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Mineral trioksit agregat'ın biyouyumluluğunun değerlendirilmesi

Koçak, Sibel | Erten, Hülya

Article | 2012 | Gazi Üniversitesi Diş Hekimliği Fakültesi Dergisi (.Acta Odontologica Turcica)29 ( 1 ) , pp.63 - 71

Mineral trioksit agregat (MTA), kök ucu dolgusu, pulpa kaplaması, perforasyon tamiri ve diğer endodontik yaklaşımlarda yaygın olarak kullanılmaktadır. MTA'nın biyouyumluluğu çok çeşitli yollarla; hücre baskılanması ve büyümesi, in vivo olarak cilt altı ve kemik içi implantasyon ve dental dokularla direkt temas yöntemleriyle araştırılmıştır. Bu derlemenin amacı, MTA'nın biyouyumluluğu hakkındaki genel bilgileri güncellemektir. Mineral trioxide aggregate (MTA) is widely used for root-end fillings, pulp capping, perforation repairs, and other endodontic procedures. The biocompatibility of MTA has been investigated in a number of ways, . . .using cell expression and growth, subcutaneous and intra-osseous implantation and direct contact with dental tissues in vivo. The aim of this review is to update the general knowledge about the MTA biocompatibility Daha fazlası Daha az

When do skeletal class III patients wear their reverse pull headgears?

Özkalaycı, Nurhat | Çiçek, Orhan

Article | 2017 | BioMed Research International2017 , pp.63 - 71

Objective. The aim of this study is to evaluate the factors that affect wearing time and patient behavior during reverse pull headgear therapy with a newly designed reverse pull headgear. Methods. In clinical practice, new reverse pull headgears were applied to fifteen patients. The patients were monitored during reverse pull headgear therapy and the data were evaluated. Statistical analysis was made. Results. During the study, patients were monitored successfully and the evaluations showed that patients wear the new reverse pull headgears mostly at night. There are differences between days of week and hours of day. Weekends are mor . . .e popular than weekdays for wearing reverse pull headgear. Conclusions. This new type of reverse pull headgears can be used successfully in clinical practice and can help the clinician. Study showed that the most important factor that affects the cooperation of reverse pull headgear patient is aesthetic appearance. © 2017 Nurhat Ozkalayci and Orhan Cicek Daha fazlası Daha az

Diş sürmesi

Gökçek, Dt Mihriban | Bodrumlu, Ebru Hazar | Özkalaycı, Nurhat

Article | 2016 | 7tepe Klinik12 ( 3 ) , pp.35 - 44

Diş sürmesi organizmada görülen gelişimsel bir süreçtir. Geçmişten günümüze bu sürecin işleyişi ile ilgili çok sayıda sürme teorileri ileri sürülmesine rağmen, sürmenin altında yatan mekanizmalar hiçbir zaman tam olarak anlaşılamamıştır. Diş sürmesi ile ilgili; dişlerin üç yönde hareket ediyor olması, farklı hızlarda sürmeleri ve fonksiyonel pozisyona ulaşmasının kalıtımın etkisi altında olması gibi temel parametrelerin biliniyor olması, önceden ortaya atılmış olan bazı teorileri elimine etmektedir. Diğer taraftan ise bu parametreler alveol kemiğin yeniden şekillenmesi ya da periodontal ligamentin oluşması gibi bazı teorilerin de de . . .steklenmesine yol açmaktadır. İnsan ve hayvan dokuları üzerinde yapılan çalışmalar diş sürmesinin analiz edilebilmesine olanak tanımıştır, fakat diş sürmesini harekete geçiren ya da sürme sürecini sona erdiren kuvvetin ne olduğu tam anlamıyla çözülebilmiş değildir. Sürmenin etiyolojisinin bilinmesi sürme problemlerinin çözümünde gerekli bir faktördür ve bu nedenle diş sürmesinin altında yatan mekanizmanın tam olarak anlaşılabilmesi için günümüzde çalışmalar devam etmektedir. Bu derlemenin amacı dişlerin sürmesinde etkili olan faktörlerin incelenerek ortaya atılmış olan sürme teorilerine genel bir bakış açısı sağlamaktır. Dental eruption is a developmental process in the organism. Various theories have been developed to explain the eruption mechanisms from past to present, but the mechanisms behind the eruption has not been completely understood. Our current knowledge about some basic parameters such as the genetic influence on the 3-dimensional movement of teeth at various speeds and arrival at a functional position have eliminated some previously proposed theories. On the other hand, this knowledge supports some theories such as the remodeling of the alveolar bone and formation of the periodontal ligament. Studies in human and animal tissues allow teeth eruption analyses, but what initiates and ends eruptive forces still is not known. Studies still continue to explain the mechanism behind eruption because understanding the mechanism of the eruption process is required for treating eruption disorders. The aim of this review is to examine the factors that affect tooth eruption and provide an overview of Eruption Theories past to present Daha fazlası Daha az

