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Öğe Comparison of load-bearing capacities of 3-unit fiber-reinforced composite adhesive bridges with different framework designs(International Scientific Information, Inc., 2018) Tacir, İbrahim H.; Dirihan, Roda S.; Polat, Zelal Seyfioğlu; Salman, Gizem Ön; Vallittu, Pekka; Lassila, Lippo; Ayna, EmrahBACKGROUND: The aim of this study was to investigate and compare the load-bearing capacities of three-unit direct resin-bonded fiber-reinforced composite fixed dental prosthesis with different framework designs. MATERIAL AND METHODS: Sixty mandibular premolar and molar teeth without caries were collected and direct glass fiber-resin fixed FDPs were divided into 6 groups (n=10). Each group was restored via direct technique with different designs. In Group 1, the inlay-retained bridges formed 2 unidirectional FRC frameworks and pontic-reinforced transversal FRC. In Group 2, the inlay-retained bridges were supported by unidirectional lingual and occlusal FRC frameworks. Group 3, had buccal and lingual unidirectional FRC frameworks without the inlay cavities. Group 4 had reinforced inlay cavities and buccal-lingual FRC with unidirectional FRC frameworks. Group 5, had a circular form of fiber reinforcement around cusps in addition to buccal-lingual FRC frameworks. Group 6 had a circular form of fiber reinforcement around cusps with 2 bidirectional FRC frameworks into inlay cavities. All groups were loaded until final fracture using a universal testing machine at a crosshead speed of 1 mm/min. RESULTS: Mean values of the groups were determined with ANOVA and Tukey HSD. When all data were evaluated, Group 6 had the highest load-bearing capacities and revealed significant differences from Group 3 and Group 4. Group 6 had the highest strain (p>0.05). When the fracture patterns were investigated, Group 6 had the durability to sustain fracture propagation within the restoration. CONCLUSIONS: The efficiency of fiber reinforcement of the restorations alters not only the amount of fiber, but also the design of the restoration with fibers.Öğe DİŞ HEKİMLİĞİNDE KULLANILAN YÜKSEK PERFORMANSLI POLİ-ARİL-ETER-KETON (PAEK) POLİMERLERİ(İstanbul Aydın Üniversitesi, 2022) Çakar, Verda Gökçe; Tacir, İbrahim Halil; Polat, Zelal SeyfioğluPoli-eter-eter-keton (PEEK) ve poli-eter-keton-keton (PEKK) yüksek performanslı poli-aril-eter-keton (PAEK) ailesinin en çok bilinen iki üyesidir. PEEK ve PEKK, keton ve eter fonksiyonel gruplarının birbirine bağlandığı aromatik polimer yapısında termoplastik materyallerdir. Tıbbı alanda kullanılan PAEK polimer ailesi, son zamanlarda diş hekimliği alanında da kullanılmaya başlamıştır. Diş hekimliğinde geleneksel olarak kullanılan metal altyapı materyalleri ile benzer mekanik özellikler göstermesi, bunlara ek olarak daha estetik restorasyonların üretilmesine olanak sağlaması, CAD/CAM teknolojisi ile üretilebilmesi, biyouyumlu olması gibi avantajlı özelliklerinden dolayı PAEK polimer ailesi metal restorasyonlara bir seçenek olmaktır. Diş hekimliğinde PAEK polimerlerinin kullanım alanı gün geçtikçe artmakla beraber, dental olarak kullanılan geleneksel materyallere alternatif olabileceğinden dolayı bu konu üzerine birçok araştırma yapılmaktır. Bu derlemenin amacı, diş hekimliğinde kullanılan PAEK polimerlerinin özelliklerini ve kullanım alanlarını araştırmaktır.