The abilities of three Nickel‐Titanium mechanized systems to negotiate and shape MB2 canals in extracted maxillary first molars. A Micro‐Computed Tomographic study

Abstract

Aim

To evaluate the influence of three engine‐driven NiTi file systems manufactured with different NiTi alloys for the preparation of second mesiobuccal (MB2) canals in extracted maxillary first molars using a micro‐computed tomography scanner (Micro‐CT).

Methodology

Thirty maxillary molars with two canals in the mesiobuccal root were selected and randomly divided into 3 groups (n=10): Reciproc [REC; size 25, .08 taper; VDW, Munich, Germany], Prodesign R [PDR; size 25, .06 taper; Easy, Belo Horizonte, Brazil] and Mtwo [MO; size25, .06 taper; VDW, Munich, Germany]. Before and after root canal preparation of the MB2 canal, the teeth were scanned using a Micro‐CT to evaluate canal transportation, centering ability, dentine thickness and volume change. The working time to achieve working length was also evaluated. All parameters were compared statistically using the Kruskal‐Wallis and Dunn test for multiple comparisons, with a significance level of 5%.

Results

There was no significant difference among the groups regarding canal transportation and centering ability (P>0.05). However, the PDR size 25, .06 taper group had significantly lower canal volume and volume of dentine removal compared with a MO size 25, .06 taper and REC size 25, .06 taper (P<0.05). A root perforation was detected in MO size 25, .06 taper and REC size 25, .06 taper groups, respectively. Regarding the working time, the PDR size 25, .06 taper required a significantly longer time to achieve working length than MO size 25, .06 taper and REC size 25, .08 taper (P<0.05).

Conclusions

All NiTi systems had similar canal transportation, centering ability and increase of apical volume after preparation of MB2 canals. However, the PDR size 25, .06 taper had less volume of dentine removal, absence of root canal perforation and required a longer time to accomplish the root canal preparation.

This article is protected by copyright. All rights reserved.

https://ift.tt/2Lde1aU