esra kul - Academia.edu (original) (raw)
Papers by esra kul
Materiale Plastice, 2021
Although polymethylmethacrylate (PMMA) is widely used as a denture base material, its disadvantag... more Although polymethylmethacrylate (PMMA) is widely used as a denture base material, its disadvantages include low strength and low thermal conductivity. The effects on thermal conductivity, flexural strength, thermal diffusivity, and elastic modulus of adding Al2O3 and SiC powders in different volumes to PMMA were investigated. A total of 60 specimens were prepared in 10 groups (five groups for the thermal conductivity test and five groups for the flexural strength test (n:6). The specimens were immersed in water for 30 days before the testing. Thermal conductivity values were measured by the transient hot bridge (THB) method, and flexural strengths were measured by the 3-point bend test. A significant difference was found in thermal conductivity, flexural strength, thermal diffusivity and elastic modulus values between independent groups (P [0.001) using the Kruskal-Wallis test. The Kruskal Wallis 1-way ANOVA was used for the post hoc tests after Kruskal Wallis (a;=.05). The thermal ...
Materiale Plastice
How the particle size and volumetric ratio of silicon carbide (SiC) powder additions will strengt... more How the particle size and volumetric ratio of silicon carbide (SiC) powder additions will strengthen polymethyl methacrylate (PMMA) is unclear. The purpose of this in vitro study was to optimize the reinforcement parameters of PMMA with SiC powder by using the Taguchi experimental design method. Particle size, volumetric rate, silane coupling rate, and mixing type were determined as parameters that would affect the reinforcement of PMMA with SiC powder. Using the Taguchi L9 orthogonal array, test specimens with different parameter combinations were fabricated and tested. The fracture load (in newtons) of each specimen group was recorded with the 3-point bend test. The thermal conductivity values of 60x50-mm and 3-mm-thick rectangular specimens were measured by using the Linseis THB100 thermal conductivity unit. The thermal diffusivity values were then calculated. Thermal analysis indicated improvement in the thermal conductivity of PMMA after reinforcement with SiC. The maximum ther...
Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi
Aim: This study aims to evaluate the bond strength of SARC to the root canal dentin through the u... more Aim: This study aims to evaluate the bond strength of SARC to the root canal dentin through the use of ultrasonic and sonic activation. Material and Methods: Thirty-six mandibular premolar teeth were used. After preparation-irrigationobturation procedures post space preparation was completed with the drill incident to post system used. Specimens were divided randomly into three groups according to resin cement activation (n=12): No activation (Control), Ultrasonic activation (UA), Sonic activation (SA). Fiber posts were seated and resin cement polymerized. Six slices, 1-mm thick, were obtained from each specimen. A push-out test was performed to slices two, four, and six. Data were analyzed statistically with Kruskal-Wallis and Mann-Whitney U tests. Results: A significant difference was found between activation methods (p<0.05). The control group showed significantly better bond strength values than the ultrasonic and sonic activation groups. Root regions had no significant effect on bond strength (p>0.05). Conclusion: Both ultrasonic and sonic activation of SARC could have negative effects on the bond strength.
Dental Research Journal, 2021
Background: The aim of this study was to investigate whether boron nitride (BN) and BN–chromium (... more Background: The aim of this study was to investigate whether boron nitride (BN) and BN–chromium (BN–Cr) coatings applied with the sputtering method would change the characteristics of hardness and discoloration of the ceramic veneer surface. Materials and Methods: In this experimental study, thirty disc-shaped cores (10 mm in diameter and 0.8 mm in thickness) were prepared. Three different ceramic systems, IPS Empress (E) (Ivoclar Vivadent, Schaan, Liechntenstein), IPS e.max Press (EP) (Ivoclar Vivadent, Schaan, Liechntenstein), and Turkom Cera (T) (Turcom-Ceramic SDN-BHD, Kuala Lumpur, Malaysia), were tested, each with n = 10. The specimens were divided into two subgroups (n = 5) according to the coating on the veneering ceramic: BN or BN–Cr. The Vickers hardness and color differences (ΔE) values were measured before and after coating. Surface analysis was performed with X-ray diffraction, X-ray photoelectron spectroscopy, and scanning electron microscopic. The Wilcoxon signed-rank...
Journal of Prosthodontics
oral health and dental management, 2016
Aims: The aim of this in vitro study was to assess the shear bond strengths of hydrophobic and hy... more Aims: The aim of this in vitro study was to assess the shear bond strengths of hydrophobic and hydrophilic resin cements to dentin, after application of ethyl-alcohol-wet and water-wet bonding techniques. Materials and Methods: Seventy flat dentin surfaces were etched, rinsed, blot-dried, and kept moist before applying the water-wet bonding technique. In addition to these procedures, the surfaces were re-wetted with 100% ethanol solution for 30 seconds for the application of the ethanol-wet bonding technique. They were then bonded with adhesives. After construction of resin composite build-ups with resin cements, the specimens were held in water for 1 day. An Instron device was used to measure bond strength and environmental scanning electron microscopy (ESEM) was used to evaluate dentin surfaces treated with adhesive. Analysis of variance (ANOVA) and the three factor with interaction model were used for statistical analysis. Results: The mean bonding values of the experimental grou...
Objectives: This study was done with the objective of determining the distance of movement betwee... more Objectives: This study was done with the objective of determining the distance of movement between the maxillary and mandibular midline (DMM) and its relationship with the signs and symptoms of temporomandibular disorders (TMD) in canine-guided occlusion and to compare the obtained values between the right and left sides. Materials and Methods: One hundred females showing canine-guided occlusion and Angle's class I canine and molar relation were chosen for the study. The maxillary midline’s corresponding line was marked on the mandible with a marker pen in the patient's mouth, both during maximum intercuspation and at the edges of maxillary and mandibular canine contact. DMM was considered as the distance between the two lines (measured using a digital caliper). The percentages of signs and symptoms were compared using the chi-square test to determine the differences among the groups for the rates of TMD symptoms, bruxism, joint sounds and unilateral chewing. Results: The me...
