Introduction:Obtaining a correct working length is critical to the success of endodontic therapy. The aim of this clinical study was to compare the effect of working length determination using radiovisiography (RVG) and two-dimensional (2D) and three-dimensional (3D) measurements using cone-beam computed tomography (CBCT).Materials and Methods:Thirty mandibular teeth were taken and three groups of 10 each were made. Teeth with previous endodontic treatments, metal restorations, resorptions, incomplete apex formations, and multiple visible foramina were excluded. The root canal length was determined using RVG, CBCT measurement method 2D, and CBCT measurement method 3D. The difference between CBCT measurements, RVG, and the actual canal length were compared to evaluate the accuracy of each method.Results:No significant statistically difference was seen with 3D measurements and actual measurements. Measurements with RVG were better than CBCT 2D.Conclusion:Under experimental conditions, CBCT 3D measurements are accurate than RVG and CBCT 2D in the determination of root canal length.

Aim:In vitro study evaluation of the cyclic fatigue resistance of reciprocating and rotary single-file system [Wave One Gold (WOG), Reciproc, Hyflex electrical discharge machining (EDM) file systems] utilizing cyclic fatigue testing device. Materials and methods:Three nickel-titanium rotary systems (Hyflex EDM size #25, 0.06 taper and Reciproc and WOG size #25, 0.06 taper) were used in this study. Ten files were used in each file system, which are 25 mm long and tested with cyclic fatigue and torsional resistance tests.Results: Each file was tested in the simulated root canal until instrument fracture occurred. Hyflex EDM has high mean and standard deviation of 116.23 ± 4.41, followed by WOG (64.85 ± 3.34) and Reciproc (35.28 ± 2.32). Conclusion:Within the limitations of this study, Hyflex EDM exhibited the greater cyclic fatigue resistance when compared with other rotary and reciprocating files.

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Objectives: The purpose of this in vitro study was to evaluate the fracture resistance of endodontically treated teeth restored by glass fiber post and carbon fiber post systems. Materials and methods: About 40 maxillary canines with anatomically similar root segments were taken and then decoronated at the cementoenamel junction. After establishing the working length 1 mm short of the apex, the canal was prepared by the Crown Down technique using rotary protaper followed by obturation. After 24 hours, post space preparation was done using a Peeso reamer. All the specimens were then divided into two groups (group I: Glass fiber post; group II: Carbon post). The posts were then cemented into the tooth using a resin sealer, and acrylic resin cylinders were obtained using cylindrical molds. Specimens were subjected to increasing compressive load (N) until fracture. Results: There were statistically significant differences observed between the two groups, and it indicated that the glass posts have better fracture resistance capacity. Conclusion: Within the limitation of this study, it is concluded that the glass fiber posts have better fracture resistance as compared with carbon posts.