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    Comparison of the efficacy of sonic irrigation and conventional syringe irrigation in the removal of curcumin and triple antibiotic paste from root canals
    (Tabriz University of Medical Sciences, 2021) Adigüzel, Mehmet; Yilmaz, Koray; Pamukçu, İsmail İlker
    Background. The present study aimed to compare the efficacy of sonic irrigation and conventional syringe irrigation (CSI) in terms of curcumin (CUR) and triple antibiotic paste (TAP) removal from a standardized groove artificially created in root canals. Methods. The root canals of 72 anterior maxillary teeth were prepared using the Reciproc system to size R50. The teeth were split longitudinally, and a standardized groove was created in the apical region of one root half. The standardized grooves were filled with CUR or TAP with the exclusion of six teeth that served as the negative control group, and then the root halves were reassembled. The teeth were divided into two subgroups according to the irrigation protocols used: sonic activation with EndoActivator (EA) or CSI (n = 15). After the removal of the medicament, the residual medicament was assessed under a stereomicroscope. Kruskal-Wallis and Mann-Whitney U tests were used for statistical analyses (P = 0.05). Results. The EA sonic activation method was significantly more efficient in removing CUR medicament from the root canals. Considering the medicament types, more CUR than TAP was removed from the root canals using both CSI and the EA (sonic activation) system (P < 0.05). Conclusion. As compared with CSI, the EA was not significantly more efficient in removing TAP, but it was significantly more effective than CSI in removing CUR. © 2021 The Author(s).
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    The Effect of Rotation Speed of XP-endo Shaper on Apically Extruded Debris During Endodontic Procedures: an In Vitro Study
    (Univ Costa Rica, Fac Odontologia, 2022) Yilmaz, Koray; Tufenkci, Pelin
    The aim of this study was to evaluate the effect of using a higher rotation speed with the XP-endo Shaper (XPS) on apically extruded debris and operation time during endodontic treatment and retreatment procedures. Sixty mesial roots of mandibular first molar teeth were randomly assigned to four groups (Initial treatment groups: XPS used at 1000 or 3000rpm rotation speeds and Retreatment groups: XPS used at 1000 or 3000rpm rotation speeds). During the initial treatment and retreatment procedures preweighed eppendorf tubes were used to collect apically extruded debris, and the operation time was recorded in seconds. The extruded debris was quantified by subtracting the preinstrumentation from the postinstrumentation weight of the Eppendorf tubes. Data were analysed using two-way ANOVA at a significance level of 0.05. In all groups, the use of the XPS at 1000 or 3000rpm rotation speeds had no statistically significant effect on the amount of apically extruded debris (p>0.05). The use of the XPS at a 3000rpm rotation speed significantly decreased the instrumentation time (p<0.05). In summary, the use of the XPS at high rotation speeds in initial treatment and retreatment procedures did not have a significant effect on the amount of apically extruded debris but significantly decreased the operation time.
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    Effect of Sodium Hypochlorite and EDTA on Surface Roughness of HyFlex CM and HyFlex EDM Files
    (Wiley, 2018) Uslu, Gulsah; Ozyurek, Taha; Yilmaz, Koray
    The aim of the present study was to compare the effect of exposure to sodium hypochlorite (NaOCl) and ethylenediaminetetraacetic acid (EDTA) on the surface topography and roughness of HyFlex controlled memory (CM) and HyFlex electrical discharge machining (EDM) using atomic force microscopy (AFM). Twenty HyFlex EDM (25/.08) and 20 HyFlex CM (25/.06) files were divided into five groups (n = 4). One group served as a negative control group. The files in the other groups were exposed to 5.25% NaOCl and 17% EDTA solutions at 37 degrees C for 5 and 10 min, respectively, and examined using AFM after each exposure. The data were analyzed using one-way ANOVA test. The lowest values were observed in the control group of HyFlex EDM files (p < .05). The highest values were observed in the HyFlex EDM and HyFlex CM files immersed in EDTA for 10 min (p < .05). In conclusion, the tested irrigants had a significant negative effect on the surface porosity of NiTi files. The immersion of NiTi files in irrigants during cleaning and sterilization procedures results in corrosion and surface deformation of the files, and this can lead to unexpected file fracture during clinical use. Thus, the investigation of effect of ethylenediaminetetraacetic acid (EDTA) and sodium hypochlorite (NaOCl) on surface topography of HyFlex files is important.
