Diş Hekimliği Fakültesi Protetik Diş Tedavisi Anabilim Dalı Koleksiyonu

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https://hdl.handle.net/11468/10467

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Adhesion of conventional and simplified resin-based luting cements to superficial and deep dentin
(Clinical Oral Investigations, 2012) Özcan, Mutlu; Meşe, Ayşe
This study evaluated the bond strengths of conventional (chemically and dual-polymerized) and simplified resin-based luting cements with their corresponding adhesives to superficial dentin (SD) and deep dentin (DD). Recently extracted third molars (N = 70, n = 10 per group) were obtained and prepared for testing procedures. After using their corresponding etchants, primers, and/or adhesive systems, the conventional and simplified cements (Variolink II [group A, conventional], Bifix QM [group B, conventional], Panavia F2. 0 [group C, conventional], Multilink Automix [group D, simplified], Superbond C&B [group E, conventional], Clearfil Esthetic Cement [group F, simplified], Ketac-Fil [group G, conventional]) were adhered incrementally onto the dentin surfaces using polyethylene molds (inner diameter 3. 5 mm, height 5 mm) and polymerized accordingly. Resin-modified glass-ionomer cement (RMGIC) acted as the control material. Shear bond strengths (1 mm/min) were determined after 500 times of thermocycling. Kruskal-Wallis and Mann-Whitney tests were used to analyze the data (α = 0. 05). Bond strength (MPa) results were significantly affected by the cement types and their corresponding adhesive systems (p ≤ 0. 05). The shear bond strengths (MPa ± SD) for groups A-G were 14. 6 ± 3. 8, 18. 9 ± 3. 9, 5. 5 ± 4. 5, 3. 1 ± 3. 6, 1. 1 ± 2. 5, 15. 5 ± 2. 6, 7 ± 4. 3 and 7. 1 ± 5. 8, 15. 1 ± 7. 8, 8. 4 ± 7. 3, 7. 5 ± 7. 3, 4. 9 ± 5. 1, 12. 5 ± 2. 1, 6 ± 2. 6 for SD and DD, respectively. The level of dentin depth did not decrease the bond strength significantly (p > 0. 05) for all cements, except for Variolink II (p < 0. 05). On the SD, bond strength of resin cements with "etch-and-rinse" adhesive systems (Variolink II, Bifix QM, Super-Bond C&B) showed similar results being higher than those of the simplified ones. Simplified cements and RMGIC as control material showed inferior adhesion to superficial and deep dentin compared to conventional resin cements tested.
Clinical evaluation of complications in implant-supported dentures: A 4-year retrospective study
(International Scientific Information, Inc., 2017) Ülkü, Sabiha Zelal; Kaya, Filiz Acun; Uysal, Ersin; Gülsün, Belgin
Background: Implants that can be used in the prosthetic rehabilitation of full and partial edentulous patients are now frequently used due to advances in dentistry. Despite advanced methods of applications, failures and complications can still be seen. The aim of our study was to evaluate clinical prosthetic values and complications that occurred during 4-year follow-up in implant-supported restorations. Material/Methods: This retrospective study included 40 patients who received oral rehabilitation with an implant-supported prosthesis. A total of 162 implants were placed: 99 in the maxilla and 63 in the mandible. The prosthetic and surgical data were recorded. Data including prosthetic complications and implant loss were recorded and statistically analyzed using Cox proportional hazard regression analysis. Results: In total, 159 implants (98.14%) survived, 3 implants (1.86%) failed, and 100% of the protheses were successful. There were 62 dental implants used as abutments for removable dentures and 97 for fixed dentures. The most frequent prosthetic complications after placement of an implant-supported prosthesis were loss of retention, mucositis, abutment screw loosening, and fracture. Patient satisfaction after prosthesis use was also evaluated, showing that satisfaction was systematically increased. Conclusions: To minimize the frequency of complications, protocols must be established from diagnosis to the completion of treatment and follow-up of implant-supported prostheses, especially in terms of adequate technical steps and careful radiographic evaluation of the components.
