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    Comparison of shaping ability of two different rotary nickel-titanium preparation systems and two different hand preparation systems in curved root canals
    (Cumhuriyet University Faculty of Dentistry, 2010) Konanli, Melih; Timur Esener, I.; Akpinar, Kerem Engin; Kuştarci, Alper
    Purpose: The purpose of this study was to compare shaping ability of Quantec LX and Profile 29 rotary NiTi instruments and Nitiflex and stainless steel hand instruments in curved canals. Material and Methods: In this present study, mesial canals of 48 mandibular molar teeth possesing 25-40° of curvature angle were separated into 4 groups in a manner each group including 12 canals. The preparation groups were Nitiflex and H hand instruments, Profile 29 and Quantec LX rotary NiTi instruments. At the end of the study, changes of canal curvature and working lenght, instrument fractures and perforations were recorded. Data were analysed statistically using Wilcoxon, Kruskal-Wallis and Mann-Whitney U tests. Results: More changes of canal curvature and working lenght were observed in the rotary NiTi preparation systems than stainless steel files. In the stainless steel and Nitiflex files, no instrument fracture was found. Stainless steel files group was occured strip perforations, while rotary NiTi preparation systems were occured lateral preforations. Conclusion: In conclusion, rotary NiTi preparation systems were found to prepare curved root canals more effective than hand preparation systems.
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    Evaluation of the apical leakage amount of three different root canal filling techniques by dye penetration method
    (Gulhane Medical School, University of Health Sciences, 2012) Altunbaş, Demet; Kaya, Betül; Arslan, Dilara; Zan, Recai; Kuştarci, Alper; Akpinar, Kerem Engin
    The purpose of this study was to evaluate the apical leakage amount of the root canals filled with Thermafil technique, thermoplasticized injectable gutta-percha technique and lateral condensation technique by dye penetration method. In the study, 45 extracted human maxillary incisor teeth were used. After root canal cleaning and shaping, the teeth were divided into three groups of 15 teeth in each according to the technique of root canal filling: Group 1; lateral condensation technique, Group 2; Thermafil technique and Group 3; thermoplasticised injectable gutta-percha technique. After filling the roots, the root surfaces were coated with a double layer of nail varnish, except for the 2 mm part of the apical area, and immersed in Indian ink for 15 days. Dye penetration at the apical level was assessed with the clearing technique. Results of the study were evaluated statistically by using Kruskal-Wallis and Mann-Whitney U tests. There were no statistically significant differences between Group 1 and Group 3, and Group 2 and Group 3 (p>0.05), while a statistically significant difference was found between Group 1 and Group 2 (p<0.05). The mean apical leakage values were, from lower to higher, Group 2, Group 3 and Group 1, respectively. In conclusion the least leakage was observed with Thermafil technique with the use of dye penetration method. Therefore Thermafil technique can be regarded as an efficient filling system in achieving a successful endodontic therapy. © Gülhane Askeri Ti{dotless}p Akademisi 2012.