Yurdanur Ucar
Cukurova University, Prosthodontics, Faculty Member
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Amac: Bu calismanin amaci poliamid ile polimetilmetakrilat protez kaide materyallerinin mikroorganizma tutulumu acisindan karsilastirilmasidir. Gerec ve yontem: Uc farkli protez kaide materyaline (Deflex, SR-Ivocap, Meliodent) ait... more
Amac: Bu calismanin amaci poliamid ile polimetilmetakrilat protez kaide materyallerinin mikroorganizma tutulumu acisindan karsilastirilmasidir. Gerec ve yontem: Uc farkli protez kaide materyaline (Deflex, SR-Ivocap, Meliodent) ait ornekler (n=7) toplamda 21 adet olacak sekilde 3x10x10 mm3 ebatlarinda uretici firmalarin onerisi dogrultusunda hazirlanarak etilen oksit gaz sterilizasyonu ile steril hale getirildi. Calismamizda en sik mikrofilm olusturma ozelligine sahip olan Streptococcus mutans bakterisi ve en sik proteze bagli stomatit etkeni Candida albicans mayasinin yuzey tutulumu arastirilmistir. Mikroorganizmalarin Mc Farland ayarlari yapilarak mL'sindeki mikroorganizma sayisi bilinen ayri tupler hazirlanmistir. Ornekler bu tuplerin icerisinde 15 dakika bekletilip, steril kabin icerisinde steril kurutma kagitlari uzerinde yaklasik 30 dakika kurumaya birakilmis ve daha sonra farkli tuplerdeki steril su icerisine atilmis ve vortekslenerek yuzeyindeki mikroorganizmalarin suya g...
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Conventional complete dentures (CDs) are one of the most frequently used treatment options for completely edentulous patients. 1,2 CDs have been conventionally manufactured with the lost wax method, where a heatpolymerized polymethyl... more
Conventional complete dentures (CDs) are one of the most frequently used treatment options for completely edentulous patients. 1,2 CDs have been conventionally manufactured with the lost wax method, where a heatpolymerized polymethyl methacrylate (PMMA) resin base material and conventional denture teeth are used. 3,4 However, complaints about poor retention, mastication deficiencies, and dissatisfaction with stability are common with CDs, 4 as is debonding of denture teeth from the denture base. 4-6 It has been estimated that 22% to 30% of denture repairs, particularly in the anterior area, are caused by debonding of the teeth from the denture base. 7 The physical engagement and chemical bond between the denture teeth and the denture base resin polymer create an effective bond between them. 8-12 The base and the teeth are fabricated separately, and they may have distinct compositions because of the different processing techniques used. Different types of denture teeth, including conventional acrylic resin Funding: This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors. No Conflict of Interest.
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SUMMARY Objective: The purposes of this study were to compare the internal fit of copy-milled and conventionally cast crowns and evaluate the effect of porcelain firing cycles on crown fit. Material and Method: Gypsum duplicates were made... more
SUMMARY Objective: The purposes of this study were to compare the internal fit of copy-milled and conventionally cast crowns and evaluate the effect of porcelain firing cycles on crown fit. Material and Method: Gypsum duplicates were made from prepared tooth. Metal frameworks were established using conventional casting method and copy milling technique (N=15 per group). Metal frameworks were cemented on gypsum dies using light body additional silicone before and after porcelain application using finger pressure. Weight of silicone material was measured. The cement thickness of metal frameworks was compared 3 dimensionally. The crowns were later recemented on gypsum dies using polycarboxylate cement, embedded in resin and sectioned longitudinally in labio-lingual direction. The internal gap width was measured on sectioned specimens on five different points using stereomicroscope. T-test was used for statistical analysis ( α=0.05 ). Results: The mean silicone weight of metal frameworks were 14.04 ± 1.21 mg and 11.45 ± 1.14 mg, respectively, for copy-milled and cast frameworks. An increase in silicone weight was observed after porcelain firing cycles for both copy-milled (15.56 ± 1.59 mg) and cast groups (13.16 ± 3.05 mg). The cement thickness of sectioned specimens were higher in copy milled group (232 ± 120 µm) compared to conventionally cast group (140 ± 48 µm). Significant differences were observed between two methods for all comparisons (p< 0.05). Porcelain firing application caused an increase in cement thickness. Conclusion: Although statistically significant differences were observed between conventionally casting and copy milling techniques, whether the difference is significant for clinical applications should be further evaluated. Porcelain application increases the cement film thickness.
