Canal Transportation and Centering Ability of WaveOne Gold in Combination with and without Different Glide Path Techniques

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The aim of this study was to compare centering ability and transportation values of the Primary WaveOne Gold (PWOG; Dentsply Sirona, Ballaigues, Switzerland) instrument with or without different glide path techniques. Centering ability and transportation were also compared between the 3 different glide path preparation groups.


The mesiobuccal canals of 60 extracted human mandibular molars (curvature angles between 25° and 35° and radii ≤10 mm) were selected and randomly divided into 4 groups with 15 canals each. Canals were negotiated to patency with a #8 K-file. Canal preparations were performed by a single operator using precurved #10, 15, and 20 stainless steel manual K-files (group KF); a #10 stainless steel manual K-file followed by PathFiles #1–3 (Dentsply Sirona) (group PF); a #10 stainless steel manual K-file followed by the WaveOne Gold Glider (Dentsply Sirona) (group WOGG); and no further glide path preparation (group NG). Micro–computed tomographic imaging was used to scan teeth before and after glide path preparation. The final canal preparation was performed with PWOG; after which, all 60 specimens were scanned again using micro–computed tomographic imaging. Canal transportation and centering ratio values were determined over levels 3 mm, 5 mm, and 7 mm from the root apex after glide path preparation and again after final preparation with PWOG. One-way analysis of variance was used to statistically compare groups. The significance level was set at P < .05.


No statistically significant difference in the mean centering ratios was found after glide path preparation when the KF, PF, and WOGG groups were compared (P > .05). The mean combined transportation values after glide path preparation were statistically significantly higher in the KF group compared with the PF and WOGG groups (P > .05). There was no statistically significant difference in the mean combined centering ratios or transportation values of the NG and 3 glide path groups in combination with PWOG over the 3 levels (P > .05).


KF group showed the highest mean transportation values during glide path preparation. However, the PWOG instrument's performance regarding centering ability and transportation was not influenced by the different glide path/no glide path preparation groups.

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