Periapical health related to the quality of coronal restorations and root fillings in Turkish population

Koçak, Sibel | Köktürk, Firuzan | Sağlam, Can | Koçak, Mustafa Murat

Article | 2013 | Cumhuriyet Dental Journal16 ( 4 ) , pp.261 - 266

Objectives: The aim of the present study was to evaluate the quality of root canal treatments and coronal restorations investigating their influence on the periapical status of endodontically-treated teeth in a Turkish population based on radiographic examination. Materials and Methods: The study included 583 patients referred for routine dental care. A total of 1125 endodontically treated teeth were examined with panoramic radiographs. The quality of root canal fillings and coronal restorations were evaluated according to the criteria determined by Gündüz et al., which were slightly modified from those described by De Moor et al. A . . .pical status was assessed by the Periapical Index (PAI) scores. Results: Out of 1125 endodontically treated teeth, 539 were classified as healthy and 586 as displaying apical periodontitis. Of these 539 subjects, 389 teeth had received quality endodontic treatment. Of 586 teeth with apical periodontitis, 500 had poor endodontic treatment. Four hundred and seventy-five teeth had adequate root canal fillings. Of these teeth, 389 were classified as healthy. Of the 666 teeth with adequate restoration, apical region was classified as healthy for 410 subjects. For the 388 teeth with both adequate coronal restorations and root canal fillings, the success rate was 85.3%. For the 372 teeth with both inadequate coronal restorations and root canal fillings, the success rate was 18.8%. Conclusions: The quality of root fillings in the population living in the back country of Turkey is in general below the acceptable standard and requires substantial improvement. Objectives: The aim of the present study was to evaluate the quality of root canal treatments and coronal restorations investigating their influence on the periapical status of endodontically-treated teeth in a Turkish population based on radiographic examination. Materials and Methods: The study included 583 patients referred for routine dental care. A total of 1125 endodontically treated teeth were examined with panoramic radiographs. The quality of root canal fillings and coronal restorations were evaluated according to the criteria determined by Gündüz et al., which were slightly modified from those described by De Moor et al. Apical status was assessed by the Periapical Index (PAI) scores. Results: Out of 1125 endodontically treated teeth, 539 were classified as healthy and 586 as displaying apical periodontitis. Of these 539 subjects, 389 teeth had received quality endodontic treatment. Of 586 teeth with apical periodontitis, 500 had poor endodontic treatment. Four hundred and seventy-five teeth had adequate root canal fillings. Of these teeth, 389 were classified as healthy. Of the 666 teeth with adequate restoration, apical region was classified as healthy for 410 subjects. For the 388 teeth with both adequate coronal restorations and root canal fillings, the success rate was 85.3%. For the 372 teeth with both inadequate coronal restorations and root canal fillings, the success rate was 18.8%. Conclusions: The quality of root fillings in the population living in the back country of Turkey is in general below the acceptable standard and requires substantial improvement Daha fazlası Daha az