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Ainac: Metal-seramik baglantisi, restorasyonun basarisini etkileyen baslica faktorlerden biridir ve bu baglantinin guclu olmasinda oksit tabakanin payi buyuktur. Opak porseleni metal yuzeyinde olusan oksit tabaka ile isisal islem... more
Ainac: Metal-seramik baglantisi, restorasyonun basarisini etkileyen baslica faktorlerden biridir ve bu baglantinin guclu olmasinda oksit tabakanin payi buyuktur. Opak porseleni metal yuzeyinde olusan oksit tabaka ile isisal islem sonucunda birlesir. Bu calismanin amaci, baglanti materyallerinin metal seramik baglantisi uzerine etkisini karsilastirmali olarak incelemektir Gerec ve Yontem: Calismada bes farkli baglanti materyali (Ceramco; Grup C, Ivoclar; Grup I, Keramik; Grup K, Realite: Grup R, Vita; Grup V (kontrol)), metal alasimi (Remanium) ve dentin porseleni (Vita VMK 95) kullanilmistir. Silindirik orneklerin porselen kisminin boyutlari 4x4mm, metal kisminin boyutlari ise tabam 5x1 mm ve porselenle birlesecek kismi 4x4mm seklindedir. Hazirlanan 40 ornek, lmm/dak hizla makaslama kuvvetine maruz kalmistir. Baglanti kuvvetlerinin degerleri AN OVA ve ardindan Tukey coklu karsilastirma testleri kullanilarak test edilmistir (a=. 05). Kirik yuzeyler stereomikroskop ile incelenmistir Bulgular: Baglanti kuvveti yonunden gruplar arasinda istatistiksel acidan anlamli farkliliklar bulunmustur(P<0.0001). Grup C'nin degerleri (925.12±46.08N) diger gruplardan daha yuksek oldugu gorulmustur. Grup 1(528.12 ± 41.02 N) ve Grup V(528.25±37.29N) arasinda da anlamli bir fark gorulmezken, her iki grubun, grup C, grup R(605.88±39.77N) ve grup K(643.12± 63.15N)'dan anlamli sekilde dusuk oldugu izlenmistir Kirik yuzey goruntuleri gruplar arasinda benzerlik gostermistir Sonuc: Metal seramik reatorasyonlarin yapiminda baglanti materyalinin onemi unutulmamalidir ve kullanilan metal seramik sistemlerine uygun baglanti materyalinin secimi gerekmektedir.
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Objectives: The bond strength and elongation amount of different soft lining materials were evaluated in the current study. Material and Methods: Following the flasking of wax specimens in dental stone, wax removal and processing of... more
Objectives: The bond strength and elongation amount of different soft lining materials were evaluated in the current study. Material and Methods: Following the flasking of wax specimens in dental stone, wax removal and processing of polymethylmetacrylate (Meliodent) denture material, 3 different soft relining materials (Molloplast-B, Mollosil Plus, Vertex Soft) were placed within the space prepared in the center of polymethylmetacrylate (PMMA) specimens ( n =8). Using a crosshead speed of 5mm/min, tensile test was continued until failure was occurred. Mean tensile strength (MPa) and mean elongation (mm) was measured. Data was analyzed using one-way ANOVA and Tukey multiple comparison test ( α =0.05). Results: Significant differences were found among the tensile bond strength results ( p 0,05). Uzama miktari akrilik esasli yumusak astar materyali icin 6 (2,1) mm, otopolimerize silikon materyali icin 7,1 (1,8) mm, isi ile polimerize olan silikon materyali icin ise 4,8 (2,3) mm bulunmustur. Sonuc: Isi ile polimerize olan akrilik ve silikon esasli yumusak astar malzemelerinin baglanma dayanimlari degerleri birbirine cok yakindir. Otopolimerizan silikon esasli yumusak astar materyalinin baglanma dayanimi daha dusuktur. Gruplarin uzama miktarlari acisindan bir fark bulunamamistir. Anahtar kelimler: Yumusak astar, kaide materyali, baglanma dayanimi, uzama miktari
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Even though laser sintering and rapid manufacturing are popular in dentistry, mechanical properties of the corresponding material should be investigated before clinical application. Objective: To compare mechanical properties of... more