How the particle size and volumetric ratio of silicon carbide (SiC) powder additions will strengt... more How the particle size and volumetric ratio of silicon carbide (SiC) powder additions will strengthen polymethyl methacrylate (PMMA) is unclear. The purpose of this in vitro study was to optimize the reinforcement parameters of PMMA with SiC powder by using the Taguchi experimental design method. Particle size, volumetric rate, silane coupling rate, and mixing type were determined as parameters that would affect the reinforcement of PMMA with SiC powder. Using the Taguchi L9 orthogonal array, test specimens with different parameter combinations were fabricated and tested. The fracture load (in newtons) of each specimen group was recorded with the 3-point bend test. The thermal conductivity values of 6050-mm and 3-mm-thick rectangular specimens were measured by using the Linseis THB100 thermal conductivity unit. The thermal diffusivity values were then calculated. Thermal analysis indicated improvement in the thermal conductivity of PMMA after reinforcement with SiC. The maximum ther...
Objective: The most common cause of clinical failures in all-ceramic dental restorations is crac... more Objective: The most common cause of clinical failures in all-ceramic dental restorations is crack formation in the veneering ceramic. The aim of this study was to determine whether graphene doping would change the characteristics of hardness and discoloration of the ceramic veneer surface. Material-Method: Thirty disk-shaped cores (10 mm in diameter and 0.8 mm in thickness) were prepared. Three different ceramic systems, IPS Empress (E) (Ivoclar Vivadent, Schaan, Liechtenstein), IPS e.max Press (EP) ( Ivoclar Vivadent, Schaan, Liechtenstein), and Turkom Cera (TC) (Turcom-Ceramic SDN-BHD, Kuala Lumpur, Malaysia) were tested, each with n=8. The Vickers hardness and color difference (ΔE) values were measured before and after doping with graphene. Surface analysis was performed with XRD, XPS, and SEM. The Wilcoxon signed-rank test was performed to compare hardness values. The Kruskal-Wallis test was performed to compare ∆E values among all groups. The Kruskal-Wallis one-way ANOVA was...
Dental and Medical Problems
BACKGROUND If a temporary restoration is in the esthetic area and needs to be worn for a long tim... more BACKGROUND If a temporary restoration is in the esthetic area and needs to be worn for a long time, the color stability of temporary materials becomes an important factor. OBJECTIVES The aim of this in vitro study was to evaluate the long-term effects of various staining solutions on the color stability of different temporary materials produced with the computer-aided design and computer-aided manufacturing (CAD/CAM) technology. MATERIAL AND METHODS In the study, the following materials were used: VITA CAD-Temp® (group 1); Ceramill® Temp (group 2); and Telio® CAD (group 3). Forty disk-shaped specimens (10 mm in diameter, 2 mm in thickness) of each material (N = 120) were produced with a CAD/CAM system. Staining solutions - of tea (A), of coffee (B) and cola (C) - and distilled water (D, control) were used, and color was evaluated before and after storing the samples in the solutions. Measurements were taken with a spectrophotometer and the color parameters (L*, a*, b*, and ΔE) were calculated according to the Commission internationale de l'éclairage system (CIELab). The results were evaluated with the two-way analysis of variance (ANOVA) and Tukey's tests (α = 0.05). RESULTS Clinically perceivable (ΔE00 > 0.8) and statistically significant (p < 0.001) color differences were detected in all specimens. The highest ΔE00 value was found in the Ceramill Temp specimens. In addition, the highest ΔE00 values were noted for the specimens stored in cola and the coffee solution for all groups. The lowest ΔE00 value was observed for the groups stored in the tea solution. CONCLUSIONS Clinically perceivable color changes were observed in all the specimens kept in the solutions. Color changes were greater for cola and coffee as compared to tea.
The Journal of Prosthetic Dentistry
Materials
Glass ionomer cement (GIC) is a well-known restorative material applied in dentistry. The present... more Glass ionomer cement (GIC) is a well-known restorative material applied in dentistry. The present work aims to study the effect of hydroxyapatite (HA) addition into GIC based on physical, mechanical and structural properties. The utilization of waste materials namely clam shell (CS) and soda lime silica (SLS) glass as replacements for the respective CaO and SiO2 sources in the fabrication of alumino-silicate-fluoride (ASF) glass ceramics powder. GIC was formulated based on ASF glass ceramics, polyacrylic acid (PAA) and deionized water, while 1 wt.% of HA powder was added to enhance the properties of the cement samples. The cement samples were subjected to four different ageing times before being analyzed. In this study, the addition of HA caused an increment in density and compressive strength results along with ageing time. Besides, X-ray Diffraction (XRD) revealed the formation of fluorohydroxyapatite (FHA) phase in HA-added GIC samples and it was confirmed by Fourier Transform In...
Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi, Apr 15, 2020
Aim: The purpose of this in vitro study was to determine how pretreatment with desensitizers affe... more Aim: The purpose of this in vitro study was to determine how pretreatment with desensitizers affects micro-tensile bond strength between dentin and self-etch resin cement (SEC). Material and Methods: The occlusal surfaces of extracted teeth were abraded with a diamond bur to the dentin layer and divided into 5 equal groups (n = 20); G1-control (no desensitizer, only Clearfil aesthetic resin cement (CEC); G2-Gluma and CEC; G3-Bi-fluorid 12 and CEC; G4-FGM desensitizer and CEC; G5-D/Sense Crystal and CEC. Resin cement layers were added to a depth of 8 mm in the control group, and desensitizer was applied to the surfaces before resin cement application in the other experimental groups. A specimen from each group was examined with scanning electron microscopy. The specimens were sectioned to be 1 mm 2 perpendicular to the adhesive layer, and the microtensile test was applied. According to the results of the post hoc Tamhane test, there was a significant difference. (p<0.05). Results: Only the Gluma desensitizer had a significantly lower bond strength value when compared with the other desensitizers and the control group. Conclusions: While dentin with oxalate, fluoride, and strontium chloride-potassium nitrate contamination did not affect the bonding strength of SEC, dentin contamination with glutaraldehyde/HEMA had a negative effect. Keywords. Desensitizer; self-etch resin cement; microtensile bond strength. ÖZ Amaç: Bu in vitro çalışmanın amacı, dentine hassasiyet giderici ajan uygulamasının, self-etch rezin simanın (SEC) mikrogerilim bağlanma dayanımını nasıl etkilediğini araştırmaktır. Gereç ve Yöntem: Çekilmiş dişlerin oklüzal yüzleri elmas frez ile dentin tabakasına kadar aşındırıldı ve 5 eşit gruba ayrıldı (n = 20); G1-kontrol (hassasiyet giderici ajan kullanılmadı, sadece Clearfil estetik rezin siman (CEC); G2-Gluma ve CEC; G3-Bi-fluorid 12 ve CEC; G4-FGM ve CEC; G5-D/Sense Crystal ve CEC. Kontrol grubunda, dentin üzerine 8 mm yüksekliğinde rezin siman tabakası eklendi ve diğer deney gruplarına rezin simandan önce dentin hassasiyet giderici ajanlar uygulandı. Her gruptan bir örnek taramalı elektron mikroskobu ile incelendi. Örnekler dentin-siman bağlantısına dik olarak 1 mm 2 olacak şekilde kesildi ve mikrogerilim bağlanma dayanımı ölçüldü. Post-hoc Tamhane testinin sonuçlarına göre anlamlı bir fark vardı (p <0.05). Bulgular: Dentin hassasiyet giderici ajanlar arasında sadece Gluma, diğer gruplar ve kontrol grubu ile karşılaştırıldığında anlamlı şekilde daha düşük bir bağlanma dayanımına sahipti. Sonuç: Dentin üzerine oksalat, florür ve stronsiyum klorür-potasyum nitrat uygulaması, SEC ile arasındaki bağlanma dayanımını etkilemese de, glutaraldehit/HEMA uygulaması olumsuz etkilemiştir. Anahtar kelimeler: Hassasiyet giderici ajan; Self-etch rezin siman; Mikrogerilim bağlanma testi
Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi, Jan 15, 2020
Aim: This study aims to evaluate the bond strength of SARC to the root canal dentin through the u... more Aim: This study aims to evaluate the bond strength of SARC to the root canal dentin through the use of ultrasonic and sonic activation. Material and Methods: Thirty-six mandibular premolar teeth were used. After preparation-irrigationobturation procedures post space preparation was completed with the drill incident to post system used. Specimens were divided randomly into three groups according to resin cement activation (n=12): No activation (Control), Ultrasonic activation (UA), Sonic activation (SA). Fiber posts were seated and resin cement polymerized. Six slices, 1-mm thick, were obtained from each specimen. A push-out test was performed to slices two, four, and six. Data were analyzed statistically with Kruskal-Wallis and Mann-Whitney U tests. Results: A significant difference was found between activation methods (p<0.05). The control group showed significantly better bond strength values than the ultrasonic and sonic activation groups. Root regions had no significant effect on bond strength (p>0.05). Conclusion: Both ultrasonic and sonic activation of SARC could have negative effects on the bond strength.
Journal of Spectroscopy
The alumino-silicate-fluoride (ASF) bioglass system with empirical formula [(45-x)SiO2-xCaF2-20P2... more The alumino-silicate-fluoride (ASF) bioglass system with empirical formula [(45-x)SiO2-xCaF2-20P2O5-20Al2O3-15CaO] where x = 5, 10, 15, and 20 (wt.%) has been synthesised by using conventional melt-quenching method. In this study, soda lime silica (SLS) glass and clam shell (CS) vitreous waste were utilized as a source of silicon dioxide (SiO2) and calcium oxide (CaO), respectively. The different physical behaviors of ASF bioglass were closely related to the CaF2 content in each composition. The structural analysis shows the presence of various chemical bonds showing the formation of ASF bioglass. The ASF bioglass has many applications in dental field and efforts to improve its formulation can promise a better future in medical procedures.
Journal of Materials Research and Technology
Abstract Glass Ionomer Cement (GIC) is produced from an acid-base reaction between various type o... more Abstract Glass Ionomer Cement (GIC) is produced from an acid-base reaction between various type of alkaline glass powder and polymeric acid. In this research, calcium fluoro-alumino-silicate (CFAS) glass was derived from waste materials such as soda-lime-silica (SLS) glass and clam shell (CS) which are sources of silica and calcium oxide respectively. The polyacrylic acid (PAA) is used to produced mobile carboxyl group and then, react with metal ions on the surface of CFAS glass. To study the influence of ageing time on physical, structural and mechanical properties of GIC, deionized water was used as a soaking medium. The density results increase throughout the ageing time from 7–28 days. The density of GIC at 7 days shows 1.622 g/cm3 and increasing to 1.789 g/cm3 at 28 days. However, the molar volume shows the opposite action comparing with the density of GIC. The molar volume shows continue decreasing from 357.63–324.25 cm3 mol−1. From the XRD result, GIC was indicating amorphous structure during ageing range between 7–28 days. FTIR analysis shows this phenomenon occurs due to the deformation of Si−OH bonding and formation of Si-O-Si simultaneously in the presence of water which is influence the mechanical strength of GIC. The mechanical properties of GIC increase by ageing time through the compressive test from 42.23–50.28 MPa. Thus, the observed results in this study promise the GIC derived from waste materials have a high potential in dental application due to excellence structural and mechanical properties against ageing.