Color stability of provisional restorative materials in different mouthwash solutions
(Hindawi Limited, 2022) Değer, Yalçın; Bakır, Metin; Demirci, Fatih; Deveci, Büşra
Purpose. This study is a comparison of the effects of temporary restorative materials (PRMs) on the color change that occurs due to the use of different mouthwash solutions in two time periods. Material and Methods. One hundred fifty disc-shaped specimens (10 mm × 2 mm) were fabricated with three PRMs chemically polymerized PMMA (Imident-I), chemically polymerized bisacrylic composite resin (Acrytemp-A), and CAD/CAM PMMA-based polymer (TelioCAD-T) according to manufacturers' instruction and using a CAD/CAM milling system (n = 10). CIE L∗a∗b∗ values of specimens were recorded before immersion. Samples were immersed in solutions (Distilled water-DW, Kloroben-CHX, Listerine Advanced White-LAW, Listerine Total Care-TC, and Listerine Zero-TCZ) in two time periods (t1, t2). Color measurements of the samples were made with the help of a spectrophotometer before and after they were removed in mouthwashes (VITA Easyshade V). Results. According to the statistical analysis results, significant differences were observed between the results obtained in our study. The highest roughness values in ΔE1 were seen in A-LAW (1.83) and the lowest in T-DW (0.61). In ΔE2, the highest roughness values were observed in I-LAW (2.70), and the lowest in T-DW (1.05). ΔE values of all obtained groups were found within clinically acceptable limits (ΔE < 3.7). Conclusions. The content of temporary restorative materials, the production technique, the type of mouthwash, and the immersion time of the restoration affect the color stability. Mouthwash with a whitening effect caused the most discoloration. Among the temporary restorative materials, it was the CAD/CAM material that best preserved its color stability.
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, Emrah
BACKGROUND: 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.
Güneydoğu Anadolu Bölgesi'nde diş destekli sabit protezlerde karşılaşılan başarısızlıkların değerlendirilmesi
(Mersin Üniversitesi Sağlık Bilimleri Enstitüsü, 2017) Meşe, Ayşe; Kale, Ediz; Özcan, Mutlu; Yıldız, Ayça Deniz; Kaya, Eylem
Amaç: Geleneksel diş destekli sabit protezlerin (GDSP) başarısızlığı pek çok araştırmaya konu olmuştur. Başarısızlıkların giderilmesi için yapılacak restorasyon ve bunun sonuçları hakkında öngörülü olunması önemlidir. Bu çalışmanın amacı GDSP’lerde başarısızlık düzeylerine ilişkin insidans sunmak ve prognoz açısından başarısızlık düzeyleri ile hasta cinsiyeti, yaşı, protez yapım materyali, üye sayısı ve kullanım süresi arasındaki ilişkiyi araştırmaktır. Yöntem: GDSP’sine bağlı şikayet ile başvuran 413 hasta muayene edildi. Protezlere ilişkin problemler, başarısızlık düzeyi sınıflaması kullanılarak cinsiyet, yaş, protez materyali, üye sayısı, ve kullanım süresi bakımından değerlendirildi. Aralarındaki ilişki, çapraz tablolar ile Pearson ki-kare, tekyönlü-ANOVA ve Spearman korelasyon testleri kullanılarak istatistiksel olarak analiz edildi (α=0.05). Bulgular: Başarısızlık sınıfı ile hasta cinsiyeti arasında ilişki bulunamazken (p>0.05), başarısızlık sınıfı ile protez yapım materyali arasında ilişki bulundu (p=0.014). Sınıf ile kullanım süresi, sınıf ile hasta yaşı ve sınıf ile protez üye sayısı arasında ileri düzeyde istatistiksel ilişki olduğu gözlendi (p<0,01). Yaş ile kullanım süresi (p<0.01) ve yaş ile üye sayısı arasında (p<0.05) da ilişki gözlenirken, kullanım süresi ile üye sayısı arasında ilişki bulunamadı (p>0.05). Sonuç: Bu araştırmanın sonuçları, belirgin GDSP şikayeti ile kliniğe başvuran hastaların, çözülmesi görece zor bir problemle hekimin karşısına çıkabileceğini, güncel olmayan yapım materyali kullanılmış GDSP’lerin yüksek sınıfta değerlendirilme ihtimalinin yüksek olduğunu, uzun süreli kullanımda olan GDSP’lerde başarısızlık şiddetinin yüksek olacağını, protez üye sayısı ve hasta yaşı arttıkça GDSP’lerde gözlenen başarısızlık düzeyinin artacağını göstermiştir.
