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Öğe Addition of a pontic to all-ceramic Turkom-cera fixed partial denture restorations(2013) Uludag, Bulent; Tokar, Emre; Polat, SerdarHigh-strength all-ceramic materials are commonly used in dentistry. When complications occur in an all-ceramic restoration, the restoration is usually replaced. This article describes the time-saving ability and cost-effectiveness of this novel technique for the addition of a pontic in two complicated clinical cases. Turkom-Cera™ [Turkom-Ceramic (M) Sdn. Bhd.] with aluminum oxide (99.98%) is an all-ceramic system that offers the option of addition of a new pontic to the sintered framework. The new pontic was cut off from an alumina blank [Turkom-Ceramic (M) Sdn. Bhd.], moistened, and attached to the framework using alumina gel [Turkom-Ceramic (M) Sdn. Bhd.]. The framework was veneered with veneering porcelain (Vita VM 7; VITA Zahnfabrik). The two cases presented here involving the addition of a pontic to sintered framework were followed up for at least 1 year. No complication was detected or reported by the patients. Alumina- and zirconia-based ceramics are particularly suitable for for all-ceramic restorations in high-stress bearing areas. However, replacement of a failed all-ceramic restoration is not the most practical solution, considering both cost and tooth-related factors. This attractive feature of the Turkom-Cera allows the repair of a fractured ceramic coping or the addition of a new pontic to restorations. © 2013 Dental Investigations Society.Öğe Assesment of normal color vision and color vision-deficient dentists success ratio on color evaluation(2012) Polat, Serdar; Tuncdemir, Ali Riza; Özturk, Caner; Tunçdemir, Makbule Tu?baObjectives: The aim of this study was to assesment of normal color vision and color visiondeficient dentists success ratio on color evaluation. Materials and Methods: Dentists who have minimum 3 years clinical experience and between 26-63 years old (n=90) were included for this study. Ishihara color blindness test was applied in all dentists before the test applying. Two pieces from each color totally 32 (13 mm × 2.4 mm) porcelain specimens were fabricated. There were 32 tabs were to be matched; the dentists were asked to mark the correct color code Results: Success rate of matching colors of color blind dentists was 33.92% ratio. The ratio in color vision dentists was 60.09%. Normal color vision dentists showed highest degree in matching at A3.5, B3, C4, D2 colors. Color vision-deficient dentists were unsuccessful in matching A1, B1, C1, B2, D2, A3 colors. Conclusions: Color vision-deficient dentists were less succesfull than normal color vision dentists in color matching.Öğe Comparison of the candida albicans and biofilm formation amount on natural tooth, porcelain and acrylic resin(2012) Tunçdemir, Ali Rıza; İnci, Melek; Özcan, Erhan; Polat, Serdar; Damlar, İbrahimAmaç: Bu çalışmada doğal diş, porselen ve akrilik rezin üzerinde kandida albikans tutulumu ve biofilim oluşumu kıyaslanmıştır. Gereç ve yöntem: Örnekler steril eküvion çubuklarla doğal, porselen ve akrilik dişlerin bukkal embrajurlerinden alınmıştır. Kandidaların biofilim oluşumları Mikropleyt yöntemiyle belirlenmiştir. Örnekler 0,5 ml steril fosfat tampon salin solusyonunda bekletilmiştir. Kolonilerin üremesi, türlerin mikrobiyoloji laboratuarında makroskobik ve mikroskobik özelliklerine ve bakteri türlerine göre kıyaslanmasıyla tanımlanmıştır. Bulgular: Diş, porselen ve akrilik yüzeyinde kandida albikans tutulumu ve biofilim oluşumu bakımından anlamlı bir fark bulunmuştur. Sonuç: Porselen üzerindeki kandida albikans tutulumu ve biofilim oluşması doğal diş ve akrilik üzerinden ve ayrıca doğal diş üzerinde akrilik üzerinden daha az olmuştur.