Biomedical Journal of Scientific & Technical Research
Material and Methods: Mandibular premolars with single oval canal were collected for the study. R... more Material and Methods: Mandibular premolars with single oval canal were collected for the study. Root canals were prepared with Reciproc R25 and were randomly divided into six groups (n=10), as follows: group 1, additional instrumentation with SAF and filling using 2Seal and gutta-percha (GP); group 2, additional instrumentation with SAF and filling using Total Fill BC and GP; group 3, additional instrumentation with XP and filling using 2Seal and gutta-percha; group 4, additional instrumentation with XP and filling using TotalFill BC and GP; group 5, canal filling with 2seal and GP without additional instrumentation; group 6, canal filling with Total Fill BC and GP without additional instrumentation. Each sample was sectioned horizontally into 1 mm thick slices at each thirds and push-out test was performed using universal testing machine. Three-way ANOVA and Tukey’s post-hoc tests were performed to compare groups.
The Journal of Prosthetic Dentistry
STATEMENT OF PROBLEM Which type of post improves the performance of endodontically treated mandib... more STATEMENT OF PROBLEM Which type of post improves the performance of endodontically treated mandibular premolars without a ferrule remains unclear. PURPOSE The purpose of this in vitro study was to compare the restoration of endodontically treated mandibular premolars without a ferrule by using different post systems. MATERIAL AND METHODS Thirty extracted mandibular premolars were endodontically treated, and their crowns removed. They were divided into 3 groups with different post systems (n=10): zirconia ceramic posts (ZRPs), fiber posts (FPs), and bundled glass fiber-reinforced composite resin posts (GTPs). After post placement and core fabrication, computer-aided design and computer-aided manufacture (CAD-CAM) lithium disilicate crowns were cemented. The specimens were subjected to thermocycling and mastication simulation before a fracture test in a universal testing machine. The maximum load at which the fracture occurred was recorded, and the fractured specimens were examined by using an optical microscope. The data were analyzed for statistical differences with a 1-way ANOVA and the Tukey honestly significant difference post hoc test (α=.05). RESULTS No statistically significant difference in fracture strength was found among the groups (P=.970). From the light microscopy examination, catastrophic failure was observed in all specimens, and there was no failure of the ceramic crowns. CONCLUSIONS Based on the findings of this in vitro study, the choice of post material with a low or high modulus of elasticity did not prevent catastrophic failures in endodontically treated teeth without a ferrule.
Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi
İş güvenliği ve çalışanların sağlığına yönelik olarak koruyucu ve önleyici faaliyetlerin geliştir... more İş güvenliği ve çalışanların sağlığına yönelik olarak koruyucu ve önleyici faaliyetlerin geliştirilmesi ve uygulanması çalışmalarını yönlendirmek, bu çalışma ve uygulamaların yasalara uygun olarak yürütülmesini sağlamak işverenin görevleri arasındadır. Bu çalışmanın amacı, yapılan dört yıllık kültür verilerinin karşılaştırılarak fakültemiz sağlık çalışanlarının ortak kullanım alanlarının mikrobiyolojik değerlendirmelerinin güvenli ortam sağlanmasına yönelik tedbirlerin alınmasına katkı sağlamasıdır. Materyal ve metod: Örnekler fakültemizde sıklıkla kullanılan alanlardan her yıl tekrarlanmak üzere 4 (dört) yıl (2014, 2015, 2016, 2017), steril distile su ile nemlendirilmiş eküvyonlar ile sürüntü alma yöntemi uygulanarak alınmıştır. Alınan örnekler araştırma hastanesi mikrobiyoloji laboratuarında %5 koyun kanlı agar ve Eozin metilen Blue (EMB) agar besiyerlerine ekim yapılarak etüvde 48 saat 37 o C'de bekletilmiştir. Gün içerisinde alındıkları zamana bağlı olarak üreyen aerob mikroorganizmaların tipleri belirlenmiştir. Bulgular: İlk yılda (2014) yapılan taramalarda dikkat çeken durum, bakteriyal kirlenmenin hatta bazı alanlarda tehlikeli kolonizasyonların olmasıdır. 2015 yılı incelemelerinde fekal oral kirlenmenin olduğu enterik bakteri kolonizasyonları gözlenmesine rağmen tehlikeli kolonizasyonlar gözlenmemiştir. Son iki yıl ise çoğunluk bize cilt florası tespitinin olduğunu göstermektedir. En fazla kontamine olan yerler, telefon, bilgisayar, ünit kreşuarı, pencere, kapı kolları ve hava su spreyi olarak belirlenmiştir. Sonuç: Diş hekimliği ortak çalışma alanında çapraz enfeksiyon kontrolü sağlamada hedef; bireyler veya birey ile yüzeyler arasında geçiş yapabilecek mikroorganizma sayısını azaltmak olmalıdır. Bu amaca yönelik olarak uyulması gereken genel prensiplere dayanarak, ortam bakteri florasının bilinerek, çalışanlarda hijyen duyarlılığını artırmak, güvenli ve sağlıklı çalışma ortamı kazanmada etkili olacaktır. Fakültemizde ilk yıl yapılan çalışma ile alınan tedbirler sonucunda, son yıl görülen ortam mikrobiyolojik çalışması bize bunun sağlanmasının zor olmadığını göstermiştir.
