Results: The use of rotary files in primary teeth has several advantages when compared with manual K files: the efficiency in both, preparation time and root canal shape. 1. A decreased working time, that helps maintain patient cooperation by diminishing the potential for tiredness. 2. The shape of the root canal is more conical, favoring a higher quality of the root canal filling, and increasing clinical success.
Conclusion: Considering the short preparation time and transport canals for less rotary files, use these files for root canal teeth Pulpectomy process is recommended.