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Öğe Susceptibility to discoloration of dental restorative materials containing dimethacrylate resin after bleaching(Springer, 2023) Yılmaz, Merve Nur; Gül, PınarThe aim of this study is to compare the susceptibility to discoloration of dental restorative materials containing dimethacrylate resin after bleaching. In this study, resin-modified glass ionomer, polyacid-modified composite resin, giomer, posterior composite resin, anterior composite resin, bulk fill composite resin, flowable bulk fill composite resin, ormocer, indirect composite resin and hybrid ceramics were used as restorative material containing dimethacrylate resin. 20 samples were prepared from each material in accordance with the manufacturer's instructions. After the baseline colors are measured, the samples were randomly divided into four subgroups as office bleaching, home bleaching and a separate control group for each type bleaching method. Then, the samples were bleached and colored. Color measurements of the samples were repeated after exposure to bleaching and coloring. Then, Delta E00 and whiteness index (WID) were calculated. Data were analyzed using Paired-Samples T Test, two-way ANOVA, Repeated Measures ANOVA and Tukey post-hoc tests. Statistical significance level was taken as p < 0.05. In terms of bleaching systems, Opalescence Boost was found to cause more whitening in materials but more discoloration (p < 0.05). In terms of materials, it was found that the most susceptible materials to coloration were Clearfil Majesty Posterior, Filtek Bulk Fill Posterior Restorative, Filtek Bulk Fill Flowable and Fuji II LC, while the least susceptible materials were CAD/CAM materials (p < 0.05). The bleaching process increases the susceptibility to coloration of materials containing dimethacrylate resin.Öğe Monomer release from dental restorative materials containing dimethacrylate resin after bleaching(SPRINGER HEIDELBERG, 2022) Yılmaz, Merve Nur; Gül, PınarObjective The aim of this study is to determine the type and amount of monomer released over time after bleaching was applied to dental restorative materials containing dimethacrylate resin. Materials and methods Thirteen different restorative materials containing dimethacrylate resin were used in this study. Twenty samples were prepared from each material and the samples were randomly divided into 4 subgroups, namely, office bleaching, home bleaching, and separate control group for each of the bleaching methods. After bleaching, the samples were stored in 75% ethanol solution for 1, 14, and 28 days. Analysis of the samples collected to determine the type and amount of residual monomer released from the materials was performed using a liquid chromatography-tandem mass/mass spectrometer (LC-MS/MS). Data were analyzed using Friedman and Kruskal-Wallis tests. Statistical significance level was taken as p < 0.05. Results In terms of bleaching groups, mostly no significant difference was found between the groups in each time period in restorative materials (p > 0.05). In terms of time periods, it was determined that the amount of release of all monomers was decreased over time. In terms of restorative materials, the highest monomer release was detected in composite resin groups and the least monomer release was detected in CAD/CAM blocks. Conclusion Although monomers were released from all materials, bleaching did not affect the amount of released monomer. Amounts of released monomers were generally below toxic limits.Öğe Effects of dyes used in photodynamic therapy on color stability of composite resins(Nihon Univ, School Dentistry, 2022) Özkoçak, Begüm Büşra Cevval; Özkoçak, İsmail; Ağaccıoğlu, MervePurpose: The aim of this study was to evaluate the effect of dyes used in photodynamic therapy (PDT) on color changes of resin-based composites (RBCs). Methods: A total of 120 composite discs were made of microfilled, nanohybrid, and nanocemmic RBCs, and the CIE Lab system was used to assess initial colors with a spectrophotometer. Photosensitizers were used in accordance with the experimental design, as follows: MB (methylene blue), TB (toluidine blue). ICG (indocyanine green), and control (no dye). The