Even though laser sintering and rapid manufacturing are popular in dentistry, mechanical properties of the corresponding material should be investigated before clinical application. Objective: To compare mechanical properties of laser-sintered Co\u2013Cr alloy with cast Ni\u2013Cr and Co\u2013Cr alloys. Methods: Fifteen specimens were prepared according to ISO 22674 standards for each group. Tensile testing was performed on a universal testing machine to obtain tensile strength, percent elongation and yield strength. Each specimen was tested with a crosshead speed of 1 mm/min until the fracture occurred. Statistical analysis was performed using ANOVA followed by Tukey test. Fractured specimens were observed with stereomicroscope and scanning electron microscope. Finally, fractured halves of each specimen were linked to measure percent elongation. Results: The yield strength of specimens were 344,8 \ub1 40.5 MPa for cast Co-Cr group, 245.9 \ub1 65.9 MPa for cast Ni-Cr group and 375.6 \ub1 35.9 MPa for laser-sintered Co-Cr group. While there was a significant difference between cast Co-Cr and cast Ni-Cr specimens (P<0.001), no statistically significant difference was found between cast Co-Cr and laser sintered Co-Cr (P=0.329). The ultimate tensile strength was highest for the laser-sintered specimens (1143,9 \ub1 38,7 MPa) and there was no significant difference between cast Ni-Cr (439.6 \ub1 58.1 MPa) and Co-Cr (450.6 \ub1 85.7 MPa) specimens (P=0.910). For elongation, significant differences were found among three groups. Percent elongation values were 13 \ub1 2 for cast Co-Cr alloy, 34 \ub1 8 for cast Ni-Cr alloy and 11 \ub1 1 mm for laser sintered Co-Cr alloy. The cast Ni-Cr specimens showed the highest value and a significant difference was found between the cast and laser sintered Co-Cr alloys (P<0.001). Conclusions: Mechanical properties of laser-sintered specimens were comparable to the cast alloy groups. Further research has to be established before common clinical application
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THIS STUDY WANTS TO EVALUATE THE APPLICATION OF SLS PROCESS FOR OBTAINING FINAL DENTAL PROSTHESIS IN CR-CO ALLOY, DEVELOPING EXPERIMENTAL PLAN WITH THE PURPOSE TO MADE A COMPARATIVE ANALYSIS OF MECHANICAL CHARACTERISTICS BETWEEN CASTS... more
THIS STUDY WANTS TO EVALUATE THE APPLICATION OF SLS PROCESS FOR OBTAINING FINAL DENTAL PROSTHESIS IN CR-CO ALLOY, DEVELOPING EXPERIMENTAL PLAN WITH THE PURPOSE TO MADE A COMPARATIVE ANALYSIS OF MECHANICAL CHARACTERISTICS BETWEEN CASTS PARTS AND SINTERED ONES PRODUCTED WITH DIFFERENT ALLOYS AND PROCESSES
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ABSTRACT Objectives: Laser sintering has become very popular in dentistry in recent years. Mechanical properties of this given material has been evaluated by our research group in previous studies. The purpose of this study was to... more
ABSTRACT Objectives: Laser sintering has become very popular in dentistry in recent years. Mechanical properties of this given material has been evaluated by our research group in previous studies. The purpose of this study was to evaluate the fracture surface of laser-sintered Co–Cr alloy and compare with cast Ni–Cr and Co–Cr alloys and to associate the fracture surfaces with mechanical properties of these alloys which had already been previously presented. Methods: Fifteen specimens were prepared according to ISO 22674 standards for each group. Tensile testing was performed on a universal testing machine to obtain tensile strength, percent elongation and yield strength. Each specimen was tested with a crosshead speed of 1 mm/min until the fracture occurred. Statistical analysis was performed using ANOVA followed by Tukey test. Fractured specimens were observed with stereomicroscope and scanning electron microscope. Finally, fractured halves of each specimen were linked to measure percent elongation. Results: Based on our previous study, fracture surfaces showed correlation with the mechanical properties of this three alloys. While laser sintered Co-Cr alloy group, which have the highest yield strength, showed brittle nature of characteristics on fracture surface, the fracture surface of cast Ni-Cr group consists a combination of brittle and ductile fracture characteristics. The cast Co-Cr alloy fracture surface, showed also correlation with its mechanical properties. Conclusions: Mechanical properties of laser-sintered specimens were superior to the cast alloy groups and fracture surfaces of these alloys were associated with their mechanical properties.
