An In vitro Comparison between Endodontic Hand and Rotary Instruments in Root canal Preparations

Abstract

Objectives: This study aims to compare hand stainless steel K-files and Nickel titanium Profile 0.04 taper 29 series rotary instruments in root canal preparation on permanent premolars. For their efficiency in canals shaping with maintenance of original canal shape, procedural errors that occur during preparations of the canals or the instruments and time consumed in canals preparation by both methods. Materials and methods: About 46 freshly bilaterally extracted first premolars for orthodontic purpose were selected. They were further divided into two groups, each group comprise 23 teeth with sum of 34 canals, group I and group II. In group I teeth were prepared with hand stainless steel kfiles and group II were prepared with profile 0.4 taper series 29 rotary files. Impression material were introduced to the lumen of the prepared canals and the three dimensional shape of the prepared canals were assessed under magnification of stereomicroscope to assess the efficiency in preparing canals including canal smoothness, flow and taper. Results: results showed significantly shorter preparation time for Profile 0.04 taper than that of K-file. During canals preparations, about 8.8% of canals prepared with hand K-file showed canal blockage, change of working distance appeared in 23.5% of canals prepared with K-file and 11.7% in canals prepared with Profile. Failed instruments were significantly higher in K-files; the failure was in the form of deformation in most of cases. Profiles failed instruments were in the form of fracture and no deformation detected. 5 Both systems showed unsatisfactory quality of walls smoothness and flow. Good taper characteristic were highly significant in K-files preparations. Conclusion: Profile 0.04 rotary files prepared canals quicker than hand Kfiles and showed less instruments failures. Stainless steel K-file showed better results in regard to canals taper, suggesting the use of a technique that combines the two systems in canals preparation to overcome problems associated with each system