samples were irradiated with a 940-nm diode laser. After irradiation, the photosensitizers were removed with distilled water (Delta E-1) and sodium hypochlorite (Delta E-2), and final colors were measured. Data were analyzed by the three-way ANOVA and Bonferroni tests (alpha= 0.05). Results: There was no statistically significant difference between the ICG and control groups; however, the TB and MB groups exhibited the strongest staining. The nanohybrid RBC exhibited the greatest color change, and there were no significant differences between the microhybrid and nanoceramic RBCs. After NaOCl irrigation, Delta E-2 values decreased to clinically acceptable values (Delta E-2 < 3.3). Conclusion: The intensity of staining of the RBCs differed according to the type of photosensitizer used and the content of the composite resin. The irrigant NaOCl was effective in removing discoloration.Öğe Evaluation of biochemical changes in dental tissues after different office bleaching methods(Sage Publications Ltd, 2019) Karaarslan, Emine Şirin; Özmen, Zeliha Cansel; Aytaç, Fatma; Bıçakçı, Ali Altuğ; Buldur, Mehmet; Özkoçak, Begüm Büşra CevvalThe color of the teeth is an important topic for many people and can be influenced by intrinsic and extrinsic stains. There is an increasing demand for whitening of the teeth year by year. The most popular way of whitening is "bleaching," which is the result of the breakdown of pigments located in the enamel and/or the dentin, caused by reactive oxygen species (ROS) released from bleaching agents. These bleaching agents could increase matrix metalloproteinase (MMP)-mediated collagen degradation in dentin. The aim of this study was to compare biochemical changes and oxidative stress levels of the human premolar dentin-pulp complex after three different bleaching methods containing hydrogen peroxide (H2O2) bleaching agents. Individuals, whose first four premolars were extracted for orthodontic purposes, included into the study. Group 1-Laser: bleaching gel containing 46% H2O2 (LaserWhite20 whitening gel, Biolase Technology Inc., San Clemente, CA, USA) and a diode laser activation (Ezlase 940 nm system). Group 2: 35% H2O2 containing whitening gel (Whiteness HP Maxx, FGM) and halogen light source activation (Optilux 501, Kerr, Orange, CA, USA). Group 3: 35% H2O2 containing whitening gel (Whiteness HP Maxx, FGM). Group 4-Control: No whitening treatment. According to the test results, there were no significant differences among groups in the values of cathepsin B and MMP proteolytic activities (p > 0.05). The total ROS values released from the dentin tissue were higher than those obtained from the pulp tissue (p < 0.05). There were significant differences among the bleaching groups in the ROS values released from the dentin tissue.Öğe Effects of photodynamic therapy with indocyanine green on Streptococcus mutans biofilm(Elsevier Science Bv, 2019) Bal, Fatma Aytaç; Özkoçak, İsmail; Çadırcı, Bilge Hilal; Karaarslan, Emine Şirin; Çokdinleyen, Melis; Ağaccıoğlu, MerveBackground: The current procedures for treating tooth decay are not always guaranteed to successfully remove all microorganisms which cause disease. For elimination of bacteria and prevention of their effects, different methods are recommended, such as antibacterial materials and cavity disinfectants. The aim of this study was to compare the antibacterial activity of photodynamic therapy (PDT) using diode laser with indocyanin green (ICG) on Streptococcus (S.) mutans biofilm with conventional methods. Methods: Ninety human molars were divided into 9 groups: negative control, positive control, CHX, NaOCI, gaseous ozone, erbium (Er):YAG laser, diode laser, and indocyanin green/ICG, and PDT. Cavities were then cut into the teeth (2 per tooth, 20 cavities per group) and sterilized. For all of the groups, with the exception of the negative control group, 10(5) CFU/mL of the active S. mutans culture were inoculated into the cavities and then incubated at 37 degrees C for 72 h. Then, dentin chips (25 +/- 5 mg) were collected from cavity walls and spread on Mueller-Hinton agar media after decimal dilution. The colonies were counted after incubation at 37 inverted perpendicular C for 24 h. Results: All the treatments significantly reduced the number of S. mutans compared with the positive control group (p < 0.05). The antimicrobial effectiveness of CHX, NaOCl, ozone, PDT, Er:YAG laser, and diode laser groups were similar. The lowest bacterial reduction was observed in the ICGgroup. Conclusions: This work concludes that PDT using diode laser with ICG may be suggested on the cavity disinfection after caries excavation as an alternative to conventional methods.