Comparison of Cleaning Efficacy of Different Rotary Files in Primary Teeth-An In vitro Study

Aim: The aim of the present study was to comparatively assess the cleansing efficiency of dissimilar rotary files in deciduous teeth. Materials and Methods: Forty-five deciduous anterior teeth that had been subjected to extraction were chosen for this research. The teeth were included if they had a minimum of 2/3rd undamaged root portions. Coronal entree was completed using round diamond burs. All 45 samples were allocated at random to one of the following three groups: Group I: Control group in which the radicular canal was not subjected to any form of instrumentation, Group II: The radicular canal was subjected to instrumentation employing rotary ProTaper files, Group III: The radicular canal was subjected to instrumentation with rotary MTwo files. The samples were subjected to immersion in a succession of diluted ethyl alcohols to permit dehydration: With a change of solution every eight hours, the first 16 hours were spent in 70% alcohol, followed by eight hours in 80% alcohol, eight hours in 95% alcohol, and eight hours in 100% alcohol. The samples thus subjected to dehydration were cleared by immersion in methyl salicylate for six hours. Under a stereomicroscope with a 10x magnification, the root canals were examined by a person who was blinded to the groups in order to look for any traces of ink in the coronal, middle, and apical third of the canals. Results: In the control group, greater residual remains were present in the apical 3rd at 2.16 +/- 0.08 followed by the coronal 3rd at 2.02 +/- 0.14, and then in the middle 3rd at 1.88 +/- 0.10. While using the ProTaper files, greater residual remains were present in the middle portion at 1.68 +/- 0.16, followed by the coronal third at 0.94 +/- 0.09, then the apical third at 0.98 +/- 0.22. Greater residual remains were again noted with the MTwo files in the mid-portion at 1.44 +/- 0.18, followed by the coronal part at 0.86 +/- 0.10 and then the apical part at 0.82 +/- 0.04. Differences among these groups were statistically significant with a P value < 0.001. Conclusion: The present study concluded that either of the file types used exhibited reasonably lower remnant score values in the apical third versus the middle/coronal thirds. Nonetheless, MTwo type files delineated superior capacity at removing debris versus the ProTaper file types at the apical level.