19 research outputs found
Push-out bond strength of two new calcium silicate-based endodontic sealers to root canal dentine
No full textSagsen B, Ustun Y, Demirbuga S, Pala K. Push-out bond strength of two new calcium silicate-based endodontic sealers to root canal dentine. International Endodontic Journal, 44, 1088-1091, 2011
Influence of a short‐time antioxidant application on the dentin bond strength after intracoronal bleaching
No full textKaradas, Muhammet/0000-0002-3357-6896This study evaluated the effects of an antioxidant application on the compromised bond strength of an adhesive to dentin bleached with 35% hydrogen peroxide. the dentin surfaces of the pulp chambers of 70 human third molars were ground, and the specimens were assigned randomly into seven groups, as follows: (a) control (unbleached); (b) bleached for 45 min, bonded immediately; (c) bleached for 45 min, treated with sodium ascorbate (SA) for 2 min, and bonded; (d) bleached for 45 min, bonded after 2 weeks; (e) bleached for 12 days, bonded immediately; (f) bleached for 12 days, treated with SA for 10 min, and bonded; and (g) bleached for 12 days, bonded after 2 weeks. in each group, the multimode adhesive was applied in etch-and-rinse and self-etch modes. the dentin surfaces were covered with a resin-based composite, and the bonded specimens were sectioned to produce composite-dentin sticks. the sticks were attached to a testing machine and subjected to a tensile force, and the representative specimens were examined via scanning electron microscopy. the bond strength was not affected by the application period of the bleaching agent. Both bleaching treatments significantly reduced the bond strength to the dentin in the self-etch or etch-and-rinse mode when compared with the control group. the bond strengths returned to normal levels with the SA applications or by waiting 2 weeks, regardless of the application period of the bleaching gel. the adhesive revealed a higher bond strength in the etch-and-rinse mode than in the self-etch mode
Farklı Polimerizasyon Sürelerinin Rezin Kompozitlerin Mikrosertlik ve Dönüşüm Derecesi Üzerine Etkisi
No full textAmaç: Bu çalışmanın amacı, farklı polimerizasyon sürelerinde bulk-fill ve konvansiyonel rezin kompozitlerin polimerizasyon özelliklerinin monomer dönüşüm derecesi (DC) ve mikrosertlik (MH) açısından değerlendirilmesidir. Materyal ve metod: Bu çalışmada, iki bulk-fill rezin kompozit (Filtek One Bulk Fill Restorative, X-tra Fil) ve iki geleneksel rezin kompozitten (Filtek Z550, Charisma Smart) hazırlanan disk şeklindeki örneklere (6 mm genişliğinde ve 2 mm yüksekliğinde) üç farklı polimerizasyon süresi (20 sn, 60 sn ve 100 sn) uygulandı. Polimerize edilen numunelerin DC'si bir FT-IR/ATR cihazı ile, MH değerleri ise bir Vickers sertlik cihazı ile ölçüldü. Elde edilen veriler istatistiksel yöntemlerle analiz edildi. Bulgular: FT-IR analizi ve Vickers mikrosertlik testi sonuçlarına göre 100 saniye ışık uygulanan grupların DC ve MH değerlerinin diğer gruplara göre anlamlı derecede büyük olduğu ortaya çıkmıştır (pObjective: The aim of this study was to evaluate the polymerization properties of bulk-fill and conventional resin composites in terms of the degree of conversion (DC) and microhardness (MH) at different polymerization times. Materials and Methods: In this study three different polymerization times (20 s, 60 s, and 100 s) were applied to disc shaped samples (6 mm wide; and 2 mm high) prepared from two bulk-fill resin composites (Filtek One Bulk Fill Restorative, X-tra Fil) and two traditional resin composites (Filtek Z550, Charisma Smart). The DC of the polymerized samples was measured with a FT-IR/ATR device, and the MH values were measured with a Vickers hardness device. The collected data were subjected to statistical analysis. Results: The results of the FT-IR analysis and Vickers microhardness test demonstrated that the DC and MH values of the groups exposed to 100 s of light curing were significantly higher than those of the other groups (
Dental caries and body mass index in a sample of 12-year-old eastern Turkish children
