Abstract
Objective: The aim of the present study was to compare the canal transportation, centering ratio, debris and smear layer score after using 3 rotary Ni-Ti systems, Revo-S (RS; Micro-Mega, Besancon Cedex, France) and ProTaper Next (PTN; Dentsply Tulsa Dental Specialties, Tulsa, OK) and M-Pro system( Guangdong, China, Mainland). Material and methods: Thirty nine mesiobuccal root canals of extracted lower first molars with 20˚ to 45˚ angle of curvature and were divided randomly into 3 groups of 13 samples each: group RS, group M-Pro and group PTN. Root canal transportation and centering ratio were evaluated at 3, 6 and 9 mm from apex using i-CAT CBCT (Hatfield, pennsylvania ,USA) before and after preparation.Thirteen Roots from each group were split longitudinally using diamond disc, by making a groove on buccal and lingual side of root without reaching the lumen of the canal.The root halves were examined under Scan Electron Microscope (SEM) by magnification x 1000 and x 4000 for debris and smear layer respectively The significance level was set at P ≤ 0.05. Results: There was no statistically significant difference in canal transportation, canal centering ratio, debris and smear layer score between the three tested groups. Conclusion: From the obtained results and within the limitations of this study, the following could be concluded:M-Pro Nickel Titanium rotary system had a negligible effect on root canal transportation which was similar to the ProTaper Next and Revo-S systems and no system was able to clean the root canal system completely.
Highlights
Root canal shaping and cleaning play a crucial role in the success of endodontic treatment
The root halves were examined under Scan Electron Microscope (SEM) by magnification x 1000 and x 4000 for debris and smear layer respectively at three different level
The main objective of root canal preparation is to achieve proper cleaning and shaping of the root canal system while maintaining the original canal curvature without altering its geometry [1, 18].To achieve this goal, many systems have been introduced to the market [19]
Summary
Root canal shaping and cleaning play a crucial role in the success of endodontic treatment. Its metallurgy is based on the M-wire alloy that is claimed to improve file flexibility and cyclic fatigue resistance.[5,6] While, Revo-S rotary system (Micro Mega, Besancon, France) has asymmetrical cross section which provides less stress on the instrument and increases the available volume for upward debris elimination. Thought it is made of austenitic alloy; the smaller section allows more flexibility and offers a better ability to negotiate curves [7,8]
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