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STATEMENT OF PROBLEM Laser sintering devices have been increasingly used to fabricate the metal frameworks of metal-ceramic restorations. In the fabrication process, the sintering layer thickness is an important parameter; however,... more
STATEMENT OF PROBLEM Laser sintering devices have been increasingly used to fabricate the metal frameworks of metal-ceramic restorations. In the fabrication process, the sintering layer thickness is an important parameter; however, information on how it may affect the flexural strength of metal frameworks remains limited. PURPOSE The purpose of this in vitro study was to evaluate the flexural strength of 3-unit and 4-unit cobalt-chromium (Co-Cr) metal frameworks laser sintered with 20-μm, 30-μm, and 40-μm layer thicknesses. MATERIAL AND METHODS Three-unit and 4-unit master metal die models with premolar and molar abutments were prepared through direct metal laser sintering (DMLS). A total of 40 metal frameworks (n=10 for each metal die model) were fabricated by the lost-wax technique (group C, served as the control group) and through DMLS with 20-μm, 30-μm, and 40-μm layer thickness (experimental groups LS20, LS30, and LS40, respectively). Each metal framework was cemented to a master die with a polyvinyl siloxane impression material and then subjected to a 3-point bend test at a crosshead speed of 1 mm/min. The yield force of each metal framework was used to calculate the flexural strength. Data were statistically analyzed by using 1-way ANOVA followed by a Tukey honestly significant difference (HSD) test and an independent-samples t test (α=.05) The microstructure of the fracture surface was evaluated by scanning electron microscopy. RESULTS Group C reported the lowest mean flexural strength (P<.05), whereas group LS20 reported the highest mean flexural strength, although no significant difference (P>.05) in flexural strength was observed among the DMLS groups. The 3-unit metal frameworks exhibited a statistically significant higher mean flexural strength than the 4-unit metal frameworks (P<.05). CONCLUSIONS The sintering layer thickness did not significantly affect the flexural strength of the laser-sintered metal frameworks. However, the DMLS groups reported a higher mean flexural strength than the cast group.
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Metal alloys have been used for many years as framework material of dental restorations. The conventional lost-wax and casting method, which was very popular in fabrication of metal frameworks, are now being replaced by computer-aided... more
Metal alloys have been used for many years as framework material of dental restorations. The conventional lost-wax and casting method, which was very popular in fabrication of metal frameworks, are now being replaced by computer-aided manufacturing technologies. Computer-aided manufacturing methods offer many advantages, such as standardization and quality in manufacturing, precise fit of restorations, and improved mechanical strength. Digital technologies used in fabrication of metal frameworks are simply classified as subtractive and additive computer-aided manufacturing systems, and each have their own subdivisions, which show differences in the used technology. This review summarizes computer-aided systems used in fabrication of metal frameworks in terms of use in dental practice, advantages, disadvantages and provides clinical recommendations.