Materiale Plastice, 2021
Although polymethylmethacrylate (PMMA) is widely used as a denture base material, its disadvantag... more Although polymethylmethacrylate (PMMA) is widely used as a denture base material, its disadvantages include low strength and low thermal conductivity. The effects on thermal conductivity, flexural strength, thermal diffusivity, and elastic modulus of adding Al2O3 and SiC powders in different volumes to PMMA were investigated. A total of 60 specimens were prepared in 10 groups (five groups for the thermal conductivity test and five groups for the flexural strength test (n:6). The specimens were immersed in water for 30 days before the testing. Thermal conductivity values were measured by the transient hot bridge (THB) method, and flexural strengths were measured by the 3-point bend test. A significant difference was found in thermal conductivity, flexural strength, thermal diffusivity and elastic modulus values between independent groups (P [0.001) using the Kruskal-Wallis test. The Kruskal Wallis 1-way ANOVA was used for the post hoc tests after Kruskal Wallis (a;=.05). The thermal ...
Materiale Plastice
How the particle size and volumetric ratio of silicon carbide (SiC) powder additions will strengt... more How the particle size and volumetric ratio of silicon carbide (SiC) powder additions will strengthen polymethyl methacrylate (PMMA) is unclear. The purpose of this in vitro study was to optimize the reinforcement parameters of PMMA with SiC powder by using the Taguchi experimental design method. Particle size, volumetric rate, silane coupling rate, and mixing type were determined as parameters that would affect the reinforcement of PMMA with SiC powder. Using the Taguchi L9 orthogonal array, test specimens with different parameter combinations were fabricated and tested. The fracture load (in newtons) of each specimen group was recorded with the 3-point bend test. The thermal conductivity values of 60x50-mm and 3-mm-thick rectangular specimens were measured by using the Linseis THB100 thermal conductivity unit. The thermal diffusivity values were then calculated. Thermal analysis indicated improvement in the thermal conductivity of PMMA after reinforcement with SiC. The maximum ther...
Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi
Aim: This study aims to evaluate the bond strength of SARC to the root canal dentin through the u... more Aim: This study aims to evaluate the bond strength of SARC to the root canal dentin through the use of ultrasonic and sonic activation. Material and Methods: Thirty-six mandibular premolar teeth were used. After preparation-irrigationobturation procedures post space preparation was completed with the drill incident to post system used. Specimens were divided randomly into three groups according to resin cement activation (n=12): No activation (Control), Ultrasonic activation (UA), Sonic activation (SA). Fiber posts were seated and resin cement polymerized. Six slices, 1-mm thick, were obtained from each specimen. A push-out test was performed to slices two, four, and six. Data were analyzed statistically with Kruskal-Wallis and Mann-Whitney U tests. Results: A significant difference was found between activation methods (p<0.05). The control group showed significantly better bond strength values than the ultrasonic and sonic activation groups. Root regions had no significant effect on bond strength (p>0.05). Conclusion: Both ultrasonic and sonic activation of SARC could have negative effects on the bond strength.
Dental Research Journal, 2021
Background: The aim of this study was to investigate whether boron nitride (BN) and BN–chromium (... more Background: The aim of this study was to investigate whether boron nitride (BN) and BN–chromium (BN–Cr) coatings applied with the sputtering method would change the characteristics of hardness and discoloration of the ceramic veneer surface. Materials and Methods: In this experimental study, thirty disc-shaped cores (10 mm in diameter and 0.8 mm in thickness) were prepared. Three different ceramic systems, IPS Empress (E) (Ivoclar Vivadent, Schaan, Liechntenstein), IPS e.max Press (EP) (Ivoclar Vivadent, Schaan, Liechntenstein), and Turkom Cera (T) (Turcom-Ceramic SDN-BHD, Kuala Lumpur, Malaysia), were tested, each with n = 10. The specimens were divided into two subgroups (n = 5) according to the coating on the veneering ceramic: BN or BN–Cr. The Vickers hardness and color differences (ΔE) values were measured before and after coating. Surface analysis was performed with X-ray diffraction, X-ray photoelectron spectroscopy, and scanning electron microscopic. The Wilcoxon signed-rank...
Journal of Prosthodontics
oral health and dental management, 2016
Aims: The aim of this in vitro study was to assess the shear bond strengths of hydrophobic and hy... more Aims: The aim of this in vitro study was to assess the shear bond strengths of hydrophobic and hydrophilic resin cements to dentin, after application of ethyl-alcohol-wet and water-wet bonding techniques. Materials and Methods: Seventy flat dentin surfaces were etched, rinsed, blot-dried, and kept moist before applying the water-wet bonding technique. In addition to these procedures, the surfaces were re-wetted with 100% ethanol solution for 30 seconds for the application of the ethanol-wet bonding technique. They were then bonded with adhesives. After construction of resin composite build-ups with resin cements, the specimens were held in water for 1 day. An Instron device was used to measure bond strength and environmental scanning electron microscopy (ESEM) was used to evaluate dentin surfaces treated with adhesive. Analysis of variance (ANOVA) and the three factor with interaction model were used for statistical analysis. Results: The mean bonding values of the experimental grou...
Objectives: This study was done with the objective of determining the distance of movement betwee... more Objectives: This study was done with the objective of determining the distance of movement between the maxillary and mandibular midline (DMM) and its relationship with the signs and symptoms of temporomandibular disorders (TMD) in canine-guided occlusion and to compare the obtained values between the right and left sides. Materials and Methods: One hundred females showing canine-guided occlusion and Angle's class I canine and molar relation were chosen for the study. The maxillary midline’s corresponding line was marked on the mandible with a marker pen in the patient's mouth, both during maximum intercuspation and at the edges of maxillary and mandibular canine contact. DMM was considered as the distance between the two lines (measured using a digital caliper). The percentages of signs and symptoms were compared using the chi-square test to determine the differences among the groups for the rates of TMD symptoms, bruxism, joint sounds and unilateral chewing. Results: The me...