Öğe DİŞSİZ ve ORAL DEFORMİTESİ BULUNAN HASTALARDA PROTEZ BOŞLUĞUNUN BELİRLENMESİNDE KULLANILAN FARKLI KAYIT YÖNTEMLERİ(Harran Üniversitesi, 2022) Çakar, Verda Gökçe; Polat, Zelal Seyfioğlu; Çakar, AzadGünümüzde total dişsizlik vakalarının artması sebebiyle, ileri derecede kemik rezorpsiyonunun olduğu implant uygulamasının mümkün olamadığı durumlarda; protezin stabilizasyonu önemli bir konu haline gelmektedir. Klinik uygulamalarda kemik rezorpsiyonun ileri derece olduğu durumlar dışında, nöromüsküler problemler ve maksillofasiyal defektlere sahip hastalarda da yapılacak olan protezin stabil olması ve oluşacak hasta memnuniyeti dikkat edilmesi gereken konulardandır. Bu nedenle protez boşluğunun belirlenmesi yapılacak olan protezin stabilizasyonunu arttırdığı gibi bunun yanında tutuculuk, konuşma, estetik ve çiğneme yeteneği gibi birçok faktörü arttırarak hasta memnuniyetini iyileştirmektedir. Bu derlemenin amacı; protez boşluğunun belirlenmesinde kullanılan kayıt yöntemlerinin ve etkinliğinin belirtilmesidir. Klinik uygulamalar için, protez boşluğunun belirlenmesinin rutin tedavi işlemlerine katkısının sağlanmasıdır.Öğe The effect of ytterbium-doped fiber laser on titanium fused to ceramic(Uluslararası Diş Araştırmaları Birliği, 2021) Tepe, İbrahim Halil; Nigiz, Remzi; Polat, Zelal Seyfioğlu; Ünal, Server MutluayAim: The aim of our study is to compare the application of fiber lasers with aluminum oxide sandblasting and CoJet, which is one of the other surface roughening methods used for the first time in this study. Investigating the effect of titanium–porcelain bond strength is another aim of this study. Methodology: In total, 96 samples of titanium discs (6 mm in diameter and 3 mm in height) were prepared in a CAD/CAM device. Samples were divided into six groups (n: 10), including the control group, according to the applied surface treatments: one-way (horizontal) scanning with a Yb fiber laser, twoway (horizontal-vertical) scanning with a Yb fiber laser, three-way (horizontal–vertical–hypotenuse) scanning with a Yb fiber laser, CoJet, sandblasting, and the control group. After using the different surface treatments on the titanium discs, scanning electron microscope (SEM) imaging, a wettability test, and a profilometer test were applied to the samples in each group. After the surface treatments were applied to the titanium discs, including those in the control group, low heat porcelain (VITA Titanium Porcelain), which was 4 mm in diameter and 3 mm in height, was applied according to the manufacturer's instructions. Afterwards, porcelain samples prepared with titanium inlays were placed in acrylic blocks and kept in 37°C (±1°C) distilled water for 24 hours. Shear tests were applied to the samples embedded in prepared acrylic blocks, and the results were evaluated. Results: In the statistical evaluation of the obtained data, one-way analysis of variance (one-way ANOVA) was used to compare the statistical differences of the mean values of the bond strength between titanium and porcelain. In our study, Tukey’s HSD and Dunnett’s multiple comparison statistical tests were used to determine the differences among the groups. Conclusion: According to the results of our study, the highest average bond strength values were obtained from sandblasting and three-way fiber laser roughness. As a result, no statistically significant difference was found among the groups. Although Yb fiber laser application was not found to have a statistically significant effect on titanium porcelain bond strength, this method could be useful for titanium porcelain bonding.Öğe Effects of different surface treatments on the compression-shear strength of CAD-CAM zirconia posts(Uluslararası Diş Araştırmaları Birliği, 2022) Eskitaşçıoğlu, Murat; Gündüz, Derya Toprak; Polat, Zelal Seyfioğlu; Başaran, Emine Göncü; Ayna, EmrahAim: Post systems are crucial for the treatment of endodontically treated teeth with excessive crown destruction. Currently, increase in esthetic demands has increased the use of tooth-colored post systems. The aim of this study was to evaluate compression-shear strength after the application of different resin cements and different surface treatments to zirconia post-cores produced by the CAD-CAM milling technique. Methodology: One hundred twenty crown parts of maxillary central