Several Shaping Characteristics of OneCurve Continuously Rotating System versus Three Different Kinematic Systems: ProTaper Universal, Twisted File Adaptive and WaveOne Gold

Objective: This study aimed to compare the curvature change, preparation time, resin removal amount and working length reduction properties of the OneCurve (0.25/0.06), ProTaper Universal F2 (0.25/0.06), Twisted File Adaptive SM2 (0.25/0.06) and WaveOne Gold Primary (0.25/0.07) using simulated root canal models. Materials and Methods: A total of 67 plastic models were used. Three models were used to verify the initial curvature angle, the weight of the unprepared resin block and the initial root canal length. The remaining 64 models were divided into four groups of 16 samples. After preparation, the changes in parameters were measured again. Statistical analysis was done with SPSS 22.0 using one-way ANOVA and post hoc Tukey's tests and Kruskal-Wallis with Bonferroni corrections. Pearson and Spearmen correlation coefficients were also used. A p-value <0.05 was significant. Results: Significant differences were observed between OneCurve, ProTaper Universal F2, Twisted File Adaptive SM2 and WaveOne Gold Primary file systems in terms of resin removal amount, root canal curvature change and preparation time (p<0.05). The correlations were statistically significant (p<0.05). Conclusions: Twisted File Adaptive SM2 performed significantly less resin removal and curvature change. Furthermore, the Twisted File Adaptive and WaveOne Gold Primary instruments required less preparation time compared with OneCurve and ProTaper Universal F2.