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Impact of different instruments metallurgy on Apical extrusion of debris and fracture resistance: A comparative invitro study

The purpose of this research was to compare apical debris extrusion and fracture resistance of teeth prepared with OneCurve, WaveOne Gold, or ProTaper Universal. Materials and Methods: Mandibular premolars were prepared with OneCurve, WaveOne Gold, or ProTaper Universal. In the experimental model, debris was recovered by apical section of the root washing with distilled water. The Eppendorf tubes were weighed after 15 days of storage to establish the overall weight of the tubes, including the extruded debris. The dry weight of the ejected material was then computed. After root canal obturation, the apical root ends were trapped in the acrylic up to 2 mm below the cementoenamel junction. The fracture force was calculated and given in Newtons. A one-way ANOVA test was used to compare more than two groups, followed by a Tukey post hoc test. The significance level was set at P≤ 0.05. Results: The results revealed a statistically significant difference in extruded debris between OneCurve, WaveOne Gold, and ProTaper Universal (P <0.05), as well as a statistically significant difference in the load required for vertical root fracture between the negative control and OneCurve, WaveOne Gold, and ProTaper Universal (P <0.05). Conclusion WaveOne Gold had the lowest weight value of debris extrusion, whereas ProTaper Universal had the most. Negative control had the highest load, followed by WaveOne gold and One Curve, and finally ProTaper Universal.