Comparative stress analysis of custom-made PEEK dental post-cores versus conventional post-cores in incisor restorations: A finite element study
(International Scientific Information, Inc., 2023) Yıldız, Şemsettin; Tekin, Samet; Kızılkaya, Ayşe Rençber; Akgün, Semih Ercan; Değer, Yalçın
Background: We conducted a finite element analysis to evaluate stress levels in incisor teeth restored with custom polyetheretherketone (PEEK) dental post-cores compared to conventional post-cores. Material/Methods: Using micro-computed tomography (μCT) imaging data, a 3D model of a maxillary incisor was created. For each material type, 3D mesh models were developed via specialized software. Two post diameters, 2.5 mm and 3.5 mm, were considered. Five different post materials were examined: Unfilled polyetheretherketone (Group UP); Glass fiber-reinforced polyetheretherketone (Group GP); Carbon fiber-reinforced polyetheretherketone (Group CP); Metal (Group M); and Zirconia ceramic (Group Z). Each model underwent finite element analysis, after which the von Mises equivalent stress values were determined. Results: For models involving both wide and narrow diameter posts across the crown, crown cement, post cement, and dentin, PEEK posts (Group UP, GP, and CP) exhibited higher von Mises stress values than Groups Z and M. However, the reverse trend was noticed in the post model itself. In the post cement model, stress values appeared similar only for the narrow-diameter post groups. Notably, results for Groups Z and M were largely consistent with each other. Conclusions: PEEK posts, which have a lower modulus of elasticity, demonstrated different stress values when contrasted with zirconia and metal posts. As the post diameter expanded, the residual dentin decreased, influencing the stress values among various materials. Further in vitro and clinical examinations are essential to comprehensively understand PEEK posts.
Effects of crown retrieval on implants and the surrounding bone: A finite element analysis
(Korean Academy of Prosthodontic, 2016) Özkir, Serhat Emre; Ünal, Server Mutluay; Yürekli, Emel; Güven, Sedat
PURPOSE. The aim of this study was to observe stress concentration in the implant, the surrounding bone, and other components under the pull-out force during the crown removal. MATERIALS AND METHODS. Two 3-dimensional models of implant-supported conventional metal ceramic crowns were digitally constructed. One model was designed as a vertically placed implant (3.7 mm × 10 mm) with a straight abutment, and the other model was designed as a 30-degree inclined implant (3.7 mm × 10 mm) with an angled abutment. A pull-out force of 40 N was applied to the crown. The stress values were calculated within the dental implant, the abutment, the abutment screw, and the surrounding bone. RESULTS. The highest stress concentration was observed at the coronal portion of the straight implant (9.29 MPa). The stress concentrations at the cortical bone were lower than at the implants, and maximum stress concentration in bone structure was 1.73 MPa. At the abutment screws, the stress concentration levels were similiar (3.09 MPa and 3.44 MPa), but the localizations were different. The stress at the angled abutment was higher than the stress at the straight abutment. CONCLUSION. The pull-out force, applied during a crown removal, did not show an evident effect in bone structure. The higher stress concentrations were mostly observed at the implant and the abutment collar. In addition, the abutment screw, which is the weakest part of an implant system, also showed stress concentrations. Implant angulation affected the stress concentration levels and localizations. Clinical implications . These results will help clinicians understand the mechanical behavior of cement-retained implant-supported crowns during crown retrieval.