incisors were cut using a 2-mm enamel–cement joint using a water-cooled diamond bur in an air turbine handpiece at 300,000 rpm. Root canals with the same diameter were prepared using Gates-Glidden drills and Snowpost system drills. According to the enlarged canal, zirconia posts were prepared by the CAD-CAM copy-milling technique, and the zirconia post surfaces were roughened by different techniques (hydrofluoric acid, Al2O3 partial abrasion, CoJet silica coating). The roughened posts were cemented to the tooth canal using three resin cements: 10- Methacryloyloxydecyl dihydrogen phosphate (MDP)-containing cement, Bis-GMA-based resin, and resin-based adhesive. As the control group, the zirconia post surfaces with no application were fixed using three resin cements. The specimens were set down into 25u25x25 mm fabricated blocks with acrylic resin materials. Compression-shear strength tests of the prepared samples were conducted on the Instron Testing Machine by using appropriate equipment. Results: In summary, the combination of roughening techniques such as Al2O3 partial etching and CoJet silica coating using cement-containing MDP rendered the highest compression-shear strength. Conclusion: This in vitro study proposes the cementation of zirconia post-cores etched by Cojet silica coating and Al2O3 particles using MDP- containing resin cement.Öğe Effects of surface treatment methods on the phase changes in zirconia(Uluslararası Diş Araştırmaları Birliği, 2021) Özdemir, Gökhan; Polat, Zelal SeyfioğluAim: In this study, zirconia was subjected to various surface treatments, namely, Al₂O₃ sandblasting, CoJet, and coating; the effects of these methods were investigated with the use of SEM, EDX, and XRD. Coating of zirconia surface with silica using the ultrasonic spray method is performed for the first time in this study. The present results are particularly important for the conduct of future studies. Methodology: Eighty-four zirconia samples were used for the XRD (n=28), SEM (n=28), and EDX (n=28) analyzes. Commercial semi-sintered discs (Kuraray-Noritake Katana HT10 14 mm, Japan) were used in this study. The size of the zirconia samples (i.e., 6 mm in diameter and 3 mm in height) was designed in a computer environment, factoring in the degree of shrinkage following sintering. The dimensions of the sintered samples were determined with a digital caliper. Four surface treatments were employed in this study. Results: The surfaces of the zirconium samples subjected to different surface treatments were investigated. The SEM and EDX images of the treated zirconia were taken at 80×, 250×, 1000×, 10,000×, and 20,000× magnifications and then compared with those of the untreated sintered samples. The XRD analysis results showed that the intensity of the peaks of the zirconium oxide samples at the 2θ range of 20°–40° varied from the tetragonal phase to the monoclinic phase along the surface. Conclusion: The sandblasting and CoJet surface treatments caused mechanical changes on the surface of the zirconia samples, and Al₂O₃ particles were detected on the surface, as shown by the SEM and EDX analysis results. The XRD analysis results for the blasting group differed the most from the results for the control group; by contrast, the results for the ultrasonic spray group were nearly the same to those for the control group.Öğe Evaluation of bond strength of different repair methods applied in PEEK infrastructure restorations(SCI Printers & Publication INC, 2022) Yılmaz, Berivan Dündar; Çetinkaya, Numan; Polat, Zelal Seyfioğlu; Ünal, Server Mutluay; Tuncer, Mehmet CudiOBJECTIVE: To evaluate the appropriate intraoral repair procedures in PEEK (polyetheretherketone) restorations when there is a veneer fracture. STUDY DESIGN: The study groups were formed according to the presence or absence of fractured veneer material of PEEK restorations. PEEK specimens (N = 91) were prepared with CAD/CAM in dimensions of 5 x 5.4 x 13 mm and divided into 13 groups including the positive control group. 