No full textAbstractBackground/purposeThe objective of the present study was to investigate the possible correlation between the body mass index (BMI) and dental caries among 12-year-old Turkish children.Materials and methodsThe clinical study was performed on 224 12-year-old children at the Department of Pediatric Dentistry, Atatürk University, Erzurum, Turkey, to determine their dental caries and malnutrition status. To assess the nutritional status, the weight for age, height for age, and BMI were determined. The BMI status was categorized into four groups: 1 (underweight), 2 (normal weight), 3 (overweight), and 4 (obese). The occurrence of dental caries was determined using the decayed, missing, and filled teeth (DMFT) index.ResultsRespective mean DMFT values for BMI-1, BMI-2, BMI-3, and BMI-4 were 1.44, 1.47, 1.81, and 2.33, respectively. There were significant differences between BMI-1 and BMI-4 (P = 0.019, r2 = 0.73) and between BMI-2 and BMI-4 (P = 0.022, r2 = 0.72) values.ConclusionPaedodontics should consider the relationship between patients’ body composition and oral health, in order to provide the best service for pediatric patients, and should advice parents on oral-health promotion
Fiber Postun Kök Dentinine Bağlanma Dayanımı Üzerine Bulk-Fill ve Self-Adhering Kompozit Rezinlerin Etkisi
No full textAmaç: Bu çalışmanın amacı, bulk-fill ve self adeziv kompozitler ile yapıştırılan fiber postların kök dentinine bağlanma dayanımlarını değerlendirmektir. Yöntem: Bu çalışmada tek köklü ve tek kanallı 30 adet çekilmiş insan mandibular premolar dişleri kullanıldı. Diş kronları mine-sement hattından kesilerek kronları uzaklaştırıldı ve kanal tedavisi yapıldı. Post boşlukları post uzunluğuna göre hazırlandıktan sonra kökler, kullanılan materyale göre rastgele 5 gruba ayrıldı (n=30). Çalışmada 5 adet rezin bazlı materyal; RelyX U 200 (3M ESPE, Neuss, Almanya), Grandio Flow (VOCO, Cuxhaven, Almanya), Vertise Flow (Kerr, Kaliforniya, ABD), Filtek Bulk Fill Flowable (3M ESPE, Neuss, Almanya), SDR (Dentsply, Birleşik Krallık). kullanıldı. Bütün köklerden 1 mm kalınlığında horizontal kesitler alındı ve push-out bağlanma dayanımı testi uygulandı. Veriler Tek Yönlü ANOVA ve Tukey HSD Post-Hoc testleri kullanılarak analiz edildi. Bulgular: RelyX ≥ U 200 en yüksek bağlanma dayanım değerini göstermiştir(P<0,05). Vertise Flow SDR’ ye göre de daha düşük bağlanma dayanım değeri sunmuştur(P<0,05). Sonuç: RelyX U200 post uygulamalarında güvenle kullanılabilir.Objectives: The aim of this study is to evaluate the bond strength of fiber posts bonded with bulk-fill and self-adhesive composites to root dentin. Methods: In this study, 30 extracted human mandibular premolars with a single root and a single canal were used. The tooth crowns were cut from the enamel-cement line, the crowns were removed and root canal treatment was performed. After the post spaces were prepared according to the post length, the roots were randomly divided into 5 groups according to the material used (n = 30). In the study, 5 resin-based materials; RelyX U 200 (3M ESPE, Neuss, Germany), Grandio Flow (VOCO, Cuxhaven, Germany), Vertise Flow (Kerr, California, USA), Filtek Bulk Fill Flowable (3M ESPE, Neuss, Germany), SDR (Dentsply, UK). was used. Horizontal sections with a thickness of 1 mm were taken from all roots and a push-out bond strength test was applied. Data were analyzed using One Way ANOVA and Tukey HSD Post-Hoc tests. Results: RelyX U200 showed the highest bond strength value (P<0,05). Vertise Flow showed lower bond strength value compared to SDR. (P<0,05). Conclusion: RelyX U200 can be used safely in post applications
Micro-shear bond strength of universal adhesives used for amalgam repair with or without Alloy Primer.
No full textAim: The aim of this study was to investigate the adhesive performance of three different universal adhesives to repair aged amalgam by composite resins with or without Alloy Primer. Materials and Methods: Sixty amalgam samples were prepared, aged, and randomly divided into 12 main groups according to adhesive procedures used. Composite buildups were placed on amalgam surfaces. After micro-shear bonding test, the fracture surfaces were examined under the scanning electron microscopy statistical analysis was performed using two-way analysis of variance and Tukey's post hoc tests. Results: Without use of Alloy Primer, all of the universal adhesives provided similar bond strength values with conventional adhesives (P > 0.05); however, an Alloy Primer significantly increased the bond strength values of universal adhesives (P 0.05) except for Clearfil SE Bond (P < 0.05). Conclusions: Within the limitations of this study, it can be concluded; using Alloy Primer before universal adhesives increased the bond strength significantly. © 2018 Journal of Conservative Dentistry | Published by Wolters Kluwer - Medknow
Bonding performance of universal adhesives on composite repairs, with or without silane application.