Dişhekimliğinde kullanılan Er: YAG lazerler
(Ege Üniversitesi Diş Hekimliği Fakültesi, 2018) Görüş, Zuhal; Meşe, Ayşe; Çetindağ, Merve Tokgöz; Evran, Ozan Erdost
Lazerler, 20 yıldır kullanımda olmalarına ve yapılan çok sayıda bilimsel araştırmaya karşın diş hekimleri için araştırma konusu olmaya devam etmektedir. Günümüzde lazerler, spesifik dalga boylarıyla geniş bir kullanım alanına sahiptirler. Lazer uygulamaları, henüz kullanılan tedavi prosedürlerinin yerini alamasalarda, kavite preperasyonu, hipersensitivite tedavisi, yüzey pürüzlendirme, diş beyazlatma, diştaşı temizliği, endodontik uygulamalar, kemik ablasyonu ve analjezide alternatif olarak kullanılabilmekte ve dişhekimliğinin önemli bir unsuru haline gelmektedir. Lazer teknolojisindeki gelişmelerle beraber her geçen gün lazerin dişhekimliğinde kullanımı ile ilgili olarak yeni olanaklar ortaya çıkmaktadır. Özellikle dental sert dokular üzerindeki etkileri ve kullanım olanakları üzerine çalışmalar devam etmektedir. Bu çalışmada lazerlerin dental sert dokular üzerindeki uygulamaları, Er: YAG lazerler ve özel PIPS (Photon Induced Photoacustic Streaming) uçları hakkında bilgi verilmeye çalışılmıştır.
Manyetik Rezonans Görüntülemenin diş hekimliğinde kullanımı ve dental materyallere etkileri
(Atatürk Üniversitesi Diş Hekimliği Fakültesi, 2018) Karaman, Tahir; Eşer, Bekir; Güven, Sedat; Yıldırım, Tuba Talo
Radyolojik görüntüleme yöntemlerinden biri olan Manyetik Rezonans Görüntüleme, hastalıkların tanısına çok önemli katkıları bulunmasından dolayı yaygın bir şekilde medikal alanda kullanılmaktadır. Bu görüntüleme tekniğinde kuvvetli manyetik alan oluşması ve vücutta bulunan metalik objelerin bu manyetik alandan etkileşimleri hasta açısından potansiyel sağlık riskleri oluşturabilmektedir. Diş hekimliği alanında yaygın bir şekilde kullanılan Dental implantlar, Ortodontik braketler ve teller, Metal destekli sabit ve hareketli restorasyonlar vb. gibi içeriğinde metal bulunan objelerin varlığında Manyetik Rezonans Görüntülemesi esnasında oluşabilecek manyetik alan etkileşimlerinin yeterince bilinmesi gerekir. Görüntüleme esnasında hasta açısından oluşabilecek riskleri en asgari düzeye indirebilmek için vücutta bulunan ve manyetik alandan etkilenen metalik objeler ile ilgili gerekli tedbirlerin alınması gerekir.