5000 thermocyclic was applied to the specimens, and then the repair bond strength (RBS) was made at a speed of 0.5 mm/min. The fracture surfaces of the specimens were examined under a stereomicroscope. SEM, EDX, XRD, AFM, and surface contact angle analyses were performed in terms of roughened surfaces of PEEK (N = 16). One-way ANOVA and independent sample t test were used for data analysis (alpha = 0.05). RESULTS: The efficiency of surface treatment, the roughness and wettability of the acid and Co-Jet groups have increased. Acid etching was found to be the most effective surface treatment. The RBS values of the Super-Bond groups in the repair procedures were found to be higher than the Visio.link group and were statistically significant (p = 0.002). When evaluating failure modes, the mode most encountered among all groups was the mixed mode, and least was the cohesive mode. CONCLUSION: The presence or absence of fractured veneer during the repair of PEEK-based restorations does not affect the values of repair bond strength, and RBS values were also not statistically significant.Öğe NÖTRAL BÖLGE KONSEPTİ İLE TOTAL PROTEZ ÜRETİMİ: BİR OLGU SUNUMU(Zonguldak Bulent Ecevit University, 2023) Çakar, Verda Gökçe; Polat, Zelal Seyfioğlu; Tacir, İbrahim HalilŞiddetli rezidüel kret rezorpsiyonu olan ve implant tedavisinin mümkün olmadığı hastalarda geleneksel total protez yapımı zorlaşmaktadır. Protezin stabilitesini ve uyumluluğunu artırmak için nötr bölge konsepti uygulanabilmektedir. Nötral alan konsepti, özellikle ileri kemik yıkımı olan hastalarda, fonksiyonel kuvvetlerin ortadan kaldırıldığı nötral bir alanda protez üzerine yapay diş yerleştirilmesi nedeniyle stabilizasyonu önemli ölçüde iyileştirmektedir. Bu olgu sunumu, implant tedavisinin mümkün olmadığı ileri derece kemik harabiyeti olan hastada nötral alan belirlenerek geleneksel tam protez üretimini göstermeyi amaçlamaktadır.Öğe Post uzunluğunun, post çapının ve simanın prefabrik post care sistemlerinde çekme (tensile) ve basma-kesme (compressive-shear) kuvvetlerine karşı retansiyona etkisinin in vitro olarak değerlendirilmesi(Dicle Üniversitesi, Sağlık Bilimleri Enstitüsü, 2002) Polat, Zelal Seyfioğlu; Altun, SuatBu çalışmanın amacı, prefabrik post-core sistemlerinde post uzunluğunun, post kalınlığının ve yapıştırma simanının retansiyona etkisinin in vitro olarak incelenmesidir. Çalışmada 360 adet tek köklü diş kullanıldı. Dişler % 5'lik formol solüsyonunda bekletildi. Dişlerin kronları, mine-sement hududundan 2 mm. kronalden olmak üzere frez ile uzaklaştırıldı. Çekme ve basma-kesme kuvvetleri uygulanması için dişler 180 tanelik iki gruba ayrıldı. Bütün dişlere endodontik tedavi uygulandı. Basma-kesme. kuvveti uygulabilmesi için dişler standart kalıplara gömüldü. Para-post sistemi, çinkopolikarboksilat siman, cam iyonomer siman ve kompozit esaslı siman kullanılarak simante edildi. Hazırlanan deneklere, Instron Test Cihazı'nda çekme ve basma-kesme kuvveti uygulandı. Veriler, Faktöriyel Varyans Analizi ve Duncan Çoklu Karşılaştırma Testi ile değerlendirildi. Sonuç olarak en fazla retansîyon değeri, 1 1 mm.' İlk post uzunluğunda elde edilmiştir. Post kalınlığı arttıkça, post retansiyonunda da artış olduğu gözlenmiştir. En fâzla retansiyonu çinkopolikarboksilat siman sağlamıştır.