9 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
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 (
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
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
Three-year clinical performance of two indirect composite inlays compared to direct composite restorations
No full textObjective: Despite the incremental build-up of resin composite restorations, their polymerization shrinkage during curing presents a serious problem. Indirect composite resin systems represent an alternative in overcoming
some of the deficiencies of direct composite restorations. The hypothesis of the present study states that the clinical performance of restorations may be affected by different generation and application techniques.
Study Design: Sixty restorations (20 DI system (Coltène/Whaledent AG, Altstätten, Switzerland) composite inlays, 20 Tescera ATL system (BISCO Inc. Schaumburg, Illinois, USA) composite inlays, and 20 direct composites) were applied to premolar teeth in 49 patients. Restorations were clinically evaluated by two examiners. Data
were analyzed using the Kruskal-Wallis, Mann-Whitney U, Wilcoxon Signed Ranks, and X2 tests.
Results: The Tescera ATL system performed significantly better than both direct composite restorations (p<0.001)
and DI system (p<0.05).
Conclusion: Within the limitations of this 3-year clinical study, indirect resin restorations showed better scores
than direct restorations. In addition, the Tescera ATL system was found to be more successful than the DI system
and direct composite restorations
Effects of ozone and photo-activated disinfection against Enterococcus faecalis biofilms in vitro
No full textObjectives: The purpose of this study was to compare the antibacterial effects of gaseous ozone (O3) and photo‑activated disinfection (PAD) methods against Enterococcus faecalis (E. faecalis) biofilms.Materials and Methods: Sixty‑five human mandibular premolars with straight root canals were selected. After root canal preparation, the samples were sterilized and placed into eppendorf tubes with 1 mL brain heart infusion broth containing 1.5 × 108 colony‑forming units (CFUs)/mL of E. faecalis. The contaminated samples were then divided into four groups (n = 15) according to the disinfection method used: Group 1, Saline (positive control); Group 2, NaOCl (negative control); Group 3, Gaseous O3; and Group 4, PAD. Three non‑contaminated teeth were used to control the infection and sterilization process. The CFUs were counted and the data were analyzed statistically.Results: There was a statistically significant difference between the experimental and control groups (P < 0.05). The saline group had the highest number of remaining microorganisms. Complete sterilization was achieved in the 2.5% NaOCl group. There were no statistically differences between PAD and gaseous O3 (P > 0.05).Conclusion: Both PAD and gaseous O3 have a significant antibacterial effect on infected root canals. However, 2.5% NaOCl was superior in terms of its antimicrobial abilities compared with the other disinfection procedures.Keywords: Biofilm, Ozone, Photo‑activated Disinfection, Root Canal Disinfectio
Effect of resin infiltration on enamel surface properties and Streptococcus mutans adhesion to artificial enamel lesions
No full textThe aim of this study was to evaluate and compare the effects of resin infiltration and sealant type on enamel surface properties and Streptococcus mutans adhesion to artificial enamel lesions. Artificial enamel lesions were produced on the surfaces of 120 enamel specimens, which were divided into two groups: Group A and Group B (n=60 per group). Each group was further divided into four subgroups (n=15 per subgroup) according to sealant type: Group I-Demineralized enamel (control); Group II-Enamel Pro Varnish; Group III-ExciTE F; and Group IV-Icon. In Group A, hardness and surface roughness were evaluated; in Group B, bacterial adhesion was evaluated. Icon application resulted in significantly lower surface roughness and higher hardness than the other subgroups in Group A. In Group B, Enamel Pro Varnish resulted in lowest bacterial adhesion, followed by Icon. This study showed that resin infiltration of enamel lesions could arrest lesion progress
Evaluation of 601 children with multisystem inflammatory syndrome (Turk MISC study)
No full textPurpose Due to its link with the 2019 coronavirus, the multisystem inflammatory syndrome in children (MISC) has garnered considerable international interest. The aim of this study, in which MISC patients were evaluated multicenter, and the data of the third period of the Turk-MISC study group, to compare the clinical and laboratory characteristics and outcomes of MISC patients who did and did not require admission to an intensive care unit (ICU).Methods This retrospective multicenter observational study was carried out between June 11, 2021, and January 01, 2022. The demographics, complaints, laboratory results, system involvements, and outcomes of the patients were documented.Results A total of 601 patients were enrolled; 157 patients (26.1%) required hospitalization in the intensive care unit (ICU). Median age was 8 years (interquartile range (IQR) 4.5-11.3 years. The proportion of Kawasaki disease-like features in the ICU group was significantly higher