Farklı açılardaki farklı abutment materyallerinin kullanıldığı maksiller anterior tek diş implantlarda oluşan streslerin analitik olarak incelenmesi: Bir sonlu elemanlar analizi
(Türkiye Klinikleri Yayınevi, 2022) Kızmaz, Said Mirza; Beydemir, Köksal; Agüloğlu, Süleyman
Amaç: Çalışmanın amacı, maksiller anterior bölgelerde açılı titanyum ve zirkonya abutment kullanıldığı durumlarda, okluzal streslerin implant, abutment, restorasyon ve çevre dokularda oluşturduğu streslerin analiz edilmesidir. Bu sayede başarılı bir implant uygulaması için hangi materyallerin hangi açılarda daha başarılı olduğunun tespit edilmesi amaçlanmıştır. Gereç ve Yöntemler: Çalışmada stres analiz yöntemlerinden biri olan ve teknolojinin gelişmesiyle birçok alanda sıklıkla kullanılan sonlu elemanlar analizi yöntemi kullanılmıştır. Maksillar anterior tek diş implant destekli restorasyon modelleri titanyum ve zirkonya abutment materyallerinin implant ile 0° ve 25° açı yaptığı modeller bilgisayar ortamında hazırlanmıştır. Üç boyutlu olarak bilgisayar ortamında hazırlanan bu modellere çiğneme ve kesme kuvvetleri uygulanmış ve uygulanan bu kuvvetler sonucunda implantta, abutmentte, restorasyonda, implant vidasında, çevre kemik dokuda oluşan stresler incelenerek kıyaslanmıştır. Bulgular: Maksiller anterior tek diş eksikliklerinde zirkonya abutmentler 0° ve 25° açılı kullanımda kesme ve çiğneme kuvvetlerine karşı titanyum abutmentlere benzer stres birikimleri göstermiştir. Hem zirkonya hem de titanyum abutmentlerde 25° açılandırıldıklarında açısız kullanımına göre %30 oranında stres artışı görülmüştür. Abutment vidasında ise açılı kullanımda stresin 3 kat arttığı görülmüştür. Sonuç: Estetik beklentileri karşılamak için maksiller anterior bölgede kullanılan zirkonya abutmentler çiğneme ve kesme kuvvetleri karşısında oluşan stresler açısından titanyum abutmentlere benzer stresler oluşturduğundan hem açılı hem de düz kullanımının titanyum abutmentlerden farklı sonuçlar doğurmayacağı anlaşılmıştır. Abutment vidalarında 25° açılı kullanımda 3 kat fazla stres oluştuğu tespit edildiğinden tasarım ve materyal kalitesinin dikkate alınması gerektiği görülmüştür. Konu ile ilgili in vivo çalışmaların yapılması gerektiği düşünülmektedir.
The evalution of stress distributions in 3 and 5 unit dental and implant supported fixed zirconia restorations: finite element analysis
(Sivas Cumhuriyet Üniversitesi, 2015) Güven, Sedat; Eratilla, Veysel; Beydemir, Köksal; Dündar, Serkan
Purpose: In this study, it is aimed to compare the distribution of stress on teeth and implants in 3-and-5-unit-dental and implant supported zirconia restorations by using finite element analysis. Material and Method: Stress distribution formed in teeth and implants as a result of chewing forces was analyzed in dental and implant (Astra Tech Microthread Osseo Speed, Sweeden) supported models of zirconia restoration with 5-unit placed on the numbers of 43, 44, 45, 46 and 47 and with 3-unit placed on the number of 45, 46 and 47. The study was performed through static nonlinear analysis with the three-dimensional finite element analysis method. Results: The highest and the lowest stress were respectively found on the number of 45 and 47 in 3-unit tooth supported model. The highest and the lowest stress in 5-unit tooth supported model were respectively found on the tooth of number 45 and on the root apex of the implant of number 43. Stress accumulation was observed in the cervical portion of the implant in implantsupported models. Stress accumulation in the tooth-supported model was found less than in implant-supported modelsConclusion: The extreme forces on the dental and implant-supported restorations with increased units can reduce survival rate of restorations in mouth. In posterior restorations increased in the number of supported teeth and implant can reduce the destructive forces on teeth and implant and may allow longer period retention of the restorations in the mouth.
