e-ISSN 2459-1726
Turkish Endodontic Journal (TEJ) - Turk Endod J: 6 (3)
Volume: 6  Issue: 3 - 2021
1.Cyclic fatigue resistance of WaveOne Gold Glider and TruNatomy Glider glide path instruments in double curvature canals
Damla Kırıcı, Öznur Güçlüer
doi: 10.14744/TEJ.2021.21931  Pages 67 - 70
Purpose: This study aims to compare the cyclic fatigue resistance of the WaveOne Gold Glider and TruNatomy Glider files in artificial double curvature canals.
Methods: This study includes 12 WaveOne Gold Glider (15.02 v) and 12 TruNatomy Glider (17.02 v) nickel–titanium files (Ni-Ti), which were all used according to the manufacturer’s instructions until they were broken in artificial double curvature canals. The artificial double curvature canals used in the study were made of stainless steel. The fracture time was recorded using a digital stopwatch. The rotation number until fracture was also calculated. Moreover, the lengths of the broken pieces were recorded. Data were statistically analyzed using an independent sample t-test.
Results: The number of rotations until fracture for the WaveOne Gold Glider file was noted to be higher when compared to that of the TruNatomy Glider file. Statistically significant difference was found between the two groups (p< 0.05). No statistically significant difference was determined between the two groups in terms of the lengths of the fragments (p> 0.05).
Conclusion: As per our findings, the resistance of the WaveOne Gold Glider Ni–Ti file to cyclic fatigue in double curved canals was found to be higher than that of the TruNatomy Glider Ni–Ti file.

2.Comparing the cyclic fatigue resistances of Reciproc Blue and Rotate instruments in simulated severe apical curvature
Özgür Soysal Özdemir, Defne Toplu
doi: 10.14744/TEJ.2021.33042  Pages 71 - 75
Purpose: This study primarily aims to evaluate the cyclic fatigue resistance of Reciproc Blue (VDW, Munich, Germany) and Rotate (VDW, Munich, Germany) instruments by testing them in a severe apical curvature at intracanal temperature.
Methods: In total, 12 Reciproc Blue (25.08) and Rotate (25.06) instruments were tested in a cyclic fatigue device at intracanal temperature (37°C). The instruments were tested in a stainless steel block with an artificial canal with a curvature angle of 90° and a radius of curvature of 2 mm. The instruments were operated until fracture occurred; then, the time for fracture (TF) was calculated. The length of the fractured tips was measured using a digital caliper. The data were analyzed using Student’s t-tests, with significance level set at p< 0.05.
Results: The TF values of Reciproc Blue (450.60 ± 34.36 s) were found to be significantly higher than Rotate (315.70 ± 70.89 s) (p< 0.05). Moreover, no significant difference was observed between the instruments as regards the length of the fractured fragments [Reciproc Blue: 3.11 ± 0.25 mm, Rotate: 2.97 ± 0.27 mm, (p> 0.05)].
Conclusion: Reciproc Blue displayed significantly higher cyclic fatigue resistance values than Rotate files when tested in the artificial canal with acute apical curvature.

3.Static cyclic fatigue resistance evaluation of Neoniti rotary files at different insertion angles
Afzal Ali, Nihat Umut Gözen, Abdurrahman Kerim Kul, Aasima Ishaq, Vivek Vadera
doi: 10.14744/TEJ.2021.48030  Pages 76 - 79
Purpose: Different insertion angles of the rotary files during the root canal shaping may influence the cyclic fatigue resistance (CFR). The present study aimed to evaluate the effects of different insertion angles on a file’s static CFR at body temperature.
Methods: Eighty new Neoniti (Neolix, Châtres-la-Forêt, France) 25 mm long files were used. The stainless-steel metal block had four artificial canals with different insertion angles (0°, 10°, 20°, and 30°). The files were subjected to a static cyclic fatigue procedure at simulated body temperature (36 ±  1). The number of cycles to failure (NCF) and fractured instrument length were recorded. The Kruskal–Wallis H test analyzed the data at a 95% confidence interval (p = 0.05).
Results: For #20.06 and #25.06 instrument, the 10°, 20°, and 30° insertion angles resulted in decreased static fatigue resistance as compared to straight (0°) insertion angle (p< 0.05).
Conclusion: When the insertion angle increases, the static CFR decreases. An inclined insertion into the canals decreased the CFR of the endodontic instruments.