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    The Effects of Different Endodontic Access Cavity Design and Using XP-endo Finisher on the Reduction of Enterococcus faecalis in the Root Canal System
    (Elsevier Science Inc, 2020) Tufenkci, Pelin; Yilmaz, Koray
    Introduction: The aim of this study was to evaluate the effect of using the XP-endo Finisher (XPF; FKG Dentaire, La Chaux de Fonds, Switzerland) in teeth that have a traditional access cavity (TEC) and a contracted access cavity (CEC) design on the amount of decrease in the number of Enterococcus faecalis bacteria within the root canal system. Methods: Eighty mandibular first molar teeth were selected and randomly divided into 2 groups: TEC and CEC (n = 40/group). After access cavity preparation in the 2 groups, 80 mesiobuccal root canals were contaminated with Enterococcus faecalis for 4 weeks. After the first sampling (S1), in order to perform root canal instrumentation, the TEC and CEC groups were further divided into 4 subgroups (10 teeth/group): Reciproc (VDW GmbH, Munich, Germany) and ProTaper Next (Dentsply Maillefer, Ballaigues, Switzerland) with or without XPF. Bacterial sampling from the root canals was performed with sterile paper points before (S1) and after (S2) instrumentation to determine the bacterial load. The bacterial reduction was counted as colony-forming units/mL and analyzed statistically by 3-factor repeated measures analysis of variance. Multiple comparisons of the main factor effect were performed using the Bonferroni correction (alpha < .05), all at 5% significance. Results: The number of E. faecalis bacteria in all the samples with different cavity designs were significantly reduced after instrumentation. The lowest value of bacterial decrease percentage was observed in the CEC-Reciproc-XPF (82.8%) group. Conclusions: The bacterial reduction counts of E. faecalis were a similar level in the TEC and CEC cavities, and the use of XPF did not show significant differences between groups.
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    The effects of QMix and EndoActivator on postoperative pain in mandibular molars with nonvital pulps: a randomized clinical trial
    (Springer Heidelberg, 2019) Yilmaz, Koray; Tufenkci, Pelin; Adiguzel, Mehmet
    Aim The purpose of this study was to compare the effects of different irrigation solutions when used EndoActivator on postoperative pain. Methodology A total of 104 subjects with nonvital pulps were selected and randomly assigned to four experimental groups; (G) 1 (n = 26) 2.5% NaOCl + conventional endodontic syringe, (G) 2 (n = 26) 2.5% NaOCl + EndoActivator, (G) 3 (n = 26) 2.5% NaOCl + QMix + conventional endodontic syringe, (G) 4 (n = 26) 2.5% NaOCl + QMix + EndoActivator. All the patients were prescribed ibuprofen 400 mg to be taken every 8 h in case of pain. The patients were asked to rate the severity of the postoperative pain on a visual analog scale (VAS) for 8th, 24th, 48th, and 72nd hours after the visit. The data were analyzed using Kruskal-Wallis, Mann-Whitney U, and Chi-Square tests. Results G4 resulted in lesser postoperative pain levels on 8th, 24th, 48th, and 72nd hours than the G2, G3, and G1 did. There was no significant difference between G4 and G2 and between G3 and G1 in terms of the postoperative pain levels at any time interval (P > 0.05). Conclusion It was determined that the postoperative values of the groups, in which EA was used, were statistically significantly lower than in the other groups. The combined use of QMix and EA provided the most significant decrease in the postoperative pain values.
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    Fracture strength of endodontically treated teeth restored with different fiber post and core systems
    (Springer, 2020) Ozyurek, Taha; Topkara, Can; Kocak, Imran; Yilmaz, Koray; Gundogar, Mustafa; Uslu, Gulsah
    The aim of this study was to investigate the effects of different post and core systems, CAD/CAM crown placement on fracture strength of endodontically treated mandibular premolar teeth. One hundred forty single-rooted premolar teeth were randomly divided into a control group and six experimental groups as follows: control group (Group 1); FiberSite post luting with Clearfil DC Core Plus (Group 2); RelyX Fiber post luting and core build up with Clearfil DC Core Plus (Group 3); RelyX Fiber post luting with Clearfil DC Core Plus and core build up with Filtek Bulk Fill Posterior (Group 4); specimens that received CAD/CAM crowns after the same procedures performed in Groups 2, 3, and 4, respectively (Groups 5, 6, and 7). Fracture strength tests were performed, and the failure modes were recorded. Data were statistically analyzed using one-way ANOVA and post hoc Tukey tests. The highest fracture resistance was observed in the control group and among the experimental groups in Group 4. Groups 3 and 5 showed similar fracture resistance followed by Group 2. The lowest fracture resistances were seen in the samples of Groups 6 and 7. While the fracture strength of Group 2 increased after the crown placement (Group 5), the fracture strength of Group 3 and Group 4 decreased (P < 0.05). While the specimens in Groups 1, 2, 3, and 4 predominantly showed favorable failure, unfavorable failure was more frequent in Groups 5, 6, and 7.