Sabit protezlerde altyapı materyalleri ve sınıflandırmaları
(Selçuk Üniversitesi Diş Hekimliği Fakültesi, 2021) Çelik, Hidayet; Başaran, Emine Göncü; Zengingül, Ali İhsan; Koçoğlu, Hatice
Protetik diş hekimliğinde eksik dişlerin tedavisi için yapılan sabitprotezlerde çeşitli altyapılara sahip restorasyonlar kullanılmıştır.Bunlardan en çok tercih edilen metal altyapılı seramikrestorasyonlardır. Metal alt yapılı porselen sistemlerinin sahipolduğu avantajların dışında bazı dezavantajlar da mevcuttur. Sabitprotetik restorasyonlarda bu eksiklikleri gidermek için metaldesteksiz porselen sistemleri geliştirilmiştir. Metal-seramikrestorasyon sınıflaması standardize edilip, Amerikan DişhekimleriBirliği (ADA)’nın tüm soy metal alaşımlar için kabul ettiği sınıflamakabul edilirken tam seramik sistemler için birden fazla sınıflamamevcuttur.Konvansiyonel metal seramik sistemlerdeki dezavantajlar,araştırmacıları farklı restorasyon arayışlarına yöneltmiştir. Estetik,alerjik sebepler ve dişeti sağlığı dikkate alındığında, elektro kaplama sistemi ve tam seramik sistemler günümüzdekonvansiyonel sisteme iyi alternatif oluşturmaktadırlar. Ni-Cralaşımlar, yüksek gerilme direnci, yüksek sertlik, düşük maliyet vedüşük yoğunluk gibi avantajlarıyla en çok tercih edilen alaşımlardırama kontrol edilemeyen oksit tabakası oluşumu, alerjik reaksiyonve döküm zorluğu gibi dezavantajları da mevcuttur. Döküm altınalaşımlar ise döküm netliği, iyi fiziksel özellikler, biouyumluluk gibiavantajlarına karşın maliyetinin yüksek olması nedeniyle sık tercihedilmemektedirler. Elektro-kaplama sistemi, altın alaşımlarlakarşılaştırıldığında daha düşük maliyete sahip olması ve üretimkolaylığı avantajları vardır.Estetik ve biyouyumluluk gibi özelliklerinden dolayı zirkonya, sabitbölümlü protezlerde sıklıkla tercih edilmektedir. Mekanik ve fizikselözelliklerinin kemik ve dentine benzerliğinden dolayı Polieter EterKeton dişhekimliğinde birçok alanda kullanılmaktadır. Fiber ile güçlendirilmiş rezin tutuculu köprüler, ekonomik olarakdaha kapsamlı tedavileri karşılayamayan ve uzayan tedaviprotokollerini kaldıramayan hastalarda, hasta başı tedavilerinde,uzun vadeli geçici sabit parsiyel protezlerde, başarılı bir şekildeuygulanmaktadır. Yapılan protetik tedavilerde; altyapı seçimi içinuygun endikasyonlar ve kontrendikasyonlar göz önündebulundurularak kullanılacak materyal değerlendirilmelidir.
Effects on alveolar bone of diabetes mellitus induced by streptozotocin in rats. Histopathologic and immunohistochemical study
(Universidad de la Frontera, 2018) Yılmaz, Nezih; Uysal, İbrahim; Eratilla, Veysel; İrtegün, Sevgi; Ferman, Rojda Güneş Uysal; Eratilla, Elif; Elbey, Hüseyin; Uysal, Ersin; Deveci, Buşra; Deveci, Engin
The purpose of this study was to investigate effects of diabetes mellitus (DM) on the alveolar bone with histopathological and immunohistochemical methods. Wistar rats were divided into two groups, control and diabetes group. Control group was fed standard rat chow and drinking water for 8 weeks. Single dose (Streptozotocin) STZ (55 mg/kg), was dissolved in sodium citrate buffer and introduced intraperitoneal injection. Diabetes group and control group were compared in terms of glucose values. The blood glucose concentration in diabetic rats was significantly high (p <0.05). In diabetes group; periodontal membrane and the dilation of blood vessels, hemorrhage has also been a significant increase in inflammatory cells. In the diabetes group, osteonectin showed positive expression in periodontal membrane and showed negative expression in osteocytes of alveolar bone. Osteopontin expression in fibroblast cells and periodontal membrane collagen fibrils was positive, alveolar cells, osteocytes and bone matrix bone was found positive. Diabetes results showed that there formed periodontitis; due to the increase in inflammation inhibiting bone formation delaying the development of early bone cells.