Öğe Effect of different mouthwashes on discoloration of plaque-free tooth surfaces(Mosher & Linder, Inc, 2018) Atala, Mustafa Hayati; Ustaoğlu, Gülbahar; Atala, Nagehan; Yeğin, ElifPurpose: To evaluate the tooth discoloration effect of the daily use protocol of six different mouthrinses. Methods: 70 extracted caries -free central incisors were divided into seven groups (n=10/per group): Group 1: Curasept Anti Discoloration System; Group 2: CB12; Group 3: Listerine Zero; Group 4: Listerine Cool Mint; Group 5: Colgate Plax; Group 6: Kloroben. The teeth were exposed to the mouthrinse for 2 minutes daily for 3 weeks. Color measurement was performed four times: at the beginning of the study, and after 1, 2 and 3 weeks, with a digital spectrophotometer (Vita Easyshade Advanced). Color changes (Delta E) were calculated and ANOVA and post hoc Tukey's test were used for statistical analysis. Results: Although there was no statistically significant difference between the Colgate Plax and control groups, both groups had a significant difference from the other groups within all Delta E1, Delta E2 and Delta E3 values.Öğe Evaluation of the effects of different remineralizing agents on Streptococcus mutans biofilm adhesion(Taylor & Francis Ltd, 2018) Karaarslan, Emine Şirin; Aytaç, Fatma; Çadırcı, Bilge Hilal; Ağaccıoğlu, Merve; Taştan, Emine; Özkoçak, Begüm Büşra CevvalThe aim of the study was to compare the effects of different remineralization methods that are well established in clinical and daily use on S. mutans biofilm adhesion. In this study 72 human third molars were used. From each tooth two pieces of 4 mm x 7 mm enamel blocks were acquired. The samples were divided into 6 groups in which include 10 samples per time period (24h and 48 h) and for each remineralization method; control, flouride, ozone, CPP-ACP, arginine, novamin. After remineralization procedures, enamel surfaces were covered with saliva. 10(5) CFU/mL of active S. mutans culture were inoculated onto the samples. S. mutans colonies were counted with Plate Count Agar (PCA) decimal dilution method. Micromorphologic effects of different remineralization methods were observed by Scanning Electron Microscopy (SEM). The most S. mutans biofilm formation for both time periods was observed in the control group whereas the less biofilm adhesion was showed in the arginine group. There were no statistically significant differences among remineralization agents (p > 0.05). In the control group there was statistical difference between 24 h and 48 h (p < 0.005) but in the other study groups there were no significant difference between the time periods (p > 0.05). Remineralization agents did not significant differ on S. mutans biofilm adhesion.Öğe Comparison of eluted monomer from different indirect and direct resin composites(Taylor & Francis Ltd, 2017) Cebe, Fatma; Cebe, Mehmet Ata; Polat, Serdar; Bıçakçı, HasanIndirect resin composites used in indirect restorations have been used as alternative methods to avoid the negative effects of a direct application. The composition and structure of these are similar to a direct composite. Several authors have discussed the elution monomer from resin composites because it is a crucial factor in optimizing the physical properties and biocompatibility of resin composites. The aim of this study was to compare the elution of monomers from different resin composites using high-performance liquid chromatography (HPLC). Indirect composites including Signum, Gradia, and Solidex, and direct composite Filtek Ultimate were used. The samples (2 x 5 mm) were prepared and polymerized for 20 seconds with a light-emitting diode unit. A secondary curing was then applied to the indirect resin composites. After fabrication, each sample was immediately immersed in a 75 wt% ethanol/water solution and analyzed by HPLC. The obtained data were analyzed with one-way ANOVA and Tukey HSD (p < 0.05). Residual monomers were eluted from indirect and direct resin composites and the amount of eluted monomers increased over time. The highest mean concentrations of residual Bis-GMA, UDMA, TEGDMA, and HEMA were detected with the Filtek Ultimate (2,342 mu M), Solidex (7,908 mu M), Signum (2.8 mu M), and Filtek Ultimate (9.7 mu M), respectively. The highest amount of eluted monomer concentrations detected was viewed as critical for toxic reactions in human cells.