Silver nanoparticle incorporation effect on mechanical and thermal properties of denture base acrylic resins

Köroğlu, Ayşegül | Şahin, Onur | Kürkçüoğlu, Işın | Dede, Doğu Ömür | Özdemir, Tonguç | Hazer, Baki

Article | 2016 | Journal of Applied Oral Science24 ( 6 ) , pp.590 - 596

Objective: The aim of the present study was to evaluate the mechanical and thermal characteristics of two denture base acrylic resins containing silver nanoparticles (AgNPs). Material and Methods: Two different acrylic denture base resins (heat-polymerized and microwave polymerized) containing 0.3, 0.8 and 1.6 wt% AgNPs were evaluated for flexural strength, elastic modulus and impact strength. The glass transition temperature (Tg) and relative heat capacity (Cp) of the samples were determined from the Differential Scanning Calorimetry (DSC) results. For statistical analysis, two-way ANOVA and Tukey-HSD tests were performed. Results: . . . Addition of 0.8% and 1.6% AgNPs in microwave-polymerized resin significantly decreased the transverse strength and elastic modulus. In terms of impact strength, the addition of AgNPs has no effect on both resin groups. Glass transition temperature (Tg) was decreased with the addition of AgNPs for both denture base resins. Conclusions: The incorporation of AgNPs, generally used for antimicrobial efficiency, affected the transverse strength of the denture base acrylic resins depending on the concentration of nanoparticles. Tg was decreased with the addition of AgNPs for both denture base resins. © 2016, Faculdade de Odontologia de Bauru. All rights reserved Daha fazlası Daha az

Comparison of the shear bond strengths of ceramic brackets using either a self-etching primer or the conventional method after intracoronal bleaching

Türk, Tamer | Elekdağ-Türk, Selma | Koçak, Mustafa Murat | Koçak, Sibel | Özlü, Fethiye Çakmak

Article | 2015 | Turkish Journal of Orthodontics28 ( 3 ) , pp.77 - 81

Objective: To evaluate the initial shear bond strengths (SBSs) of ceramic brackets using either a self-etching primer (SEP) or the conventional method (CM) after intracoronal bleaching with sodium perborate and distilled water. Methods: Eighty human incisors were divided into four groups according to bleaching and bonding procedures: Group 1, bleaching was not applied and the brackets were bonded with a self-etching primer; Group 2, bleaching was not applied and the brackets were bonded with the conventional method; Group 3, intracoronal bleaching with sodium perborate was applied for three weeks and the brackets were bonded with a . . .self-etching primer; and Group 4, intracoronal bleaching with sodium perborate was applied for three weeks and the brackets were bonded with the conventional method. A self-etching primer (Transbond Plus) was applied as recommended by the manufacturer. After SEP application, the ceramic brackets were bonded with a light-curing adhesive (Transbond XT). For the conventional method, the teeth were etched with 37% phosphoric acid. After etching, a thin uniform coat of primer (Transbond XT Primer) was applied and the ceramic brackets were bonded with a light-curing adhesive (Transbond XT). SBSs were measured after water storage for 30 days, after 1000 cycles of thermocycling between 5°C and 55°C. Bond failure location was determined with the Adhesive Remnant Index (ARI).Results: For the SEP method, there was no significant difference between SBS values of the bleaching and non-bleaching groups. Furthermore, for the conventional method, the SBS value of the non-bleaching group was not significantly different from that of the bleaching group. SBS values of the SEP method presented significant differences from those of the conventional method ( Daha fazlası Daha az

New design for an adjustable cise space maintainer

Özkalaycı, Nurhat | Yetmez, Mehmet

Article | 2018 | BioMed Research International2018 , pp.77 - 81

Objective. The aim of this study is to present a new adjustable Cise space maintainer for preventive orthodontic applications. Methods. Stainless steel based new design consists of six main components. In order to understand the major displacement and stress fields, structural analysis for the design is considered by using finite element method. Results. Similar to major displacement at y-axis, critical stresses ?x and ?xy possess a linear distribution with constant increasing. Additionally, strain energy density (SED) plays an important role to determine critical biting load capacity. Conclusion. Structural analysis shows that the . . .space maintainer is stable and is used for maintaining and/or regaining the space which arouses early loss of molar tooth. © 2018 Nurhat Ozkalayci and Mehmet Yetmez Daha fazlası Daha az