How the particle size and volumetric ratio of silicon carbide (SiC) powder additions will strengt... more How the particle size and volumetric ratio of silicon carbide (SiC) powder additions will strengthen polymethyl methacrylate (PMMA) is unclear. The purpose of this in vitro study was to optimize the reinforcement parameters of PMMA with SiC powder by using the Taguchi experimental design method. Particle size, volumetric rate, silane coupling rate, and mixing type were determined as parameters that would affect the reinforcement of PMMA with SiC powder. Using the Taguchi L9 orthogonal array, test specimens with different parameter combinations were fabricated and tested. The fracture load (in newtons) of each specimen group was recorded with the 3-point bend test. The thermal conductivity values of 6050-mm and 3-mm-thick rectangular specimens were measured by using the Linseis THB100 thermal conductivity unit. The thermal diffusivity values were then calculated. Thermal analysis indicated improvement in the thermal conductivity of PMMA after reinforcement with SiC. The maximum ther...
Objective: The most common cause of clinical failures in all-ceramic dental restorations is crac... more Objective: The most common cause of clinical failures in all-ceramic dental restorations is crack formation in the veneering ceramic. The aim of this study was to determine whether graphene doping would change the characteristics of hardness and discoloration of the ceramic veneer surface. Material-Method: Thirty disk-shaped cores (10 mm in diameter and 0.8 mm in thickness) were prepared. Three different ceramic systems, IPS Empress (E) (Ivoclar Vivadent, Schaan, Liechtenstein), IPS e.max Press (EP) ( Ivoclar Vivadent, Schaan, Liechtenstein), and Turkom Cera (TC) (Turcom-Ceramic SDN-BHD, Kuala Lumpur, Malaysia) were tested, each with n=8. The Vickers hardness and color difference (ΔE) values were measured before and after doping with graphene. Surface analysis was performed with XRD, XPS, and SEM. The Wilcoxon signed-rank test was performed to compare hardness values. The Kruskal-Wallis test was performed to compare ∆E values among all groups. The Kruskal-Wallis one-way ANOVA was...
Dental and Medical Problems
BACKGROUND If a temporary restoration is in the esthetic area and needs to be worn for a long tim... more BACKGROUND If a temporary restoration is in the esthetic area and needs to be worn for a long time, the color stability of temporary materials becomes an important factor. OBJECTIVES The aim of this in vitro study was to evaluate the long-term effects of various staining solutions on the color stability of different temporary materials produced with the computer-aided design and computer-aided manufacturing (CAD/CAM) technology. MATERIAL AND METHODS In the study, the following materials were used: VITA CAD-Temp® (group 1); Ceramill® Temp (group 2); and Telio® CAD (group 3). Forty disk-shaped specimens (10 mm in diameter, 2 mm in thickness) of each material (N = 120) were produced with a CAD/CAM system. Staining solutions - of tea (A), of coffee (B) and cola (C) - and distilled water (D, control) were used, and color was evaluated before and after storing the samples in the solutions. Measurements were taken with a spectrophotometer and the color parameters (L*, a*, b*, and ΔE) were calculated according to the Commission internationale de l'éclairage system (CIELab). The results were evaluated with the two-way analysis of variance (ANOVA) and Tukey's tests (α = 0.05). RESULTS Clinically perceivable (ΔE00 > 0.8) and statistically significant (p < 0.001) color differences were detected in all specimens. The highest ΔE00 value was found in the Ceramill Temp specimens. In addition, the highest ΔE00 values were noted for the specimens stored in cola and the coffee solution for all groups. The lowest ΔE00 value was observed for the groups stored in the tea solution. CONCLUSIONS Clinically perceivable color changes were observed in all the specimens kept in the solutions. Color changes were greater for cola and coffee as compared to tea.
The Journal of Prosthetic Dentistry
Materials
Glass ionomer cement (GIC) is a well-known restorative material applied in dentistry. The present... more Glass ionomer cement (GIC) is a well-known restorative material applied in dentistry. The present work aims to study the effect of hydroxyapatite (HA) addition into GIC based on physical, mechanical and structural properties. The utilization of waste materials namely clam shell (CS) and soda lime silica (SLS) glass as replacements for the respective CaO and SiO2 sources in the fabrication of alumino-silicate-fluoride (ASF) glass ceramics powder. GIC was formulated based on ASF glass ceramics, polyacrylic acid (PAA) and deionized water, while 1 wt.% of HA powder was added to enhance the properties of the cement samples. The cement samples were subjected to four different ageing times before being analyzed. In this study, the addition of HA caused an increment in density and compressive strength results along with ageing time. Besides, X-ray Diffraction (XRD) revealed the formation of fluorohydroxyapatite (FHA) phase in HA-added GIC samples and it was confirmed by Fourier Transform In...
Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi, Apr 15, 2020
Aim: The purpose of this in vitro study was to determine how pretreatment with desensitizers affe... more Aim: The purpose of this in vitro study was to determine how pretreatment with desensitizers affects micro-tensile bond strength between dentin and self-etch resin cement (SEC). Material and Methods: The occlusal surfaces of extracted teeth were abraded with a diamond bur to the dentin layer and divided into 5 equal groups (n = 20); G1-control (no desensitizer, only Clearfil aesthetic resin cement (CEC); G2-Gluma and CEC; G3-Bi-fluorid 12 and CEC; G4-FGM desensitizer and CEC; G5-D/Sense Crystal and CEC. Resin cement layers were added to a depth of 8 mm in the control group, and desensitizer was applied to the surfaces before resin cement application in the other experimental groups. A specimen from each group was examined with scanning electron microscopy. The specimens were sectioned to be 1 mm 2 perpendicular to the adhesive layer, and the microtensile test was applied. According to the results of the post hoc Tamhane test, there was a significant difference. (p<0.05). Results: Only the Gluma desensitizer had a significantly lower bond strength value when compared with the other desensitizers and the control group. Conclusions: While dentin with oxalate, fluoride, and strontium chloride-potassium nitrate contamination did not affect the bonding strength of SEC, dentin contamination with glutaraldehyde/HEMA had a negative effect. Keywords. Desensitizer; self-etch resin cement; microtensile bond strength. ÖZ Amaç: Bu in vitro çalışmanın amacı, dentine hassasiyet giderici ajan uygulamasının, self-etch rezin simanın (SEC) mikrogerilim bağlanma dayanımını nasıl etkilediğini araştırmaktır. Gereç ve Yöntem: Çekilmiş dişlerin oklüzal yüzleri elmas frez ile dentin tabakasına kadar aşındırıldı ve 5 eşit gruba ayrıldı (n = 20); G1-kontrol (hassasiyet giderici ajan kullanılmadı, sadece Clearfil estetik rezin siman (CEC); G2-Gluma ve CEC; G3-Bi-fluorid 12 ve CEC; G4-FGM ve CEC; G5-D/Sense Crystal ve CEC. Kontrol grubunda, dentin üzerine 8 mm yüksekliğinde rezin siman tabakası eklendi ve diğer deney gruplarına rezin simandan önce dentin hassasiyet giderici ajanlar uygulandı. Her gruptan bir örnek taramalı elektron mikroskobu ile incelendi. Örnekler dentin-siman bağlantısına dik olarak 1 mm 2 olacak şekilde kesildi ve mikrogerilim bağlanma dayanımı ölçüldü. Post-hoc Tamhane testinin sonuçlarına göre anlamlı bir fark vardı (p <0.05). Bulgular: Dentin hassasiyet giderici ajanlar arasında sadece Gluma, diğer gruplar ve kontrol grubu ile karşılaştırıldığında anlamlı şekilde daha düşük bir bağlanma dayanımına sahipti. Sonuç: Dentin üzerine oksalat, florür ve stronsiyum klorür-potasyum nitrat uygulaması, SEC ile arasındaki bağlanma dayanımını etkilemese de, glutaraldehit/HEMA uygulaması olumsuz etkilemiştir. Anahtar kelimeler: Hassasiyet giderici ajan; Self-etch rezin siman; Mikrogerilim bağlanma testi
Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi, Jan 15, 2020
Aim: This study aims to evaluate the bond strength of SARC to the root canal dentin through the u... more Aim: This study aims to evaluate the bond strength of SARC to the root canal dentin through the use of ultrasonic and sonic activation. Material and Methods: Thirty-six mandibular premolar teeth were used. After preparation-irrigationobturation procedures post space preparation was completed with the drill incident to post system used. Specimens were divided randomly into three groups according to resin cement activation (n=12): No activation (Control), Ultrasonic activation (UA), Sonic activation (SA). Fiber posts were seated and resin cement polymerized. Six slices, 1-mm thick, were obtained from each specimen. A push-out test was performed to slices two, four, and six. Data were analyzed statistically with Kruskal-Wallis and Mann-Whitney U tests. Results: A significant difference was found between activation methods (p<0.05). The control group showed significantly better bond strength values than the ultrasonic and sonic activation groups. Root regions had no significant effect on bond strength (p>0.05). Conclusion: Both ultrasonic and sonic activation of SARC could have negative effects on the bond strength.
Journal of Spectroscopy
The alumino-silicate-fluoride (ASF) bioglass system with empirical formula [(45-x)SiO2-xCaF2-20P2... more The alumino-silicate-fluoride (ASF) bioglass system with empirical formula [(45-x)SiO2-xCaF2-20P2O5-20Al2O3-15CaO] where x = 5, 10, 15, and 20 (wt.%) has been synthesised by using conventional melt-quenching method. In this study, soda lime silica (SLS) glass and clam shell (CS) vitreous waste were utilized as a source of silicon dioxide (SiO2) and calcium oxide (CaO), respectively. The different physical behaviors of ASF bioglass were closely related to the CaF2 content in each composition. The structural analysis shows the presence of various chemical bonds showing the formation of ASF bioglass. The ASF bioglass has many applications in dental field and efforts to improve its formulation can promise a better future in medical procedures.
Journal of Materials Research and Technology
Abstract Glass Ionomer Cement (GIC) is produced from an acid-base reaction between various type o... more Abstract Glass Ionomer Cement (GIC) is produced from an acid-base reaction between various type of alkaline glass powder and polymeric acid. In this research, calcium fluoro-alumino-silicate (CFAS) glass was derived from waste materials such as soda-lime-silica (SLS) glass and clam shell (CS) which are sources of silica and calcium oxide respectively. The polyacrylic acid (PAA) is used to produced mobile carboxyl group and then, react with metal ions on the surface of CFAS glass. To study the influence of ageing time on physical, structural and mechanical properties of GIC, deionized water was used as a soaking medium. The density results increase throughout the ageing time from 7–28 days. The density of GIC at 7 days shows 1.622 g/cm3 and increasing to 1.789 g/cm3 at 28 days. However, the molar volume shows the opposite action comparing with the density of GIC. The molar volume shows continue decreasing from 357.63–324.25 cm3 mol−1. From the XRD result, GIC was indicating amorphous structure during ageing range between 7–28 days. FTIR analysis shows this phenomenon occurs due to the deformation of Si−OH bonding and formation of Si-O-Si simultaneously in the presence of water which is influence the mechanical strength of GIC. The mechanical properties of GIC increase by ageing time through the compressive test from 42.23–50.28 MPa. Thus, the observed results in this study promise the GIC derived from waste materials have a high potential in dental application due to excellence structural and mechanical properties against ageing.