Öğe The effects of different restorative materials on the detection of approximal caries in cone-beam computed tomography scans with and without metal artifact reduction mode(Elsevier Science Inc, 2017) Cebe, Fatma; Aktan, Ali Murat; Özsevik, Abdul Semih; Çiftçi, Mehmet Ertuğrul; Sürmelioğlu, Hatice DeryaObjectives. The aim of this study was to investigate the influence of artifacts produced by different restorative materials on the detection of approximal caries in cone-beam computed tomography (CBCT) scans with and without the application of an artifact-reduction (AR) option. Study Design. Ninety-eight noncavitated premolar and molar teeth were placed with approximal contacts consisting of 2 sound or carious teeth and 1 mesial-occlusal-distal restored tooth with resin-modified glass-ionomer cement (RMGIC), amalgam, composite, ceramic-based composite (CBC), or computer-aided designecomputer-aided manufacturing (CADCAM) zirconia materials in between. The teeth were scanned with a CBCT system with and without the AR option. Images were evaluated by 2 observers. The teeth were histologically evaluated, and sensitivity, specificity, and areas under the receiver operating characteristic (ROC) curve were calculated according to the appropriate threshold. Results. Specificity and sensitivity values for contact surfaces ranged from 0-48.39 and 82.93-98.40, respectively. The AR option affected (P < .05) approximal caries detection of the amalgam, composite, CAD-CAM, and CBC groups in contact surfaces and composite and RMGIC groups in noncontact surfaces. Conclusion. Artifacts produced by different restorative materials could affect approximal caries detection in CBCT scans. Use of the AR option with CBCT scans increases the accuracy of approximal caries detection. (Oral Surg Oral Med Oral Pathol Oral Radiol 2017;123: 392-400)Öğe Effect of erbium:yttrium aluminum garnet laser on bond strength of a total-etch adhesive system to caries affected dentin on gingival wall(Wolters Kluwer Medknow Publications, 2017) Cebe, Fatma; Bülbül, Mehmet; Şimşek, İrfan; Cebe, Mehmet Ata; Öztürk, BoraPurpose: To assess the effect of the erbium:yttrium aluminum garnet (Er:YAG) laser on bond strength of a total-etch adhesive system to the caries-affected dentin on the gingival wall. Materials and Methods: Ten human molars with proximal carious lesions were randomly divided into two groups. In the first group, the carious dentin was removed with a bur, whereas in the second group it was removed with the Er:YAG laser. Carious lesions were excavated with one of these two techniques until laser fluorescence values decreased to 15 in the center of the lesions. The teeth were then restored with a total-etch adhesive system (Adper Single Bond 2) and composite resin (Filtek Z250). Five teeth from each group were sectioned to obtain 1 mm(2) stick-shaped microtensile specimens from each tooth. Twenty-five specimens were obtained for each group with using this technique. The data were analyzed in independent-samples t-test (a = 0.05). For each removal technique, one sample was analyzed using scanning electron microscopy. Results: No statistically significant differences were found between the bond strength of the Er:YAG laser and the bur-treated groups (P > 0.05). Conclusion: The Er:YAG laser treatment did not negatively affect the bonding performance of the total-etch adhesive system to caries-affected dentin on the gingival wall.