Comparative assessment of cleaning efficacy of two exclusive paediatric rotary files in root canals of primary teeth: An in vitro study

Background: Paediatric rotary file systems have recently been developed for primary teeth use.

Aim: To study the cleaning efficacies of two paediatric rotary endodontic files, the Prime Pedo^TM, and the Kedo-SG Blue^TM against the standard H files.

Design: This in vitro study included 54 freshly extracted primary molars, which were randomised into three groups (n = 18 each) and were prepared using either Kedo-SG Blue^TM, Prime Pedo^TM or hand H files after injecting methylene blue dye into the canals. Pre- and post-operative cone beam computerised tomography (CBCT) was performed to assess change in root canal volumes. Methylene blue dye removal from canals was assessed using stereomicroscopy, and canal cleanliness was examined by scanning electron microscopy (SEM).

Results: Both Prime Pedo^TM and Kedo-SG Blue^TM files reduced significantly less dentine when compared with conventional hand filing with Prime Pedo^TM removing the least amount of dentine. No significant difference was found in median SEM scores among the groups in the cervical, middle and apical thirds of the roots. Stereomicroscopic assessment of root canal cleanliness using dye removal technique shows a statistically significant difference existing between Kedo-SG Blue^TM and hand H files groups.

Conclusion: Prime Pedo^TM removed the least amount of dentine. Kedo-SG Blue^TM performed significantly better than conventional hand filing with H files when the root canal cleanliness was assessed.