than in the non-ICU group (56.1% vs. 43.2% p = 0.006). The ICU group had considerably lower counts of both lymphocytes and platelets (lymphocyte count 900 vs. 1280 cells x mu L, platelet count 153 vs. 212 cells x 10(3)/ mu L, all for p< 0.001). C-reactive protein, procalcitonin, and ferritin levels were significantly higher in the ICU group (CRP 164 vs. 129 mg/L, procalcitonin 9.2 vs. 2.2 mu g/L, ferritin 644 vs. 334 mu g/L, all for p< 0.001). Being between ages 5-12 and older than 12 increased the likelihood of hospitalization in the ICU by four [95% confidence intervals (CI)1.971-8.627] and six times (95% CI 2.575-14.654), respectively, compared to being between the ages 0-5. A one-unit increase in log d-dimer (mu g/L) and log troponin (ng/L) was also demonstrated to increase the need for intensive care by 1.8 (95% CI 1.079-3.233) and 1.4 times (95% CI 1.133-1.789), respectively. Conclusion: By comparing this study to our other studies, we found that the median age of MISC patients has been rising. Patients requiring an ICU stay had considerably higher levels of procalcitonin, CRP, and ferritin but significantly lower levels of lymphocyte and thrombocyte. In particular, high levels of procalcitonin in the serum might serve as a valuable laboratory marker for anticipating the need for intensive care
Consideraciones clínicas y técnicas que contribuyen a la fractura de sistemas rotatorios utilizados en terapia endodóntica. Revisión sistemática 2015-2020
No full textEl objetivo principal de esta revisión fue establecer la evidencia en la literatura científica publicada entre 2015-2020, sobre condiciones clínicas y técnicas que contribuyen a la fractura de sistemas rotatorios durante la terapia endodóntica. Se realizó la búsqueda en las diferentes bases de datos como Google scholar, Scopus, Springer Link, Web Of Science, Dentistry Oral, Scielo, Embase, PubMed, y Science Direct en idioma inglés, utilizando las siguientes palabras claves: Preparación del conducto radicular, endodoncia, fractura, separación de lima, Glide Path, curvatura radicular, fatiga cíclica, fatiga torsional, reúso, experiencia del operador, limas rotatorias. A partir de éstas, se creó la estrategia de búsqueda y de acuerdo con los criterios de inclusión y exclusión establecidos, ochenta y nueve artículos fueron incluidos en la revisión sistemática. Las condiciones clinicas que contribuyen a la fractura de instrumentos son la fatiga cíclica y torsional, ángulo y radio de curvatura radicular, experiencia del operador, el reúso de instrumentos, la temperatura y las diferentes propiedades de los sistemas rotatorios. Fatiga cíclica fue la condición clínica con más reporte de separación de limas de NiTi en esta revisión, muchos factores afectan la resistencia de esta condición. Reciproc, Hyflex EDM, R- Pilot, Reciproc Blue, Wave One Gold, Protaper Next, Hyflex CM y Wave One son los sistemas rotatorios reportados con mejor resistencia a la fractura. Es importante conocer las propiedades de los diferentes sistemas para aplicar en cada caso, puesto que el riesgo de separación del instrumento dentro del conducto no se elimina, sino que se contribuye a minimizar. La anatomía del conducto radicular es el punto de partida en la selección de instrumentos rotatorios por sus variaciones complejas, principalmente la curvatura radicular. Los molares inferiores, molares y premolares superiores reportan un mayor riesgo de generar fractura de los sistemas rotatorios en endodoncia.The main objective of this review was to establish the evidence in the scientific literature published between 2015-2020, on clinical and technical conditions that contribute to rotational system fracture during endodontic therapy. The search was carried out in the different databases such as Google scholar, Scopus, Springer Link, Web Of Science, Dentistry Oral, Scielo, Embase, PubMed, and Science Direct in English, using the following keywords: Root canal preparation, Endodontics, Fracture, File Separation, Glide Path, Root Curvature, Cyclic Fatigue, Torsional Fatigue, Reuse, Operator Experience, Rotary Files. Based on these, the search strategy was created and, according to the established inclusion and exclusion criteria, eighty-nine articles were included in the systematic review. The clinical conditions that contribute to instrument fracture are cyclical and torsional fatigue, root angle and radius of curvature, operator experience, instrument reuse, temperature, and different properties of rotary systems. Cyclic fatigue was the clinical condition with the most reported NiTi file separation in this review, many factors affect the resistance of this condition. Reciproc, Hyflex EDM, R-Pilot, Reciproc Blue, Wave One Gold, Protaper Next, Hyflex CM and Wave One are the rotary systems reported with the best resistance to fracture. It is important to know the properties of the different systems to apply in each case, since the risk of separation of the instrument within the canal is not eliminated but rather helps to minimize it. The root canal anatomy is the starting point in the selection of rotary instruments due to its complex variations, mainly root curvatures. Lower molars, upper molars and premolars are reported as higher risk of fracturing rotary systems in endodontics.Especialista en Endodonciahttps://www.ustabuca.edu.co/Especializació