Öğe Effect of caries removal techniques on bond strength to caries affected dentin on gingival wall: AFM observation of dentinal surface(Taylor & Francis Ltd, 2016) Cebe, Mehmet Ata; Öztürk, Bora; Karaarslan, Emine ŞirinObjective: The purpose of this study was to evaluate the effect of different caries removal techniques on the bond strength of two adhesive systems. Materials and Methods: Seventy human molar teeth that had proximal carious lesions were randomly divided into four groups according to the technique used to remove the caries: a conventional steel bur, an Er:YAG laser, a chemomechanical Carisolv((R)) gel, and air polishing. The groups were then divided into two subgroups according to the adhesives used: Clearfil S-3 (Kuraray Co., Ltd, Tokyo, Japan) and Adper SE Plus (3M ESPE, St Paul, MN, USA). The enamel and superficial dentin of the crown was flattened and caries were removed using different methods. Teeth were restored with composite and three 1mm(2) stick-shaped microtensile specimens were prepared from each tooth. For each removal technique, the surface roughness of one dentin sample was analyzed using atomic force microscopy (AFM). The microtensile bond strength data were then analyzed using a two-way ANOVA, Kruskal-Wallis and Mann-Whitney U tests, and multiple comparison tests (p=0.05). Results: The two-way ANOVA showed that the effects of the cavity preparation techniques and adhesive systems and their interaction were statistically significant (p<0.05). The TBS values were highest when bonding with Adper SE Plus to cavities prepared with the steel bur (37.20 +/- 11.65MPa) and lowest when bonding with Clearfil S-3 Bond to cavities prepared with the Er:YAG laser (16.74 +/- 6.95MPa). Conclusion: The caries removal techniques affected the bond strength values of the self-etch adhesive systems.Öğe Bond strength of repaired composite resins: surface treatments, adhesive systems, and composite type(Taylor & Francis Ltd, 2016) Karaarslan, Emine Şirin; Özsevik, Abdul Semih; Cebe, Mehmet Ata; Sürmelioğlu, Hatice Derya Gürsel; Tosun, SametThe aim of the present study was to investigate the effects of three different surface treatments and two different adhesives on the microtensile bond strength (TBS) of repaired composites using the same or different type of resin. Twenty-four nano-hybrid (Ceram X mono-C) and 24 nanofilled (Filtek Ultimate-F) composite discs were prepared. The specimens were aged with 5000 thermocycles and randomly divided into groups according to the surface treatment methods: (a) phosphoric acid (b) Er:YAG laser and (c) aluminum trioxide particle (air abrasion). Fresh composite resins (C and F) were added to the treated surfaces with two different adhesives (two-step and one-step self-etch adhesives). Then, the specimens were aged again. The stick-shaped specimens were prepared from the discs (n=25) and the sticks were subjected to the TBS test. Results indicated that significant differences were found in TBS values among the surface treatment methods. In the C groups, the highest TBS value (41.3 +/- 8.3MPa) was recorded in the air abrasion and one-step self-etch adhesive group, which were repaired with the same kind of composite. In the F groups, the highest TBS value was observed in the air abrasion and one-step self-etch adhesive (37.6 +/- 12.3MPa) group. The treatment with air abrasion is more effective than the others, and it may be suggested for composite repair.Öğe Comparison of different caries detectors for approximal caries detection(Elsevier Taiwan, 2016) Bozdemir, Esin; Aktan, Ali Murat; Özsevik, Abdülsemih; Kararslan, Emine Şirin; Çiftçi, Mehmet Ertuğrul; Cebe, Mehmet AtaBackground/purpose: Detection of approximal caries may be difficult using conventional methods including visual inspection (VI) and radiography. The purpose of this in vitro research was to evaluate the efficiency of light-emitting diode (LED) and laser fluorescence (LF) devices, and radiographic and visual examination in approximal caries diagnosis. Materials and methods: One hundred and fifty-six approximal regions were evaluated. All approximal regions were investigated using LED and LF tools after radiography and VI were performed. Histological evaluation of teeth was performed using stereomicroscopy. The area under the receiver operating characteristic curve and accuracy, specificity, sensitivity values calculated regarding approximal caries diagnose. Results: The specificity of the bitewing examination was higher for both T1 and T2 thresholds (0.97 and 0.99, respectively), and the LF device showed better sensitivity at each threshold compared with the other devices used for caries diagnosis (0.94 at T1 and 0.79 at T2). The receiver operating characteristic curves presented that the LF device was more successful than the other techniques at T1 threshold and VI was better than the other caries detection methods at T2 threshold. The kappa values for interobserver agreements were 0.43 (LF pen), 0.33 (LED device), 0.55 (VI), and 0.75 (bitewing examination). Conclusion: The ability of bitewing radiography to identify sound surfaces was better than that of the other methods. The LF device was the most sensitive tool for detecting approximal surfaces with caries, followed by the LED device. Copyright (C) 2016, Association for Dental Sciences of the Republic of China. Published by Elsevier Taiwan LLC. This is an open access article under the CC BY-NC-ND license.Öğe Üç farklı üniversal adeziv sistemin pürüzlendirip yıkamalı ve kendinden pürüzlendirmeli kullanımının makaslama bağlanma dayanımlarının karşılaştırılması(Aves Press Ltd, 2016) Cebe, Mehmet Ata; Bıçakçı, Hasan; Zencirli, Ömer; Cebe, Fatma.Amaç: Bu çalışmanın amacı 3 farklı üniversal adeziv sistemin pürüzlendirip yıkamalı ve kendinden pürüzlendirmeli teknikler ile kullanıldıklarında çürükten etkilenmiş dentinde elde edilen makaslama bağlanma dayanımlarının karşılaştırılmasıdır. Yöntemler: Bu çalışmada 120 adet çekilmiş çürüklü insan büyük azı dişi kullanıldı. Çürük, yüzeyde çürükten etkilenmiş dentine ulaşılana kadar uzaklaştırıldı. Dişler rastgele 6 gruba ayrıldı ve akril kalıplara gömüldü. SBU-s: Single Bond Universal (3M ESPE, St Paul, ABDSBU) kendinden pürüzlendirmeli teknik, ABU-s: All Bond Universal (Bisco Inc, Schaumburg, ABD- ABU) kendinden pürüzlendirmeli teknik, CUB-s: Clearfil Universal Bond (Kuraray Noritake Dental Inc., Okayama, Japonya- CUB) kendinden pürüzlendirmeli teknik, SBU-t: SBU pürüzlendirip yıkamalı teknik, ABU-t: ABU pürüzlendirip yıkamalı teknik ve CUB-t: CUB pürüzlendirip yıkamalı teknik kullanılarak oluşturuldu. Hazırlanan örneklere nanofil kompozit olan Filtek Ultimate Universal Restorative (3M ESPE, St. Paul, ABD) ile restorasyonlar yapıldıktan sonra makaslama bağlanma dayanımı testi yapıldı. Veriler tek yönlü varyans analizi (ANOVA) ve bağımsız t testi ile değerlendirildi (α=0,05). Bulgular: Farklı üniversal adezivlerin pürüzlendirip yıkamalı ve kendinden pürüzlendirmeli kullanımları karşılaştırıldığında anlamlı fark görülmedi (p>0,05). Aynı adezivin farklı kullanımları karşılaştırıldığında ise anlamlı fark sadece CUB grubunda gözlendi. Pürüzlendirip yıkamalı kullanımında daha düşük değerler elde edildi (p<0,05). Sonuç: Üniversal adezivler çürükten etkilenmiş dentinde kullanılacaklar ise kendinden pürüzlendirmeli kullanımları tercih edilebilir.Öğe Effects of hemostatic agents on shear bond strength of orthodontic brackets(Wolters Kluwer Medknow Publications, 2015) Okşayan, Rıdvan; Sökücü, Oral; İşman, N. E.; Kayalı, K. M.; Cebe, Mehmet AtaObjectives: The aim of this study was to determine the effects of blood contamination and hemostatic agents on shear bond strength (SBS) of brackets and bond failure. Materials and Methods: The study material consisted of 57 freshly extracted human premolar and randomly divided into four groups: Group I, control group (n0 = 14); Group II, contamination with blood (n = 13); Group III, contamination with epinephrine ( n = 14); and Group IV, contamination with Ankaferd blood stopper (ABS) ( n = 16). After the bracket bonding procedure, all bonded teeth thermal cycled in deionized water at 5 2 degrees C to 55 2 degrees C for 500 cycles. SBS was applied using a universal test machine. Results: According to Kruskal-Wallis test significant differences were found among the groups P < 0.05. Furthermore, significant differences were recorded between groups with Mann-Whitney U statistical test with Bonferroni correction (P = 0.0083). Conclusions: Examples contaminated with blood showed a statistically significant lower in vitro SBS than those contaminated with epinephrine, ABS, and control groups. Clinical Significance: In impacted tooth surgical operations, blood contamination poses a substantial risk of bond failure in bonding attachments applications to the impacted teeth. Epinephrine and ABS may be used on surgical exposed impacted teeth operation for the prevention of blood contamination.