Aim:The aim of this study is to compare the corono-apical sealing ability of three single-cone obturation systems using a glucose leakage model.Materials and Methods:A total of 90 extracted maxillary single rooted teeth were selected and their crowns were cut. The root canal of each sample was instrumented using a rotary crown down technique and then divided into four experimental (n = 20 each) and two control groups (n = 5 each). Samples in the experimental groups were filled as follows: Group 1, cold lateral condensation using Gutta-percha/AH Plus; Group 2, single-cone Gutta-percha and AH Plus; Group 3, single-cone Gutta-percha/and GuttaFlow2; Group 4, single-cone Resilon/RealSeal SE after 7 days, the sealing ability of root canal fillings was tested at different time intervals using glucose leakage model. Glucose leakage values were measured using a spectrophotometer and statistically analyzed.Results:The four experimental groups presented significantly different glucose leakage values at all test periods (P < 0.05). At the end of the observation period, the cumulative glucose leakage values of Groups 3 and 4 were significantly lower than those of Groups 1 and 2 (P < 0.05).Conclusion:Gutta-percha/GuttaFlow2 or Resilon/RealSeal SE combinations provided the superior sealing ability over the lateral condensation technique.

Aim of the Study:The aim of this study was to compare the apical sealing ability of two single-cone filling materials when sealed with different types of root canal sealers.Materials and Methods:Eighty extracted maxillary and mandibular canines were selected and their crowns were cut. The root canals were prepared using ProTaper Universal rotary system until size F4 and then divided into seven experimental groups (n = 10 each) and two control groups (n = 5 each). Samples of Groups 1, 2, and 3 were filled with single-cone gutta-percha and AH Plus, MTA Fillapex, and EndoSequence BC, respectively. Samples of Groups 4, 5, and 6 were filled similar to the previous groups with the exception of using a single-cone CPoint. Samples of Group 7 were filled with cold gutta-percha lateral condensation technique. To assess apical microleakage, the apical linear dye penetration was measured microscopically and data were statistically analyzed.Results:All experimental groups showed significantly different dye apical leakage values (P = 0.000). No significant differences were found between Groups 1, 2, 4, 6, and 7 (P < 0.05). The lowest mean leakage value was observed in Group 6 (0.95 ± 0.56 mm) while Groups 3 (2.68 ± 0.71 mm) and 5 (2.61 ± 0.71 mm) showed significantly higher mean leakage values.Conclusions:The lowest apical leakage value was observed with single-cone CPoint/EndoSequence BC but without significant differences when compared with single-cone gutta-percha/AH Plus, single-cone gutta-percha/MTA Fillapex, single-cone CPoint/AH Plus, and lateral condensation technique. Higher apical leakage values were observed with single-cone gutta-percha/EndoSequence BC and CPoint/MTA Fillapex.

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The aim of a successful root canal treatment is to clean and shape the root canal system to receive a three-dimensional impermeable filling. [1] Gutta-percha is the most common core material, which can be used with different types of root canal sealers and obturation techniques to fill the root canal system. [2] Warm vertical compaction is a commonly used obturation technique developed by Schilder in 1976. It could improve the adaptation of the obturation materials to the root canal walls and filling of lateral and accessory canals. [3] However, this technique requires a longer time and is difficult to apply. In an attempt to simplify the warm vertical condensation of gutta-percha, Buchanan suggested the continuous wave condensation technique using the System B heating device. [4] With the widespread use of rotary NiTi instruments, and the introduction of matched-taper gutta-percha or Resilon cones, the noncompaction matched taper single-cone obturation