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Shaping ability of P ro T aper NEXT and BT ‐ R a C e nickel–titanium instruments in severely curved root canals
Author(s) -
Bürklein S.,
Mathey D.,
Schäfer E.
Publication year - 2015
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/iej.12375
Subject(s) - instrumentation (computer programming) , nickel titanium , root canal , mathematics , dentistry , materials science , orthodontics , computer science , composite material , medicine , shape memory alloy , operating system
Aim To compare the shaping ability of four different nickel–titanium rotary instruments during the preparation of curved root canals in extracted teeth. Methodology A total of 80 root canals with curvatures ranging between 25° and 39° were divided into four groups of 20 canals. Based on radiographs taken prior to instrumentation, the groups were balanced with respect to the angle and the radius of canal curvature. Canals were prepared to a final apical size of 40 using M two, P ro T aper U niversal, P ro T aper NEXT and BT ‐ R a C e. Using pre‐ and post‐instrumentation radiographs, straightening of the canal curvatures and canal transportation were determined with a computer image analysis programme. Preparation time and instrument failures were also recorded. The data were analysed statistically using anova and S tudent– N ewman– K euls test. Results The use of BT ‐ R a C e files resulted in significantly more straightening during instrumentation compared to M two ( P < 0.05), whilst the differences between all other instruments were not significant ( P > 0.05). No significant differences were obtained between all four instruments regarding canal transportation ( P = 0.429). Instrumentation with P ro T aper NEXT files was significantly faster than with all other instruments ( P < 0.05). During the preparation of the curved canals, one BT 2 instrument fractured, whilst no fracture occurred when using the other instruments ( P > 0.05). Conclusions Within the parameters of this study, all instruments maintained root canal curvature well and were safe. However, care should be taken when using the BT 2 instrument due to its unique cylindrical design.