Comparison of cleaning Efficacy and Instrumentation Time between Rotary and Manual Instrumentation Techniques in Primary Teeth: An in vitro Study.

Objectives: The aim of this study was to compare the cleaningefficacy and instrumentation time between manual Hedstromfiles (H-files) and rotary Mtwo files in primary molar root canals.Materials and methods: A total of 90 primary root canals wereselected using standardized radiographs. The canals were injectedwith India ink with 30 gauge insulin syringe and dividedinto three groups. Group I-30 root canals instrumented withH-files, group II-30 root canals instrumented with Mtwo files,and group III-control group in which no canal instrumentationwas done. The teeth were cleared in various solutions andthen observed under a stereomicroscope.Results: No significant difference was seen in cleaningefficacy between H-files and Mtwo files in coronal, middle,and apical thirds of the root canal. The instrumentation timerecorded for H-files (3.41 ± 0.38 minutes) was significantly lessthan that of Mtwo files (4.81 ± 0.52).Conclusion: Although there was no significant difference incleaning capacity, further studies should be carried out usingthe single file systems.