Transportation and Centering Ability of Neoniti and ProTaper Instruments; A CBCT Assessment.
BACKGROUND
Transportation is an important iatrogenic endodontic error which might cause failure. This study evaluated the canal transportation caused by Neoniti and ProTaper instruments, using cone-beam computed tomography (CBCT) cross sections.


METHODS
Thisin vitroexperimental study was performed on 40 mesiobuccal roots of maxillary first molars. The teeth were scanned with CBCT. They were randomly divided into 2 groups (n=20) that were prepared using either Neoniti or ProTaper files. An endodontist prepared the canal according to the manufacturer's guidelines. Prepared canals were re-scanned. The pre-instrumentation and post-instrumentation CBCT volumes were sectioned at 1 to 9-mm distances from the apex. The extent of canal dentine removal in mesial and distal directions were measured in each cross-section. Canal transportation and instrument centering ability were estimated based on the extents of root wall removal and were compared in both groups.


RESULTS
The groups were rather similar in terms of transportation and centering ability (P>0.05). However, canal preparation on mesial and distal walls was statistically significantly less in the Neoniti group, at most cross-sections. Transportation of both groups was not significantly different (P>0.05). Centering ability of both instruments was not significantly different (P>0.05).


CONCLUSIONS
Neoniti and ProTaper instruments might have proper centering ability and minimum transportations. Both instruments might cause similar extents of transportation and centering abilities.
Department of Endodontics, Dental School, Babol University of Medical Sciences, Babol, Iran.
Zahrasadat
Z
Madani
Department of Endodontics, Dental School, Babol University of Medical Sciences, Babol, Iran.
Ali
A
Soleymani
Endodontist, Babol Iran.
Tasnim
T
Bagheri
Department of Oral and Maxillofacial Radiology, Dental School, Babol university of Medical Sciences, Babol, Iran.
Ehsan
E
Moudi
Non-Communicable Pediatric Diseases Research Center, Babol University of Medical Sciences, Babol, Iran.
Ali
A
Bijani
Department of Dental Anatomy, Dental School, Azad University of Medical Sciences, Tehran, Iran.
Vahid
V
Rakhshan
Centering Ability; Nickel Titanium Instruments; Root Canal Preparation; Root Canal Treatment; Transportation