain firing cycles (PFC). Methods: A total of 60 stainless steel three and four unit FPD's models were fabricated. Specimens were randomly divided into three groups to fabricate metal ceramic FPD's frameworks with LW, MM and DMLS techniques. Before and after PFC, cross-sections from silicone replicas were obtained, sectioned, examined and measured with a light microscope. The statistical analysis was done with Mann-Whitney U and Kruskal Wallis and Wilcoxon Signed Ranks tests. Results were evaluated at 95% of confidence interval and p<0.05 level. Results: There was a statistically significant difference between the three and four unit of FPD's, before PFC for LW and MM (p:0.000) and DMLS (p:0.019)'s groups and only DMLS (p:0.006)'s group was statistically significant after PFC. The mean marginal gaps of LW technique was higher than the MM and DMLS's techniques before PFC. After PFC, DMLS's technique results were higher than LW and MM technique but, no statistically significant difference was found between the marginal gap values of the three and neither for four units of DMLS's FPD's. Conclusion: PFC decreases the mean marginal gap of the LW and MM group, but, there was a slight increase for DMLS group. However, all the marginal gap values obtained were in clinical acceptance level for three and four-units FPD's for all tested specimens.