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Objective: The aim of this study is to evaluate in vivo performance of cobalt-chromium/ceramic fixed partial dentures (FPDs) fabricated using CAD/CAM laser-sintering technology. The purpose is to assess technical and biological outcome... more
Objective: The aim of this study is to evaluate in vivo performance of cobalt-chromium/ceramic fixed partial dentures (FPDs) fabricated using CAD/CAM laser-sintering technology. The purpose is to assess technical and biological outcome compared to traditional cast metal-ceramic FPDs.Method: This retrospective study is conducted in a dental clinic that utilizes the Direct Metal Laser-Sintering (DMLS) CAD/CAM technique to fabricate metal-ceramic FPD since 4 years. The evaluation was taken during the periodical hygiene recall and follow-up.The FPDs were categorized in: 1) Single Dental Crown (1 dental unit) 2)Small Bridges (1-3 units) 3)Wide Bridges ( >3 units). An Evaluation Form was completed, using USPHS criteria to estimate quality and conditions of FPDs: Framework fracture, Veneering Fracture, Occlusal Wear, Marginal Adaptation, Anatomical Form (Alfa (A) to Delta (D) scale).A soft tissue and abutment analysis were also conducted to assess: Plaque Index (PLI), Bleeding on Probing (BoP), Gingival Recession (REC). Moreover the satisfaction of every patient was measured with a Visual Analogue Scale (VAS) with 10 levels.Result: This study is actually in progress. 35 patients with a total of 145 fixed dental prosthetic units were examined until now. The mean observation period is 14,7 \ub1 10,6 months (maximum: 44 months; minimum: 1 month). There were no framework fracture. 4 patients present 'veneering failures''. Three of these patients are affected by bruxism and parafunctional habits. 1 'wide bridge' (4 dental units) failed as a result of extraction after endodontic disease. The success rate is now 97,14%. The satisfaction rate is: 9,1 \ub11,12.Conclusion: Within the limitations of these preliminary results, DMLS FPDs are promising. Success rate is comparable to that found for cast metal-ceramic dental prostheses. Longer observation period and more dental units examination are required to validate these results
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Aim: To evaluate the effect of ceramic firing cycles on the internal and marginal discrepancy of restorations fabricated using conventional lost wax casting (LW), direct metal laser sintering (DMLS), and milling for soft metal (MS).... more
Aim: To evaluate the effect of ceramic firing cycles on the internal and marginal discrepancy of restorations fabricated using conventional lost wax casting (LW), direct metal laser sintering (DMLS), and milling for soft metal (MS). Materials and Methods: A total of 45 restorations were produced by LW, DMLS, and MS methods ( n = 15), according to the digital impression on the metal die representing the prepared first molar. The internal discrepancy (ID) was measured through the silicon weight method and the marginal discrepancy (MD) was measured using a light microscope. ID and MD measurements were repeated following the metal manufacturing, ceramic application, and glazing. Statistical analyses were conducted by means of two-way analysis of variance and Tukey-HSD ( α = 0.05) tests. Results: Statistically significant differences were found between the fabrication methods ( P ≤ 0.001) both for MD and ID. The mean MD values of the restorations were 31.4 ± 13.8 µm for MS, 20.8 ± 14.4 µ...
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STATEMENT OF PROBLEM Changing the internal design of a metal framework may decrease the manufacturing time, the weight of the restoration, and the amount of alloy powder used, as well as simplify the fabrication process. PURPOSE The... more
STATEMENT OF PROBLEM Changing the internal design of a metal framework may decrease the manufacturing time, the weight of the restoration, and the amount of alloy powder used, as well as simplify the fabrication process. PURPOSE The purpose of this in vitro study was to evaluate the effect of framework internal design changes on the mechanical properties of cobalt-chromium (Co-Cr) specimens manufactured by using direct metal laser sintering (DMLS). MATERIAL AND METHODS Dumbbell-shaped test specimens were designed as per the International Organization for Standardization (ISO) 22674(E) standard by using a 3-dimensional software program. A total of 70 dumbbell-shaped specimens were prepared by using Co-Cr alloy powder and DMLS (n=10). The control group specimens were solid with the internal completely filled. For the test groups, the internal design of the dumbbell-shaped specimens was modified. Leaving the outer shell thickness of the specimens at 0.5 mm for all test groups, 6 different internal designs were created, and the specimens were weighed. The tensile strength test was used to evaluate the mean peak strength, elastic modulus, and percentage elongation of the specimens. One-way ANOVA followed by the Dunnett T3 test was used for statistical analysis (α=.05). RESULTS A statistically significant difference was found among the groups in terms of bar weight and peak strength (P<.05). The highest values were observed in the control group for all evaluated parameters (mean ±standard deviation bar weight: 1321.3 ±36.6 mg, peak strength: 1045 ±36.7 MPa, elastic modulus: 284.2 ±71.9 GPa, and elongation: 28.7 ±7%). However, no statistically significant difference was observed for elastic modulus or percentage of elongation (P>.05). CONCLUSIONS Decreasing the weight of the frameworks by changing the internal design of the specimens also decreased the peak strength. However, it did not affect the elastic modulus or the percentage of elongation.