A new appliance for improving the miniscrew stability

Özkalaycı, Nurhat | Yetmez, Mehmet

Article | 2016 | Advances in Materials Science and Engineering2016 , pp.77 - 81

The aim of this study is to present a new appliance called stability leg designed as an additional anchorage providing device for increasing primary stability of orthodontic miniscrew. For this purpose, two finite element models (FEMs) with two different cortical layer thicknesses of 1 mm and 2 mm are considered. In order to achieve the stability analysis, these two main models, namely, Model I and Model II, are divided into subgroups according to stability leg lengths. Two types of forces are considered. (1) First force is a constant force of 1 N which is applied to all two models. (2) Second force is defined in the range of 1-4 N. . . . Each of 1, 2.5, and 4 N of the second force is applied with a position angle ranging from 34° to 44°. Results show that stability of a miniscrew with 5 mm leg increases primary stability of the miniscrew. © 2016 Nurhat Ozkalayci and Mehmet Yetmez Daha fazlası Daha az

Effect of glide path preparation on apical debris extrusion of rotary and reciprocating single-file systems: OneShape versus WaveOne

Aktemur, Sevinç Türker | Koçak, Sibel | Koçak, Mustafa Murat | Sağlam, Baran Can

Article | 2015 | Cumhuriyet Dental Journal18 ( 1 ) , pp.1 - 8

Objectives: To assess the effect of glide path on the amount of apically extruded debris after instrumentation with WaveOne and OneShape. Materials & Methods: Forty-eight extracted human mandibular incisors were assigned to 4 groups. In groups 1 and 2, preparation was completed with WaveOne, in groups 3 and 4 canals were prepared with OneShape. Before instrumentation, in groups 1 and 3, glide path was created with PathFile 1, 2, and 3 at working length, whereas in groups  2 and 4, glide path was not performed. The weight of the extruded debris for each group was calculated by comparing the pre-  . . .;and post-instrumentation weights of the eppendorf tubes. The time required for reaching full WL was also recorded. Data were analysed by Kruskal–Wallis and Mann–Whitney U tests. Results: There was no difference in the amount of debris extruded between the single file systems (P=0.234). Time required to reach full WL was significantly decreased by creating a glide path (P< 0.05). Conclusions: Creation of a glide path does not significantly affect the apically extruded debris. Objectives: To assess the effect of glide path on the amount of apically extruded debris after instrumentation with WaveOne and OneShape. Materials & Methods: Forty-eight extracted human mandibular incisors were assigned to 4 groups. In groups 1 and 2, preparation was completed with WaveOne, in groups 3 and 4 canals were prepared with OneShape. Before instrumentation, in groups 1 and 3, glide path was created with PathFile 1, 2, and 3 at working length, whereas in groups  2 and 4, glide path was not performed. The weight of the extruded debris for each group was calculated by comparing the pre- and post-instrumentation weights of the eppendorf tubes. The time required for reaching full WL was also recorded. Data were analysed by Kruskal–Wallis and Mann–Whitney U tests. Results: There was no difference in the amount of debris extruded between the single file systems (P=0.234). Time required to reach full WL was significantly decreased by creating a glide path (P< 0.05). Conclusions: Creation of a glide path does not significantly affect the apically extruded debris Daha fazlası Daha az

Comparison of low versus full battery/charge conditions of electronic apex locators

Sağlam, Baran Can | Çiçek, Ersan | Koçak, Sibel | Koçak, Mustafa Murat

Article | 2015 | Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi25 ( 2 ) , pp.181 - 184