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    Number of file usage on dentinal defect incidence of waveone gold and reciproc NiTi instruments
    (Cumhuriyet University Faculty of Dentistry, 2018) Özyürek, Taha; Yilmaz, Koray; Uslu, Gülşah
    Amaç: Kök kanal preperasyonu sirasinda Reciproc ve WaveOne GOLD NiTi kanal aletlerinin neden oldugu dentinal defekt vakalarini karsilastirmak ve ege kullanim sayisinin dentinal defekt insidansi üzerindeki etkisini incelemek. Materyal ve Metot: Iki yüz yetmis adet mandibular kesici dis çalismaya dahi edildi ve rastgele 3 gruba ayrildi. Negatif kontrol grubu (n = 30) herhangi bir islem yapilmadi, 120'şer diş de reciproc ve waveone gold gruplarina yerlestirildi. örneklerden apeksten 3, 6 ve 9 mm uzakta olucak sekilde yatay kesitler alindi ve light emitting diode lazer yardimi ile çekilen fotograflarda dentinal defekt varligi arastirildi. Bulgular: WaveOne GOLD, Reciproc ve control gruplari arasinda dentinal defect olusumu açisindan istatistiksel olarak anlamli bir fark yoktur. Resiproc egesinin 4. Kullanimi sonrasi apical bölgede olusturdugu dentinal defect sayisi WaveOne GOLD grubunun 1., 2. ve 3. Kullanimlari sonrasi olusan sayudan istatistiksel olarak anlamli derecede fazladir (p <, 05). Sonuç: çalismamizda test ettigimiz tüm NiTi egeler kök kanal dentininde defect olusumuna neden oldu ancak WaveOne GOLD, Reciproc ve kontrol grouplari arasinda toplam dentin defekti olusumu açisindan istatistiksel olarak anlamli bir fark bulunmadi. © Cumhuriyet University Faculty of Dentistry 2018.; Objectives: To compare the incidences of dentinal defects caused by Reciproc and WaveOne GOLD NiTi files during root canal preparation and to exam the effect of number of file usage on the incidence of dentinal defect. Materials and Methods: Two hundred seventy mandibular incisor teeth were randomly divided into 3 different groups as follows: negative control (no preparation performed) (n: 30), Reciproc (n: 120) and WaveOne GOLD (n: 120) groups. The specimens were sliced at 3, 6 and 9 mm from the apex. Microscopic pictures of the specimens were taken with the aid of light emitting diode and the dentinal defects were examined. Results: There was no statistically difference among the WaveOne GOLD, Reciproc and control groups in terms of dentinal defect formation. The number of dentinal defects occurred in apical region in Reciproc group following 4th use was found to be statistically higher than 1st, 2nd, and 3rd use in WaveOne GOLD group (p < .05). Conclusion: All the NiTi files tested in present study were found to cause defect in root canal dentin but there were not significant difference among the WaveOne GOLD, Reciproc and control groups in term of total dentinal defect formation. © Cumhuriyet University Faculty of Dentistry 2018.
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    Pull-out Retentive Resistance of Fiber Posts Restored with Different Core Materials
    (Galenos Publ House, 2022) Topkara, Can; Yilmaz, Koray; Gundogar, Mustafa; Uslu, Gulsah; Ozyurek, Taha
    Objective: This study aimed to assess the pull-out bonding resistance of FiberSite and RelyX Fiber posts constructed from core structures using various resin cement. Materials and Methods: Sixty mandibular premolar teeth were horizontally sectioned to create a root canal length of 15 +/- 1 mm. Up to size #40, samples were prepared and obturated with gutta-percha and root canal sealer. Three groups of specimens (n=20) were formed. FiberSite posts were luted and built-up using Clearfil DC Core Plus in Group 1, RelyX Fiber posts were luted and built-up using Clearfil DC Core Plus in Group 2, and RelyX Fiber Posts were luted and built-up using Filtek Bulk Fill Posterior in Group 3. Each specimen was vertically positioned in a universal testing machine and rotated at 0.5 mm/min until it dislodged. Oneway ANOVA and post hoc tests were used to evaluate the data. Results: The bonding strength of FiberSite posts was higher than that of RelyX Fiber posts (p<0.05). Clearfil DC Core Plus-built RelyX Fiber Posts exhibited higher bond strength than Filtek Bulk Fill Posterior-built posts (p<0.05). Conclusion: FiberSite posts provide better root canal dentin retention than RelyX Fiber posts with different core materials.