Öğe Bonding performance of two newly developed self-adhering materials between zirconium and dentin(Medknow Publications & Media Pvt Ltd, 2015) Cebe, Mehmet Ata; Polat, Serdar; Cebe, Fatma; Tunçdemir, Makbule Tuğba; İşman, ErenPurpose: This study evaluated the effect of four resin materials on the shear bond strength (SBS) of a ceramic core material to dentin. Materials and Methods: Sixty molar teeth were embedded in a self-curing acrylic resin. All specimens were randomly divided into four groups of teeth, each according to the resin cement used. Sixty cylinders were then luted with one of the four resin materials to dentin (GC EQUIA, Panavia F, Variolink II and Vertise). Then, specimens were stored in distilled water at 37 (o) C for one day. Shear bond strength of each specimen was measured using a universal testing machine at a crosshead speed of 0.5 mm/minute. The bond strength values were calculated in N, and the results were statistically analyzed using a Kruskal-Wallis and Bonferroni corrected Mann-Whitney U tests. Results: The shear bond strength varied significantly depending on the resin materials used ( P < 0.05). The specimens luted with GC EQUIA showed the highest shear bond strength (25.19 6.12), whereas, the specimens luted with Vertise flow (8.1 2.75) and Panavia F (11.17 3.89) showed the lowest. Conclusion: GC EQUIA material showed a higher shear bond strength value than other resin materials.Öğe Evaluation of the bond strength between aged composite cores and luting agent(Korean Acad Prosthodontics, 2015) Polat, Serdar; Cebe, Fatma; Tunçdemir, Alirıza; Öztürk, Caner; Üşümez, AslıhanPURPOSE The aim of this study was to evaluate effect of different surface treatment methods on the bond strength between aged composite-resin core and luting agent. MATERIALS AND METHODS. Seventy-five resin composites and also seventy-five zirconia ceramic discs were prepared. 60 composite samples were exposed to thermal. aging (10;000 cycles, 5 to 55 degrees C) and different surface treatment. All specimens were separated into 5 groups. (n=15): 1) Intact specimens 2) Thermal aging-air polishing 3) Thermal aging- Er:YAG laser irradiation 4) Thermal aging- acid etching 5) Thermal-aging. All specimens were bonded to the zirconia discs with resin cement and fixed to universal testing machine and bond strength testing loaded to failure with a crosshead speed of 0.5 mm/min. The fractured surface was classified as adhesive failure, cohesive failure and adhesive-cohesive failure. The bond strength data was statistically compared by the Kruskal-Wallis method complemented by the Bonferroni correction Mann-Whitney U test. The probability level for statistical significance was set at alpha=.05. RESULTS. Thermal aging and different surface treatment methods have significant effect on the bond strength between composite-resin cores and luting-agent (P<.05). The mean baseline bond strength values ranged between 7.07 +/- 2.11 and 26.05 +/- 6.53 N. The highest bond strength of 26.05 +/- 6.53 N was obtained with Group 3. Group 5 showed the lowest value of bond strength. CONCLUSION. Appropriate surface treatment method should be applied to aged composite resin cores or aged-composites restorations should be replaced for The optimal bond strength and the clinical success.Öğe Elution of monomer from different bulk fill dental composite resins(Elsevier Sci Ltd, 2015) Cebe, Mehmet Ata; Cebe, Fatma; Cengiz, Mehmet Fatih; Çetin, Ali Rıza; Arpağ, Osman FatihObjective. The purpose of this study was to evaluate the elution of Bis-GMA, TEGDMA, HEMA, and Bis-EMA monomers from six bulk fill composite resins over four different time periods, using HPLC. Methods. Six different composite resin materials were used in the present study: Tetric Evo Ceram Bulk Fill (Ivoclar Vivadent, Amherst, NY), X-tra Fill (VOCO, Cuxhaven, Germany), Sonic Fill (Kerr, Orange, CA, USA), Filtek Bulk Fill (3M ESPE Dental Product, St. Paul, MN), SDR (Dentsply, Konstanz, Germany), EQUIA (GC America INC, Alsip, IL). The samples (4 mm thickness, 5 mm diameter) were prepared and polymerized for 20s with a light emitted diode unit. After fabrication, each sample was immediately immersed in 75 wt% ethanol/water solution used as extraction fluid and stored in the amber colored bottles at room temperature. Ethanol/water samples were taken (0.5 mL) at predefined time intervals:10 m (T1), 1 h (T2), 24h (T3) and 30 days (T4). These samples were analyzed by HPLC. The obtained data were analyzed with one-way ANOVA and Tukey HSD at significance level of p < 0.05. Results. Amount of eluted Bis-EMA and Bis-GMA from Tetric Evo Ceram Bulk Fill and amount of eluted TEGDMA and HEMA from X-tra Fill higher than others composites (p < 0.05). Significance. Residual monomers were eluted from bulk fill composite resins in all time periods and the amount of eluted monomers was increased with time. (C) 2015 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.Öğe Evaluation of the permeability of five desensitizing agents using computerized fluid filtration(Medknow Publications & Media Pvt Ltd, 2015) Dündar, Ayşe; Yavuz, Tuğba; Oruçoğlu, Hasan; Daneshmehr, L.; Yalçın, MuhammetObjective: The aim of this study was to evaluate the permeability of five desensitizing agents using computerized fluid filtration (CFF) test method. Materials and Methods: Sixty dentin discs of 500 200-mm-thick were prepared from middle dentin of bovine incisors without exposed the pulp and then randomly divided into five groups (n = 12). The permeability of the discs was measured using the CFF test method before and after application of the following desensitizers: Admira Protect (Voco, Cuxhaven, Germany), Seal and Protect (Dentsply, Konstanz, Germany), Sensi Kill (DFL, Brazil), Systemp Desensitizer (Ivoclar Vivadent, Liechtenstein), BisBlock (Bisco, USA). Fluid movement measurements were made at 2-min intervals for 8 min, and a mean of the values obtained was calculated for each specimen. The results were analyzed using Kruskal-Wallis test and Wilcoxon signed ranks tests with a significance threshold of P < 0.05. Results: There were no significant differences in permeability among desensitizing agents (P > 0.05); however dentin permeability was reduced in all groups (P < 0.05). Conclusion: The in vitro fluid conductance of dentin discs were reduced by treating with these five desensitizing agents.Öğe Antibacterial effect of dental cements evaluated using agar diffusion test(Taylor & Francis Ltd, 2015) Dündar, Ayşe; Karaçam, Nejla; Yavuz, Tevfik; Öztürk, Nilgün; Pınarkara, YaseminPurpose: Secondary caries can occur around the restoration, fixed prosthesis, and orthodontic band margins because of cariogenic bacteria. Long-lasting antibacterial effectiveness of dental cements used contemporarily can reduce this phenomenon. The purpose of this study was to examine the antibacterial activities of nine dental cements (BisCem((R)), Super-Bond C&B, Rely X-TM, Panavia(TM) F 2.0, Variolink((R)) II, Unitek(TM) Multi Cure, Multilink((R)) Automix, Clearfil(TM) Esthetic Cement, Transbond(TM) LR) using agar diffusion test. Materials and methods: The test materials were inserted into the wells of Muller Hinton agar plates inoculated with Streptococcus mutans and Streptococcus salivarious. The diameters of the inhibition zones produced around the materials were measured after 24h of incubation. Two-Way ANOVA, the Kruskal-Wallis, and the Mann-Whitney U tests at a significance level of pResults: Unitek Multi Cure cement exhibited a significant difference from the control group against both S. mutans and S. salivarious (p<0.05). While the zone of inhibition of Unitek Multi Cure cement was shorter (8.50 +/- 1.77) than the control group (12.63 +/- 1.30), Unitek Multi Cure had antibacterial effect against S. mutans and S. salivarious (p<0.05). S. mutans displayed a significantly lower resistance to Unitek Multi Cure, BisCem, and Superbond C&B than S. salivarious (p<0.05). Conclusion: Conventional glass ionomer cement, Unitek Multi Cure, exhibited greatest in vitro antibacterial activity against both S. mutans and S. salivarious. Formation of dental caries had been suppressed by the fluoride-releasing GICs.