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, Emrah
Aim: 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.
Farklı yöntemlerle polimerize edilen protez kaide materyallerinin eğilme direncine farklı protez temizleme tabletlerinin etkisi
(Atatürk Üniversitesi Diş Hekimliği Fakültesi, 2020) Erdost, Evran Ozan; İzgi, Ayça Deniz
Amaç: Bu in vitro çalışmanın amacı, farklı protez kaide materyallerinin (Acron MC, Deflex ve Ivobase Hıgh-Impact) eğilmedirenci ve yüzey özelliklerine farklı protez temizleme tabletlerinin (Aktident, Corega ve Protefix) etkisini incelemektir.Materyal ve Method: Çalışmamızda farklı yöntemlerle polimerize edilen üç farklı protez kaide materyali (Acron MC, Deflex veIvobase Hıgh-Impact) ve üç farklı protez temizleme ajanı kullanıldı. Her bir akrilikten biri kontrol grubu olmak üzere, 13’er adetörnek içeren 4 grup oluşturuldu. 120 adet örnek eğme dayanımlarının incelenmesi için hazırlanırken her bir akrilikten 3’er adetise SEM değerlendirmesi için kullanıldı. Tüm örneklere termal döngü uygulaması (5000 döngü, 5-552 C) yapıldı. Oluşturulangruplar, distile su, Aktident, Corega ve Protefix temizleme tabletlerinin solüsyonlarında bekletildi. Eğme dayanım değerlerininölçümü için 7 gün boyunca 3 farklı temizleme tableti solüsyonunda bekletilen örnekler ile distile suda bekletilen kontrolgrubundaki örneklere üniversal test cihazı kullanılarak (Lloyd instruments ltd. Segensworth, Fareharm) üç nokta eğme dayanımtesti uygulandı ve değerler kaydedildi. Verilerin istatistiksel analizi için IBM SPSS Statistics versiyon 21 paket programı kullanıldı.Bulgular: Eğme dayanım test verilerinde en düşük değer Acron MC örneklerde, en yüksek değer ise Deflex örneklerde görüldü.Her bir materyal için ayrı ayrı solüsyonlar ile kontrol grubu arasında yapılan karşılaştırmada istatistiksel olarak anlamlı bir farkbulunamadı.Sonuç: Alkalen peroksit içerikli tabletlerin, kullanılan kaide materyallerinin elastikiyet modülünü anlamlı bir şekildedeğiştirmezken, yüzey pürüzlülüğünü arttırdığını söyleyebiliriz.
Diş hekimliğinde kullanılan bağlanma dayanımı test metotlar
(Atatürk Üniversitesi Diş Hekimliği Fakültesi, 2021) Elmas, Saygın; Başaran, Emine Göncü; İzgi, Ayça Deniz
Günümüz diş hekimliğinde, materyallerin yapışma kuvvetlerinin miktarını ölçmek için çeşitli metotlar geliştirilmiştir. Bağlanmadayanımı testleri bu amaç için yaygın olarak kullanılmaktadır. Bununla birlikte birçok bağlanma dayanımı test metodu vardır. Buyöntemlerin her birinin avantajları ve dezavantajları vardır. Mikro çekme ve mikro makaslama testleri daha hassas sonuçlarverebilir, ancak daha karmaşık test kurulumlarına ihtiyaç duydukları için bazı dezavantajlar meydana gelmektedir ve bu testyöntemlerinde standardizasyonun sağlanması zordur. Bu nedenle bağlanma dayanım testlerinin kendi aralarında kıyaslanmasızordur. Bağlanma dayanımı test metotları kullanılırken, testi yapan kişinin test cihazlarının standardizasyonunu bilmesi vestandardizasyon sorunlarının çözümünü yapabilmesi gerekmektedir.