4.Evaluating the apically extruded debris and irrigants in different nickel–titanium instrumentation and irrigation techniques
Bülent Yılmaz, Enver Sedat Küçükay
doi: 10.14744/TEJ.2021.05025  Pages 80 - 86
Purpose: This study aims to evaluate the amount of debris and irrigant extruded apically following the use of the ProFile.04/.06 with Orifice Shapers and HERO 642 rotary instrumentation systems and manual preparation using the modified step-down technique, in combination with irrigation by an anesthetic needle, perforated needle, or passive ultrasonic irrigation (PUI).
Methods: One hundred and eighty teeth with single canals and similar morphologies were included in this study. The teeth were then divided into nine groups. In each group, instrumentation and irrigation were performed using different methods. The extruded material was collected in preweighed vials and the amount of extruded debris was calculated. The data were analyzed using Kruskal–Wallis one-way analysis of variance and Dunn’s test.
Results: The amount of debris extruded apically was determined to be significantly higher with the step-down technique (p< 0.001) and ProFile system (p< 0.05) compared to the HERO 642 system. While the amount of irrigant extruded apically by perforated needle was higher than that by PUI (p< 0.01), compared to both methods, the anesthetic needle caused significant irrigant extrusion apically (p< 0.001). While a negative correlation was determined between the extruded irrigant and working length (p< 0.01), the irrigant was positively correlated with both minor (p< 0.01) and major foramen areas (p< 0.05) (n = 180).
Conclusion: HERO 642 and PUI yielded better results in terms of the parameters tested.

5.Determining the mental foramen location in a Turkish population: A cone beam computed tomography study
Sadullah Kaya, Gizem Akın Tartuk, Mehmet Eskibağlar, Merve Yeniçeri Özata, Seda Falakaloglu
doi: 10.14744/TEJ.2021.08208  Pages 87 - 91
Purpose: Mental foramen (MF) is defined as the gap generally located between the first and second premolars on the outer surface of the mandible. The well-defined MF location has been considered to be extremely important for dental procedures. Thus, this study primarily aims to identify the MF location among the Turkish population based on gender using cone beam computed tomography (CBCT).
Methods: In this study, sagittal, axial, and coronal CBCT images of 200 patients (120 males, 80 females) were retrospectively scanned, and the MF locations of the teeth were separately evaluated for the right and left mandible.
Results: As per the examined images, it was determined that the prevalence of MF between the first and second premolar teeth (right mandible: 47%, left mandibular: 52.5%, female: 49.4%, male 50%) is higher compared to other locations.
Conclusion: This CBCT study enabled the identification of the MF location for the Turkish population. This data can contribute to dental procedure applications, such as mental nerve anesthesia, endodontics, and implantology.

6.Aesthetic rehabilitation of complicated crown fractures in single visit: Case series
Yağmur Kılıç, Emrah Karataslioglu, Birkan Tatar, Onur Şahin, Mert Tulgar
doi: 10.14744/TEJ.2021.69775  Pages 92 - 96
Maxillary central incisors have been identified as the most frequently injured teeth due to trauma. Using tooth fragments combined with surgical extrusion offers advantages in terms of function and aesthetics while preserving the original morphology and position. This treatment modality increases the acceptability of the treatment and positively affects the patient’s psychology, as it is cost-effective and requires a shorter chair time. This case series primarily aims to present various cases treated by bonding fragments with recently introduced glass fiber posts or polyethylene fibers (Ribbond) in surgically extruded traumatized teeth.

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