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Öğe 3D Micro-CT Analysis of Void and Gap Formation in Curved Root Canals(NLM (Medline), 2017) Şımşek N.; Keleş A.; Ahmetoğlu F.; Akinci L.; Er K.Objective: This study used microcomputed tomography (micro-CT) to compare the volumes of voids and gaps in curved root canals instrumented and filled using various techniques. Methods: Twenty extracted mandibular first molars with two curved mesial root canals were used. Root canals were instrumented using a self-adjusting file (SAF) or Revo-S file system. For standardization, mesiobuccal canals were instrumented with SAF and mesiolingual canals were instrumented with Revo-S in each root. The canals were divided into four experimental groups (n=10 in each). The canals were then filled via cold lateral compaction (CLC) or a thermoplasticized injectable technique (TT) using gutta-percha and AH Plus root canal sealer. The roots were scanned with a micro-CT, and the volumes of the voids and gaps were calculated using three-dimensional (3D) micro-CT images. Data were analyzed using unpaired t- and Kruskal-Wallis tests. A value of P<0.05 was considered significant. Results: None of the tested techniques provided void- or gap-free fillings. Nevertheless, the SAF showed more gap formation than the Revo-S, and TT showed higher gap formation in all experimental groups. These differences, however, were not statistically significant (P>0.05). Conclusion: The SAF and Revo-S rotary file systems yielded comparable results. No statistically significant difference was found between the results of the various instrumentation and filling techniques. Copyright: © 2020 European Endodontic Journal.Öğe Endodontic treatment of a maxillary first molar having three mesiobuccal canals: A case report(Cumhuriyet University Faculty of Dentistry, 2015) Keleş A.; Yalçin M.Aim: The objective of this case report is to present a successful root canal treatment of a maxillary first molar having three mesiobuccal canals with separate orifices. Case presentation: An 18 year old female patient was admitted to our clinic, complaining from severe pain. We observed during the clinical examination that root canal treatment of the maxillary right first molar was already initiated. The tooth was percussion sensitive, cold and heat sensitive, although there was no referred pain. A broken endodontic instrument in the disto-buccal root canal was found during the radiographic examination. After extensive clinical and radiographic examination tooth was prepared for nonsurgical endodontic treatment. Starting the endodontic treatment, it was observed the presence of two canals orifices in the buccomesial root with no preparation. Though we failed to remove the fracture for the endodontic instrument, the instrument was bypassed. Root canals were obturated with guttapercha and sealer. The tooth was restored with composite resin. Conclusion: Recall examination as far as 6 months post-treatment found no sensitivity to percussion or palpation and recall radiography after treatment show no evidence of any periradicular lesion.Öğe Heat conduciton properties of flowable composite resins(Wolters Kluwer Medknow Publications, 2016) Yalçin M.; Keleş A.; Şişman R.; Karagöz S.Objectives: To investigate and compare heat conduction of different flowable composites. Materials and Methods: In this study, four different flowable composites; GC Gradia Direct LoFlo (GC Corporation, Tokyo, Japan), Filtek Ultimate (3M ESPE, St. Paul, USA), Grandio Flow (VOCO GmbH, Cuxhaven, Germany) and SDI Wave (SDI, Victoria, Australia) were used. Flowable composites were placed into standard molds and used according to manufacturer instructions. The samples were prepared for every brand of flowable composites. The Heat Conduction Unit's (P. A. Hilton Ltd., England) linear heat conduction module was used in determining the flowable composites heat conductivity. The data were statistically analyzed by Mann-Whitney U-test (SPSS 13.0, SPSS, Chicago, IL, USA). Results: Heat conduction values of flowable composites were found different each other. Results for GC Gradia Direct and Grandio Flow were significantly different from 3M ESPE and SDI (P < 0.05). However, result for 3M ESPE was and nonsignificant different from SDI (P > 0.005). Conclusions: Within the limits of this study, flowable composites transmit the heat. However, results for GC Gradia Direct and Grandio Flow were significantly different from 3M ESPE and SDI.