Amaç: Bu çalışmanın amacı Root ZX mini ve Raypex 6 elektronik apex bulucu cihazların (EAB) düşük ve tam dolu pil/şarj durumlarının kanal boyu ölçümündeki etkinliklerinin karşılaştırılmasıdır. Gereç ve Yöntem: Bu çalışmada kök ucu gelişimi tamamlanmış 27 adet daimi alt çene keser diş kullanıldı. Giriş kaviteleri hazırlandı ve tüm örnekler numaralandırıldı. 10 numara K tipi eğe kök kanalı içerisine ucu apikal foramende görülünceye dek yerleştirildi ve gerçek kök kanal boyu belirlendi. Pil ile çalışan Root ZX mini ve şarj edilebilir özellikte olan Raypex 6 EAB cihazları üretici firma talimatlarına göre kullanıldı. Elektronik çalışma bo . . .yutu tespiti ilk olarak tam dolu ardından da düşük pil/şarj seviyesine sahip Root ZX mini ve Raypex 6 cihazları ile yapıldı. Gruplar arasındaki farklılıkların kıyaslanması Kruskal-Wallis istatistiksel analizi ile yapıldı. Bulgular: Raypex 6 ile yapılan ölçümlerde tam dolu ve düşük şarj seviyeleri arasında istatistiksel olarak anlamlı bir fark bulunmamıştır. Root ZX ve Raypex 6'nın tam dolu pil/şarj seviyeleri arasında anlamlı bir fark bulunmamıştır. Düşük pil seviyesindeki Root ZX mini ile diğer deney grupları arasında ise istatistiksel olarak anlamlı bir fark ortaya çıkmıştır(p< 0.05). Sonuç: Root ZX mini düşük pil seviyesinde farklı ölçümlere yol açmıştır ancak pil ile çalışan ve şarjlı elektronik apeks bulucu cihazları ile elektronik kanal boyu ölçümünde hem düşük hem de tam dolu pil/şarj seviyelerinde ±1 mm tolerans aralığı için kabul edilebilir ölçümler elde edilmiştir Aim: The aim of this in vitro study was to compare the accuracy of Root ZX mini and Raypex 6 electronic apex locators (EAL) in low versus full battery/charge conditions. Material and methods: Twenty-seven extracted human mandibular incisor teeth with mature apices were used in this study. Access cavities were prepared and all specimens were numbered. #10 K file was introduced into the root canal until its tip was visualized at the apical foramen and the actual working length (AWL) was determined..The EALs; battery-powered Root ZX mini (J. Morita Corp, Tokyo, Japan) and rechargeble Raypex 6 (VDW, Munich, Germany) manufacturers’ instructions. The electronic working length (EWL) measurement differences with Root ZX mini and Raypex 6 in low and full battery/chargeconditions were compared among the groups. Statistical analyses were performed by the Kruskal–Wallis test.Results: No significant difference was observed between low and full charge condition of Raypex 6 groups. Although there was no significant difference between Root ZX with full battery and Raypex 6 with full charge conditions, contrary root ZX mini with low battery showed significant differences in comparison with the other groups (p< 0.05).Conclusion: Although the low battery condition of the EAL may cause deviations in measurements, the accuracy of the both battery powered and charged EALs presents acceptable results in low and full battery/charge conditions within the ±1 mm tolerance range. Nevertheless the low battery condition of the EAL may cause deviations in measurement Daha fazlası Daha az

Silver nanoparticle incorporation effect on mechanical and ther at properties of denture base acrylic resins

Köroğlu, Ayşegül | Şahin, Onur | Kürkçüoğlu, Işın | Dede, Doğu Ömür | Özdemir, Tonguc | Hazer, Baki