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Amac: Bu calismanin amaci lazer sinterize Co-Cr ve dokum yontemi ile elde edilen Ni-Cr ve Co-Cr alasimlarinin porselen ile baglantisini 3-nokta-bukme testi (3-Point-Bending; 3PB) kullanarak degerlendirmektir. Gerec-Yontem: Calismada metal... more
Amac: Bu calismanin amaci lazer sinterize Co-Cr ve dokum yontemi ile elde edilen Ni-Cr ve Co-Cr alasimlarinin porselen ile baglantisini 3-nokta-bukme testi (3-Point-Bending; 3PB) kullanarak degerlendirmektir. Gerec-Yontem: Calismada metal altyapi olarak 3 farkli grup kullanilmistir: lazer sinterize Co-Cr, dokum Co-Cr ve dokum Ni-Cr. Her grup icin 15 ornek ISO 9693(1999) standartlarina uygun olarak hazirlanmis ve 3PB testi kullanilarak baglanma dayanimi degerlendirilmistir. Veriler ANOVA ve sonrasinda Tukey cok yonlu karsilastirma testi kullanilarak degerlendirilmistir (α=0,05). Bulgular: Bukulme modulu ve ortalama en yuksek bukme dayanimi degerleri karsilastirildiginda her iki parametre icin 3 grup arasinda istatistiksel fark bulunmustur (P=0,0001). En dusuk ortalama bukulme modulu lazer sinterize grupta gozlenirken (77±6,5 GPa), en yuksek deger dokum Co-Cr grubunda (247±16 GPa) gorulmustur. Ikili karsilastirmalarda her 3 grup da birbirinden farkli bulunmustur. Ortalama bukulme daya...
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Purpose: The purpose of this study was to compare the mechanical properties of two different removable partial denture alloys that are commonly used in Cukurova University Faculty of Dentistry. Material and Methods: Using two different... more
Purpose: The purpose of this study was to compare the mechanical properties of two different removable partial denture alloys that are commonly used in Cukurova University Faculty of Dentistry. Material and Methods: Using two different Co-Cr alloys; Magnum H60 (MESA, Travagliato, Italy) and Biosil F (Degussa Dental, GmbH, Hanau, Germany) ten tensile test specimens were prepared for each group according to the ADA specification number 14. Specimens were loaded to crack. Ultimate tensile strength and percent elongation of two groups were compared using Mann Whitney U test (α=0.05). Crack surfaces were investigated using a stereomicroskop. Results: A statistically significant difference was found between ultimate tensile strength of Magnum H60 (828 ± 17.3 MPa) and Biosil F (782 ± 51.6) (α =0.01). Percent elongation of Magnum H60 and Biosil F were found as 6.77 ± 1.62 and 6.32 ± 2.38, respectively. No significant difference was found among the two groups when the percent elongation was ...
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Objective: Direct Selective Laser Sintering Method (SLS) that has been used over the past twenty years is an alternative contemporary technique to dental casting. The aim of this study was to compare the biocompatibility of laser sintered... more
Objective: Direct Selective Laser Sintering Method (SLS) that has been used over the past twenty years is an alternative contemporary technique to dental casting. The aim of this study was to compare the biocompatibility of laser sintered CoCr dental alloy with conventionally cast NiCr and CoCr dental alloys. Method: Specimens with 3mm diameter and 5mm height were prepared for cell culture tests (n=6/group) according to ISO 10993-5; 1999. The biocompatibility of groups were evaluated using Balb/C 3T3 mouse fibroblast cell culture’s kept in Dulbecco's Modified Eagle's Medium (DMEM) and mitochondrial activity assay (MTT) was used. Cells were kept at 37ºC, %95 humidity and %5 CO2 environments in T25 flask for 72 hours. The optical absorbance value was calculated. Cells were counted using Thoma lam and vitality test was conducted using trypan blue (Sigma, Munich, Germany). Cell culture results were compared using one-way ANOVA followed by the Tukey test (α= 0.05). Result: The op...
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The affordable Co-Cr cast alloy should provide an ideal interface with prefabricated cast-to cylinders from the same alloy family. The alloy microstructures should be maintained up to the interface, and porosities and reaction regions... more
The affordable Co-Cr cast alloy should provide an ideal interface with prefabricated cast-to cylinders from the same alloy family. The alloy microstructures should be maintained up to the interface, and porosities and reaction regions should be absent, and sufficient bond strength between alloys should be provided. The purpose of this in vitro study was to evaluate the metallurgical interfacial compatibility between Co-Cr dental casting alloys and a prefabricated Co-Cr dental implant cast-to-cylinder. A Co-Cr alloy was cast to Co-Cr implant cylinders. Specimens were cross-sectioned longitudinally and divided into as-cast and heat-treated groups. The microstructures of specimens were evaluated by optical and scanning electron microscopy. The elemental composition of as-received prefabricated implant cylinders and diffusion characteristics of cast interfacial regions were determined by energy dispersive x-ray spectroscopy. Vickers hardness values were defined across the interface on c...