Öğe Effect of air-flow polishing on surface roughness of composites and porcelains(2012) Tunçdemir, Ali Rıza; Yavuz, Mustafa; Polat, Serdar; Tunçdemir, Makbule Tuğba; Özcan, ErhanAmaç: Bu çalışmanın amacı, Air flow ile yapılan parlatmanın Porselen ve Kompozitlerin yüzey pürüzlülüğüne etkisini incelemektir. Materyal ve Method: Bu çalışma için bir hibrit bir nano-hibrit kompozit sistemleri kullanılmıştır. 2 mm kalınlığında ve 10 mm çapında olan deney grupları, metal destekli ve metal desteksiz porselenleri, mikrohibrit ve nanofil kompozitleri içermektedir. Materyal tipine göre her birinde 10 ar adet olmak üzere toplam 4 grup bulunmaktadır. Bulgular İki yönlü varyans analizi sonucuna göre örneklerde air flow uygulaması sonucunda bir farklılık görülmemiştir (P>0.05). T testi sonucuna göre gruplar arasında air flow uygulamasından önce ve sonrasına göre istatistiki olarak anlamlı sonuç bulunmuştur (P<0.05) fakat kompozit ve porselen grupları arasında yüzey pürüzlülüğü bakımından anlamlı bir farklılık gözlemlenmemiştir (P<0.05). Sonuç Air flow kolay ve daha az zaman alan bir tekniktir fakat restoratif materyaller üzerinde pürüzlü yüzeylere neden olur, bu yüzden air flow parlatması sonrasında restoratif materyallere tekrar cilalama işlemi uygulanabilir.Öğe The effect of repeated porcelain firings on corrosion resistance of different dental alloys(Korean Acad Prosthodontics, 2013) Tuncdemir, Ali Riza; Karahan, Ismail; Polat, Serdar; Malkoc, Meral Arslan; Dalkiz, MehmetPURPOSE. The aim of this study was to evaluate the effects of repeated porcelain firing process on the corrosion rates of the dental alloys. MATERIALS AND METHODS. Cr-Co, Cr-Ni and Pd-Ag alloys were used for this study. Each metal supported porcelain consisted of 30 specimens of 10 for 7, 9 and 11 firing each. Disc-shaped specimens 10 mm diameter and 3 mm thickness were formed by melting alloys with a propane-oxygen flame and casted with a centrifuge casting machine and then with the porcelain veneer fired onto the metal alloys. Corrosion tests were performed in quintuplicate for each alloy (after repeated porcelain firing) in Fusayama artificial saliva solution (pH = 5) in a low thermal-expansion borosilicate glass cell. Tamhane and Sheffe test was used to compare corrosion differences in the results after repeated firings and among 7, 9 and 11 firing for each alloy. The probability level for statistical significance was set at alpha=0.05. RESULTS. The corrosion resistance was higher (30 mV), in case of 7 times firing (Commercial). On the other hand, it was lower in case of 11 times firing (5 mV) (P<.05). CONCLUSION. Repeated firings decreased corrosion resistance of Pd-Ag, Cr-Co and Cr-Ni alloys. The Pd-Ag alloy exhibited little corrosion in in vitro tests. The Cr-Ni alloy exhibited higher corrosion resistance than Cr-Co alloys in in vitro tests. [J Adv Prosthodont 2013;5:44-501Öğe Evaluation of the fracture resistance of root filled thin walled teeth restored with different post systems(Elsevier Science Bv, 2019) Ozturk, Caner; Polat, Serdar; Tuncdemir, Makbule; Gonuldas, Fehmi; Sekar, EmreBackground: Restoration of the teeth with extensive root canals with different post systems is a challenge for clinicians. Evaluation of these systems is important for clinical success. The aim of this study was to compare the fracture resistance and fracture mode of endodontically treated thin-walled teeth which restored with different post systems. Methods: Eighty extracted and endodontically treated maxillary canines were divided into 4 groups (n = 20) and the thickness of the radicular dentin walls was reduced by using diamond burs. Each root was embedded in an autopolymerizing resin with a 0.25 mm layer of vinyl polysiloxane material to simulate the periodontal ligament. The subgroups were restored with one of the following post systems: only composite resin (Group 1), cast post (Group 2), glass-fiber post (Group 3), and I-TFC post (Group 4). The samples were subjected to a gradually increasing force (0,5 mm/min). The force required to fracture was recorded, and the data were analyzed with ANOVA, Tukey tests and Chi-Square test (p < 0.05). Results: The highest fracture resistance was recorded for Group 2, followed by the Group 3, Group 4, and Group 1. Differences in the fracture resistance of teeth were significant among the groups (p < 0.05). The fracture resistance of Group 4 was significantly different than the other tested post systems (p < 0.05). Conclusions: The lowest fracture resistance was recorded for Group 1, but among all post systems, Group 4 had the lowest fracture resistance. The fracture mode of the fiber posts (Radix and I-TFC posts) would permit repair of the tooth.Öğe Renk körü ve renk körü olmayan diş hekimlerinin renk seçimindeki başarı oranlarının değerlendirilmesi(2012) Polat, Serdar; Tunçdemir, Ali Rıza; Öztürk, Caner; Tunçdemir, Makbule TuğbaAmaç: Bu çalışmanın amacı, renk körü ve renk körü olmayan diş hekimlerinin renk seçimindeki başarı oranlarının değerlendirilmesidir. Gereç ve Yöntem: En az 3 sene klinik deneyimi olan, yaşları 26 ile 63 arasındaki diş hekimleri (n=90) çalışmaya dahil edilmiştir. Test uygulaması yapılmadan önce tüm bireylere İshihara renk körlüğü testi uygulanmıştır. Ivoclar Klasik renk skalası referans alınarak, her bir renkten 2 şer adet olmak üzere toplam 32 adet disk (13 mm x 2,4 mm) hazırlandı. Aynı renkte olan porselen örneklerin eşleştirilmesi istendi. Bulgular: Renk körü olan hekimler renkleri eşleştirmede başarı oranı 33,92 % dir. Renk körü olmayan diş hekimlerinde ise bu oran 60,09% dur. Renk körü olmayan diş hekimleri renk eşleştirmesinde sırasıyla A3.5, B3, C4, D2 renklerinde yüksek oranda başarı sağlamışlardır. Renk körü olan hekimler ise A1, B1, C1, B2, D2, A3 renklerinin eşleştirmesinde başarılı olamamışlardır. Sonuç: Renk körü olan hekimler renk seçiminde, renk körü olmayan hekimlere göre daha başarısız olmuşlardır.Öğe Repair bond strength of composite to Er,Cr:YSGG laser irradiated zirconia and porcelain surfaces(Elsevier, 2019) Tokar, Emre; Polat, Serdar; Ozturk, CanerBackground: Fracture or chipping are major concerning failures of an all-ceramic restoration. Repairing of the failure restoration using intra-oral technique is time saving and cost effective treatment modality. The present study was proposed to evaluate effect of Er,Cr:YSGG laser irradiation on shear bond strength between zirconia/porcelain and composite resin. Methods: Thirty zirconia and thirty zirconia based porcelain disc shape specimens were prepared. Three different surface treatment procedure were applied the specimens. For control groups (Group ZC and PC), instruction manual of an intra-oral porcelain repair system was followed. Different pulse rates of Er,Cr:YSGG laser irradiation (short and long pulses) were applied to zirconia and porcelain surfaces for other groups (Group ZS, ZL, PS, and PL). Porcelain repair kit was used to repair specimens using standard cylindrical teflon mold (2 x 2 mm). Repair bond strength of the repaired specimens was tested using a universal testing machine. Results: Highest mean bond strength value was observed at Group PC that was significantly higher than laser applied porcelain groups. Long pulse laser irradiation illustrated that increased mean bond strength compared to short pulse application on to the porcelain surface. Laser applied zirconia groups showed better mean bond strength than Group ZC, but differences between the groups were not statistically significant. Conclusion: Different modes of Er,Cr:YSGG laser irradiation enhanced repair bond strength of the composite resin to zirconia, but these were not significant. Following the instruction manual for surface treatment on the porcelain surface was better method than Er,Cr:YSGG laser surface conditioning.
