Evaluation of rotary file system (Kedo-S-Square) in root canal preparation of primary anterior teeth using cone beam computed tomography (CBCT)-in vitro study

Rasha H Mohamed, Amina M Abdelrahman, Aly A Sharaf, Rasha H Mohamed, Amina M Abdelrahman, Aly A Sharaf

Abstract

Background: In recent years, pediatric endodontics has witnessed various advances including use of rotary files in pulpectomy. This study aimed to comparatively evaluate taper, amount of dentin removal and instrumentation time of the pediatric rotary Kedo-S Square file, hand K-files and H-files in primary canines using cone beam computed tomography (CBCT).

Methods: 60 primary canines were randomly assigned into three groups; A1 Kedo-S-Square rotary file (group I), hand stainless steel K file (group II) and hand stainless steel H file (group III). Teeth were mounted in vinyl poly siloxane impression material templates to be scanned before and after instrumentation by CBCT scans using Ondemand 3D software. Shaping ability of the files were evaluated in terms of taper of the canal and amount of dentin remaining of each group. Instrumentation time was recorded using a digital stopwatch.

Results: Kedo-S Square removed a significantly less amount of dentin in both apical (P < 0.002) and coronal thirds (P < 0.014). Taper of the preparations showed significant differences as Kedo-S Square file showed good taper in maximum number of root canals, while maual K- and H-files showed poor taper in maximum number of root canals (P < 0.0001). Rotary Kedo-S Square files required less instrumentation time (P < 0.0001).

Conclusion: The use of rotary Kedo-S Square files resulted in better conservation of tooth structure, superior tapering ability and least instrumentation time compared to hand K- and H-files.

Keywords: Cone-beam computed tomography; Hand H-files; Hand K-files; Kedo-S-Square rotary file; Primary teeth; Pulpectomy.

Conflict of interest statement

The authors declare no conflict of interest with respect to the authorship and/or publication of this article.

© 2022. The Author(s).

Figures

Fig. 1
Fig. 1
Tapering ability of Kedo-S Square file, K- and H-files
Fig. 2
Fig. 2
Pictorial representation showing sagittal cut of CBCT: a Pre- and Post-preparation CBCT scan images showing good taper with Kedo-S Square rotary file. b Pre- and Post-preparation CBCT scan images showing poor taper with manual K and H files
Fig. 3
Fig. 3
Mean residual dentin thickness (mm) following use of Kedo-S Square file, K- and H-files before and after instrumentation at different levels
Fig. 4
Fig. 4
Pictorial representation of axial cut of CBCT for Kedo-S Square, K- and H-file groups: a Pre-operative CBCT image of amount of dentin thickness at apical, middle and coronal thirds, b Post-operative CBCT image of amount of dentin thickness

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