Fitness of Gutta-percha Cones in Curved Root Canals Prepared with Reciprocating Files Correlated with Tug-back Sensation

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Introduction:The purpose of this study was to evaluate the gutta-percha–occupied area (GPOA) and the relationship between GPOA and tug-back sensations in canals instrumented with reciprocating files.Methods:Twenty curved canals were instrumented using Reciproc R25 (VDW, Munich, Germany) (group R) and WaveOne Primary (Dentsply Maillefer, Ballaigues, Switzerland) (group W), respectively (n = 10 each). The presence or absence of a tug-back sensation was decided for both of #25/.08 and #30/.06 cones in every canal. The percentage of GPOA at 1-, 2-, and 3-mm levels from the working length was calculated using micro–computed tomographic imaging. The correlation between the sum of the GPOA and the presence of a tug-back sensation was also investigated. The data were analyzed statistically at P = .05.Results:A tug-back sensation was present in 45% and 100% canals for #25/.08 and #30/.06 cones, respectively, with a significant difference (P < .05). At the 2- and 3-mm levels, #30/.06 cones produced significantly higher GPOA in groups R and W (P < .05). The sum of the GPOA score was significantly higher in the samples with a strong tug-back sensation (P < .05); however, there was no significant difference between the 2 cone types for this correlation (P > .05).Conclusions:Under the conditions of this study, the tug-back sensation can be a definitive determinant for indicating higher cone fitness in the curved canal regardless of the cone type.HighlightsThe tug-back sensation can be a definitive determinant for indicating higher cone fitness.There was no gutta-percha–occupied area (GPOA) difference between #25/.08 cones and #30/.06 cones at the 1-mm level.#30/.06 gutta-percha cones showed significantly higher GPOA scores than #25/.08 cones at the 2- and 3-mm levels.The sum of GPOA scores showed a strong correlation with the tug-back sensation.

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