Biomedical Journal of Scientific & Technical Research
Material and Methods: Mandibular premolars with single oval canal were collected for the study. R... more Material and Methods: Mandibular premolars with single oval canal were collected for the study. Root canals were prepared with Reciproc R25 and were randomly divided into six groups (n=10), as follows: group 1, additional instrumentation with SAF and filling using 2Seal and gutta-percha (GP); group 2, additional instrumentation with SAF and filling using Total Fill BC and GP; group 3, additional instrumentation with XP and filling using 2Seal and gutta-percha; group 4, additional instrumentation with XP and filling using TotalFill BC and GP; group 5, canal filling with 2seal and GP without additional instrumentation; group 6, canal filling with Total Fill BC and GP without additional instrumentation. Each sample was sectioned horizontally into 1 mm thick slices at each thirds and push-out test was performed using universal testing machine. Three-way ANOVA and Tukey’s post-hoc tests were performed to compare groups.
The Journal of Prosthetic Dentistry
STATEMENT OF PROBLEM Which type of post improves the performance of endodontically treated mandib... more STATEMENT OF PROBLEM Which type of post improves the performance of endodontically treated mandibular premolars without a ferrule remains unclear. PURPOSE The purpose of this in vitro study was to compare the restoration of endodontically treated mandibular premolars without a ferrule by using different post systems. MATERIAL AND METHODS Thirty extracted mandibular premolars were endodontically treated, and their crowns removed. They were divided into 3 groups with different post systems (n=10): zirconia ceramic posts (ZRPs), fiber posts (FPs), and bundled glass fiber-reinforced composite resin posts (GTPs). After post placement and core fabrication, computer-aided design and computer-aided manufacture (CAD-CAM) lithium disilicate crowns were cemented. The specimens were subjected to thermocycling and mastication simulation before a fracture test in a universal testing machine. The maximum load at which the fracture occurred was recorded, and the fractured specimens were examined by using an optical microscope. The data were analyzed for statistical differences with a 1-way ANOVA and the Tukey honestly significant difference post hoc test (α=.05). RESULTS No statistically significant difference in fracture strength was found among the groups (P=.970). From the light microscopy examination, catastrophic failure was observed in all specimens, and there was no failure of the ceramic crowns. CONCLUSIONS Based on the findings of this in vitro study, the choice of post material with a low or high modulus of elasticity did not prevent catastrophic failures in endodontically treated teeth without a ferrule.
Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi
İş güvenliği ve çalışanların sağlığına yönelik olarak koruyucu ve önleyici faaliyetlerin geliştir... more İş güvenliği ve çalışanların sağlığına yönelik olarak koruyucu ve önleyici faaliyetlerin geliştirilmesi ve uygulanması çalışmalarını yönlendirmek, bu çalışma ve uygulamaların yasalara uygun olarak yürütülmesini sağlamak işverenin görevleri arasındadır. Bu çalışmanın amacı, yapılan dört yıllık kültür verilerinin karşılaştırılarak fakültemiz sağlık çalışanlarının ortak kullanım alanlarının mikrobiyolojik değerlendirmelerinin güvenli ortam sağlanmasına yönelik tedbirlerin alınmasına katkı sağlamasıdır. Materyal ve metod: Örnekler fakültemizde sıklıkla kullanılan alanlardan her yıl tekrarlanmak üzere 4 (dört) yıl (2014, 2015, 2016, 2017), steril distile su ile nemlendirilmiş eküvyonlar ile sürüntü alma yöntemi uygulanarak alınmıştır. Alınan örnekler araştırma hastanesi mikrobiyoloji laboratuarında %5 koyun kanlı agar ve Eozin metilen Blue (EMB) agar besiyerlerine ekim yapılarak etüvde 48 saat 37 o C'de bekletilmiştir. Gün içerisinde alındıkları zamana bağlı olarak üreyen aerob mikroorganizmaların tipleri belirlenmiştir. Bulgular: İlk yılda (2014) yapılan taramalarda dikkat çeken durum, bakteriyal kirlenmenin hatta bazı alanlarda tehlikeli kolonizasyonların olmasıdır. 2015 yılı incelemelerinde fekal oral kirlenmenin olduğu enterik bakteri kolonizasyonları gözlenmesine rağmen tehlikeli kolonizasyonlar gözlenmemiştir. Son iki yıl ise çoğunluk bize cilt florası tespitinin olduğunu göstermektedir. En fazla kontamine olan yerler, telefon, bilgisayar, ünit kreşuarı, pencere, kapı kolları ve hava su spreyi olarak belirlenmiştir. Sonuç: Diş hekimliği ortak çalışma alanında çapraz enfeksiyon kontrolü sağlamada hedef; bireyler veya birey ile yüzeyler arasında geçiş yapabilecek mikroorganizma sayısını azaltmak olmalıdır. Bu amaca yönelik olarak uyulması gereken genel prensiplere dayanarak, ortam bakteri florasının bilinerek, çalışanlarda hijyen duyarlılığını artırmak, güvenli ve sağlıklı çalışma ortamı kazanmada etkili olacaktır. Fakültemizde ilk yıl yapılan çalışma ile alınan tedbirler sonucunda, son yıl görülen ortam mikrobiyolojik çalışması bize bunun sağlanmasının zor olmadığını göstermiştir.