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Objective: The aim of this study is to evaluate in vivo performance of cobalt-chromium/ceramic fixed partial dentures (FPDs) fabricated using CAD/CAM laser-sintering technology. The purpose is to assess technical and biological outcome... more
Objective: The aim of this study is to evaluate in vivo performance of cobalt-chromium/ceramic fixed partial dentures (FPDs) fabricated using CAD/CAM laser-sintering technology. The purpose is to assess technical and biological outcome compared to traditional cast metal-ceramic FPDs. Method: This retrospective study is conducted in a dental clinic that utilizes the Direct Metal Laser- Sintering (DMLS) CAD/CAM technique to fabricate metal-ceramic FPD since 6 years. The evaluation was taken during the periodical hygiene recall and follow-up. The FPDs were categorized in: 1) Single Dental Crown (1 dental unit) 2)Small Bridges (1-3 units) 3)Wide Bridges ( >3 units). An Evaluation Form was completed, using USPHS criteria to estimate quality and conditions of FPDs: Framework Fracture, Veneering Fracture, Occlusal Wear, Marginal Adaptation, Anatomical Form (Alfa (A) to Delta (D) scale). A soft tissue and abutment analysis were also conducted to assess: Plaque Index (PLI), Bleeding on Pr...
... restorative resins. Quintessence Int 1991; 22(9): 733-737. Yazışma Adresi: Yrd. Doç.Dr. Yurdanur Ucar Çukurova Üniversitesi Diş Hekimliği Fakültesi Protetik Diş Tedavisi Anabilim Dalı Tel: 0 506 401 7094 E-mail: ysanli@cu.edu.tr
... Yrd.Doç.Dr.Yurdanur UÇAR* Yrd.Doç.Dr.Cem KURTOĞLU ... Ancak bununla birlikte, kıymetsiz alaşımlar yüksek elastisite modülleri ve dayanıklılıkları, yüksek korozyon dirençleri, ve alternatifaltın alaşımlarına oranla çok daha ucuz... more
... Yrd.Doç.Dr.Yurdanur UÇAR* Yrd.Doç.Dr.Cem KURTOĞLU ... Ancak bununla birlikte, kıymetsiz alaşımlar yüksek elastisite modülleri ve dayanıklılıkları, yüksek korozyon dirençleri, ve alternatifaltın alaşımlarına oranla çok daha ucuz olmaları nedeni ile HBP yapımında sıklıkla tercih ...
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The objective of this prospective, controlled clinical study was to determine the outcomes of dental implant therapy with staged guided bone regeneration procedures in patients with type 2 diabetes. Twenty-four patients were included in... more
The objective of this prospective, controlled clinical study was to determine the outcomes of dental implant therapy with staged guided bone regeneration procedures in patients with type 2 diabetes. Twenty-four patients were included in the study. Half of the patients were diagnosed with type 2 diabetes mellitus (group 1) while the other half (group 2) of the patients consisted of patients without diabetes. The edentulous maxillary anterior/premolar regions with sufficient vertical height but inadequate horizontal width were treated with staged guided bone regeneration technique and with one or two implant-supported fixed restorations. The patients were followed up at least for 12 months. The parameters that were evaluated were radiographic evaluations on CBCT images and periapical radiographs, histomorphometric analysis, resonance frequency analysis (RFA) and wound-healing parameters. The data were analyzed statistically. A total of 43 implants were placed in 24 patients (22 implants in group 1 and 21 implants in group 2). The survival rates of implants were 100% for both groups. The success rate of implants was 95% for group 1 and 100% for group 2. None of the parameters including CBCT findings, RFA values, success rates and wound-healing scores showed a significant difference between the two groups. Staged guided bone regeneration is a feasible augmentation procedure for the treatment of horizontal bone deficiencies of the maxillary anterior/premolar regions in well-controlled type 2 diabetic patients.