Article | 2016 | JOURNAL OF APPLIED ORAL SCIENCE24 ( 6 ) , pp.590 - 596

Objective: The aim of the present study was to evaluate the mechanical and thermal characteristics of two denture base acrylic resins containing silver nanoparticles (AgNPs). Material and Methods: Two different acrylic denture base resins (heat-polymerized and microwave polymerized) containing 0.3, 0.8 and 1.6 wt% AgNPs were evaluated for flexural strength, elastic modulus and impact strength. The glass transition temperature (Tg) and relative heat capacity (Cp) of the samples were determined from the Differential Scanning Calorimetry (DSC) results. For statistical analysis, two-way ANOVA and Tukey-HSD tests were performed. Results: . . . Addition of 0.8% and 1.6% AgNPs in microwave polymerized resin significantly decreased the transverse strength and elastic modulus. In terms of impact strength, the addition of AgNPs has no effect on both resin groups. Glass transition temperature (Tg) was decreased with the addition of AgNPs for both denture base resins. Conclusions: The incorporation of AgNPs, generally used for antimicrobial efficiency, affected the transverse strength of the denture base acrylic resins depending on the concentration of nanoparticles. Tg was decreased with the addition of AgNPs for both denture base resins Daha fazlası Daha az

Evaluation of the use of mineral trioxide aggregate and light curing glass ionomer cement in coronal bleaching

Koçak, Mustafa Murat | Koçak, Sibel | Oktay, Elif Aybala | Aktuna, Serkan | Yaman, Sis Darendeliler

Other | 2010 | Gülhane Tıp Dergisi52 ( 2 ) , pp.96 - 99

Bu çalışmanın amacı farklı kalınlıklarda yerleştirilen beyaz mineral trioksit agregat, mineral trioksit agregat, gri mineral trioksit agregat ve ışıkla sertleşen cam iyonomer simanın devital ağartma işlemlerinde bariyer maddesi olarak kullanımlarının etkinliğinin değerlendirilmesidir. Çalışmada 130 adet yeni çekilmiş, çürüksüz, daimi tek köklü insan üst çene kanin dişi kullanıldı. Dişler rastgele altı gruba ve pozitif ile negatif kontrol gruplarına ayrıldı. Deney grupları 1, 2 ve 3'deki örneklere sırasıyla 2 mm kalınlıkta beyaz mineral trioksit agregat, gri mineral trioksit agregat ve ışıkla sertleşen cam iyonomer siman yerleştirild . . .i. Deney grupları 4, 5 ve 6'daki örneklere sırasıyla 5 mm kalınlıkta beyaz mineral trioksit agregat, gri mineral trioksit agregat ve ışıkla sertleşen cam iyonomer siman yerleştirildi. Pozitif kontrol grubundaki örneklere bariyer yerleştirilmedi ve negatif kontrol grubundaki örneklere ağartma işlemi uygulanmadı. Beyaz ve gri mineral trioksit agregatlar arasında sızıntı miktarı açısından farklılık bulunmadı (p>0.001). Sonuç olarak hem gri hem de beyaz mineral trioksit agregat iyi koronal kaplama sağlayıp, koronal sızıntı miktarını azaltmıştır. The aim of this study was to compare the effectiveness of white mineral trioxide aggregate and gray mineral trioxide aggregate with different thicknesses and light curing glass ionomer cement when used as a barrier material in intracoronal bleaching procedures. In this study, 130 freshly extracted, caries free human permanent single rooted maxillary canine teeth were used. The teeth were randomly divided into six experimental groups, and positive and negative control groups. The specimens in the experimental groups 1, 2 and 3 received white mineral trioxide aggregate, gray mineral trioxide aggregate and light curing glass ionomer cement with a thickness of 2 mm, respectively. The specimens in the experimental groups 4, 5 and 6 received white mineral trioxide aggregate, gray mineral trioxide aggregate and light curing glass ionomer cement with a thickness of 5 mm, respectively. The positive control group received no barrier material and the negative control group did not undergo bleaching. There was no difference in leakage between gray mineral trioxide aggregate and white mineral trioxide aggregate (p>0.001). In conclusion, both gray and white mineral trioxide aggregate provided good coronal seal and decreased the amount of coronal leakage Daha fazlası Daha az

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