No full textAim: This study aims to investigate the adhesive performance of three different universal adhesives to repair aged composite restorations, with or without the application of silane. Materials and Methods: A hundred and twenty resin composite samples were prepared, aged and randomly divided into 6 main Groups (single bond universal [SBU], All-Bond Universal [ABU], Futurabond U, Clearfil Tri-S Bond, Single Bond 2, and Clearfil SE Bond) and 2 subgroups (with or without silane). A microhybrid composite resin was placed on the aged composite surfaces and light cured. After a micro-shear bonding test, the fracture surfaces were examined under the scanning electron microscopy. Statistical analysis was performed using two-way ANOVA and Tukey's post hoc tests. Results: Among all the universal adhesives, SBU showed the highest bond strength values compared to the other two universal adhesives when used with and without silane (P > 0.05). Between ABU and Futurabond U, no significant difference was observed with silane (P > 0.05) and without silane (P > 0.05). Among conventional adhesives, there was no statistically significant difference (P > 0.05) both with and without silane. Conclusion: Within the limitations of this study, while SBU can be safely used with and without the application of silane, Futurabond U cannot be used without silane. © 2018 Journal of Conservative Dentistry | Published by Wolters Kluwer - Medknow
Cyclic fatigue resistance of new reciprocating files (Reciproc Blue, WaveOne Gold, and SmartTrack) in two different curved canals.
No full textAimIn the present study, we compared the cyclic fatigue resistance (CFR) of Reciproc Blue, WaveOne Gold, and SmartTrack files in curved artificial canals
Evaluation of apically extruded debris during the removal of canal filling material using three different Ni-Ti systems and hand files in teeth with simulated apical root resorption
No full textAim To compare the weight of apically extruded debris produced during the removal of root canal filling material using various files in extracted teeth with simulated apical root resorption. Methodology The root canals of one hundred and twenty extracted mandibular premolar teeth were prepared with Revo-S files and filled using a cold lateral compaction technique with gutta-percha and a resin-based sealer (AdSeal; Meta-Biomed, Cheongwon, Korea). Sixty teeth were randomly assigned to four control groups (hand file, ProTaper Universal retreatment file, D-RaCe retreatment file, and Reciproc file) for the removal of root canal filling material. The apical portion of the remaining 60 teeth was modified to simulate apical root resoption, and the teeth were then randomly divided into 4 experimental groups (using the same techniques as in the control groups) for the removal of root canal filling material. Apically extruded debris was collected into pre-weighed Eppendorf tubes and then dried. The mean weight of the apically extruded debris was assessed with an analytical balance to an accuracy of 10(-4) g. Data were analysed using two-way analysis of variance and a Tukey's post hoc test. Results In the simulated apical root resorption groups, all file systems were associated with significantly more debris extrusion compared to the groups without simulated resorption (P 0.05). In the groups without simulated apical root resorption, there was no significant difference between Reciproc, ProTaper Universal retreatment and D-RaCe retreatment files (P> 0.05). The time required to remove the root canal filling material was as follows: hand file > ProTaper Universal retreatment = D-RaCe retreatment > Reciproc (P < 0.05). Conclusions The weight of apically extruded debris was significantly greater in teeth with simulated apical root resorption than in those teeth without simulated apical root resorption. Hand files were associated with significantly more apically extruded debris in all groups during removal of root canal filling material
Investigation of ellagic acid rich-berry extracts directed silver nanoparticles synthesis and their antimicrobial properties with potential mechanisms towards Enterococcus faecalis and Candida albicans
No full textThe essential goals of this present study are to elucidate the formation mechanism of ellagic acid rich-blackberry, BBE, (Rubus fruticosus L.) and raspberry, RBE, (Rubus idaeus L.) extracts directed silver nanoparticles and to investigate thier antimicrobial properties towards model dental pathogens E. faecalis and C. albicans compared to BBE, RBE, NaOCl, CHX and EDTA. Both %5 w/w of BBE and RBE reacted with 5 mM Ag+ ions at room temperature (25 degrees C) under mild-stirring, the formation of BBE and RBE directed b@Ag NP and r@Ag NP was monitored over time by using an Uv-vis spectrophotometer. Both b@Ag and r@Ag NPs were also complementarily characterized with SEM and FT-IR. In terms of the antimicrobial studies, b@Ag NP, r@Ag NP, %5 BBE and RBE, 5 mM AgNO3, %5 NaOCl, %1,5 CHX and %15 EDTA were separately incubated with E. faecalis and C. albicans suspensions. The results were evaluated with student t-test using GraphPad Prism 8.0.1 statistical software (P < 0.05). While formation of b@Ag NP was confirmed with characteristic absorbance at similar to 435 nm in 20 mM (min) of incubation, r@Ag NP did not give absorbance till 80 mM owing to concentration of ellagic acid acted as a reducing and stabilizng agent for formation of the Ag NPs. Intrestingly, 50 ppm r@Ag NP inactivated similar to 89% and similar to 99% of E. faecalis and C. albicans cell, respectively, similar to 25% and similar to 40% cell inactivations for E. faecalis and C. albicans were observed respectively with 50 ppm b@Ag NP. We showed that 50 ppm r@Ag NP has effective antimicrobial property as much as mostly used %5 NaOCl and %1,5 CHX solutions