Evaluation of microhardness of newly developed glass carbomer-based dental filling material
(Uluslararası Diş Araştırmaları Birliği, 2019) Arslanoğlu, Zeki; Kale, Ediz; Meşe, Ayşe; Altan, Halenur
Aim: This study measured the microhardness of a newly developed glasscarbomer dental filling material within the first 24 hours after setting andcompared it against that of two different glass ionomers, with and withoutheating during setting, and a resin-modified glass ionomer.Methodology: Six cavities were prepared on acrylic resin discs. PMMAblocks were randomly divided into six groups of six cylinders and eachcavity was filled with one of the tested materials according to their group.The groups were: Group1, Fuji Triage™ with heat; Group 2, GCP Glass Fill™;Group 3, Equia™ with heat; Group 4, Riva LC™; Group 5, Fuji Triage™; andGroup 6, Equia™. Microhardness was measured by the Vickers hardnessscale using a microindentation hardness tester at 2, 4, 6, 12 and 24 hoursafter initial setting of the materials.Results: Fuji Triage™ with heat applied during setting (Group 1) provedto be the hardest material, while Riva LC™ (Group 4) and GCP Glass Fill™(Group 2) were the softest. Heating the Fuji Triage™ during the initialsetting period significantly increased its physical strength after 24 hours.Conclusions: It was seen that microhardness of materials which used inour study was effected both time and heat.
Effect of different surface treatments on bond strength between zirconia posts and root surfaces
(Uluslararası Diş Araştırmaları Birliği, 2020) Yılmaz, Berivan Dündar; İzgi, Ayça Deniz
Aim: In recent years, especially with the increase in aesthetic demands, there has been a requirement to use the best aesthetic materials for dental restorations. These restorations are especially needed in those teeth that have crown loss due to a tooth fracture or extreme anterior tooth decay, post-core treatment has been applied as getting support by tooth roots. Current treatments involve removing the aesthetic disadvantages and making use of the strength resistance of various metals. In this case, zirconium, which is a white-coloured metal, is preferred. In this study, zirconia posts with different surface treatments were cemented to the root canal and bond strength was then evaluated. Methodology: Forty mandibular second premolar teeth were used in this study. Crowns of all teeth were removed to 14 mm from the enamel-cement margin by separation under irrigation. Root canals were cleaned, shaped and filled. Teeth were kept in distilled water while zirconia posts were prepared. Zirconia posts were divided into four groups according to the surface treatment methods as follows: a control group, a CoJet applied group, a sandblasting+laser group and an Er:YAG laser group. The Er:YAG laser was administered at 450 mJ at 10 Hz for 60 seconds with a 100-μs pulse duration. Surface-treated posts were bonded to the root canal with Panavia F cement. Cores were made with the standardized strip crowns. 5000 cycles, 5-55 °C thermal cycle applied with transition time at 5 seconds. For push-out tests, roots were embedded in translucent acrylic resin and coronal, middle third and apical sections were cut into 1.5-mm slices. The maximum load at failure was recorded for each specimen in newtons and then converted into megapascals (MPa). Each specimen was inspected with a scanning electron microscope (SEM) at a magnification of 100 X. Data were analysed using Games-Howell tests with a significance level of 0.05. Results: The coronal section from Group 3 had the highest mean push-out bond strength (18.01 MPa), while the apical section from Group 1 had the lowest (4.49 MPa). Surface treatments had no significant effect on the mean push-out bond strengths of zirconia posts (p > 0.05). However, dividing the root canal into three sections had a significant effect on bond strength (p < 0.05). When the results were evaluated for all groups, the push-out bond strength was highest in the coronal section, then in the middle third and the lowest in the apical section. Conclusion: The combined application (sandblasting+laser) had a significant effect on the push-out bond strength of zirconia posts. The root region also had a significant effect on bond strength and there was a significant difference between the apical and coronal sections.
Effects of surface treatment methods on the phase changes in zirconia
(Uluslararası Diş Araştırmaları Birliği, 2021) Özdemir, Gökhan; Polat, Zelal Seyfioğlu
Aim: 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.
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 Mutluay
Aim: 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.

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