Öğe Prosthetic rehabilitation of a hypohidrotic ectodermal dysplasia patient: A case report(Uluslararası Diş Araştırmaları Birliği, 2021) Ayna, Emrah; Gökçe, Dersim; Polat, Zelal SeyfioğluAim: Ectodermal dysplasia is a rare hereditary disease that arises from a developmental disorder of 2 or more ectoderm-derived tissues. Ectodermal dysplasia is seen in 3 different types: anhidrotic, hypohidrotic, and hidrotic. Its anhidrotic and hypohidrotic types are the most common. This study presents the intraoral findings and dental treatment approach of a case diagnosed with hidrotic ectodermal dysplasia that demonstrates the typical characteristics of the disease, such as anodontia, hypohydrosis (reduced sweating), hypotrichosis (sparse hair), and loss of vertical dimension. Methodology: A 5-year-old male patient presented to the clinic of the Prosthetic Dental Treatment Department of the School of Dentistry at Dicle University on 25.10.2020 with complaint of missing teeth. A genetic analysis conducted in 2016 showed that he was a homozygous carrier of the p.Cys148Arg (c.442 T>C) mutation on the 5th exon of the ectodysplasin-A receptor (EDAR) gene. The mutation detected in the patient was associated with ectodermal dysplasia. An extraoral clinical examination revealed sparse hair, eyebrows, and eyelashes; soft, smooth, and dry skin; thin, linear wrinkles around the eyes and the lips; drooping, thickened lips; a sunken nose; fractured nails; hyperthermia due to lack of sweat glands; hyperkeratosis in the skin and soles of the feet; 2 nipples on one side of the chest; and reduced vertical facial height. An intraoral examination revealed anodontia; there were no teeth on the maxilla or the mandible and no radiographically identified tooth germ. Dry mouth due to a lack of sufficient saliva was another finding. Conclusion: In this case report, in the presence of anodontia, a removable total prosthesis, which is a non-invasive treatment option, was applied. Production of endosseous implants was postponed for a later time following the patient’s growth and development.Öğe Retentive force of three fiber-reinforced resin composite posts and a zirconia post cemented with two adhesive luting agents: In vitro study(Japanese Society for Dental Materials and Devices, 2007) Polat, Zelal Seyfioğlu; Tacir, İbrahim Halil; Eskimez, Şebnem; Çelik, Mehmet YusufBy means of a pull-out test, this study compared the retentive force of three fiber-reinforced resin composite posts and a zirconia post. These posts were cemented using two different dual-polymerizing adhesive resin luting agents. Forty freshly extracted canines were selected for the study. All tooth root were endodontically treated and the post spaces prepared. The posts were luted using luting agents according to the manufacturers' guidelines. A tensile force was applied, and all data were collected and analyzed statistically. Glass fiber posts that were luted with Panavia F (Group 3) had the highest median load (3.610 N), while zirconia posts that were luted with RelyX ARC (Group 8) had the lowest median load (0.926 N). Among the different post systems that were luted with Rely X ARC, significant differences were observed in their median tensile loads (p<0.047). When comparing between Panavia F and RelyX ARC of each post system, a significantly higher tensile load was seen with zirconia posts luted with Panavia F (Group 7) (p<0.032).Öğe SCREW AND CEMENTED PROSTHESIS SYSTEMS ON IMPLANT PROSTHESES(Dicle University, 2023) Çakar, Verda Gökçe; Tacir, İbrahim Halil; Polat, Zelal SeyfioğluIncreasing success rate in implant treatment brings with it developments in implant materials day by day. With the developments in implant applications, the selection of prosthetic superstructure becomes an important issue. In clinical applications, prosthetic structures on implants can be applied as screwed and cemented. Although both systems have advantages and disadvantages, the selection of the appropriate prosthetic superstructure is up to the clinician for the case. The purpose of this review; In clinical applications, it is aimed to compare cemented and screwed restorations in many ways and thus to guide the selection of the appropriate superstructure for the case.
