Cone-beam computed tomographic analysis of apical transportation and centering ratio of ProTaper and XP-endo Shaper NiTi rotary systems in curved canals: an in vitro study

Hamed Karkehabadi,Zeinab Siahvashi,Nasrin Haji Hasani,Abbas Shokri

doi:10.1186/s12903-021-01617-w

Hamed Karkehabadi, Zeinab Siahvashi + Show 2 more

Open Access

https://doi.org/10.1186/s12903-021-01617-w

Copy DOI

Abstract

BackgroundCleaning and shaping of the root canal system is an important step of endodontic treatment. Canal transportation is a common procedural error in preparation of curved canals. This study aimed to compare the canal transportation and centering ratio of two rotary files in curved canals using cone-beam computed tomography (CBCT).MethodsForty-four extracted human mandibular first molars with mature apices and 10° to 30° apical curvature were selected. The samples were randomly divided into two groups (n = 22) with similar curvature. The canals were prepared with ProTaper and XP-endo Shaper file systems according to the manufacturers’ instructions. The CBCT images were obtained using Cranex 3D CBCT scanner before and after root canal preparation, and canal transportation and centering ratio of the files at 3, 4 and 5 mm levels from the apex were calculated. Data were compared between the two groups using independent t-test at 0.05 level of significance.ResultsThe ProTaper Universal caused greater canal transportation and had lower centering ratio than XP-endo Shaper in both mesiodistal and buccolingual directions at all levels from the apex. The difference between the two groups regarding canal transportation was significant at all levels from the apex in buccolingual direction (P < 0.05) except for 3 mm from the apex (P > 0.05). The difference between the two groups regarding centering ratio was not significant (P > 0.05) in mesiodistal direction at all levels except for 4 mm from the apex (P < 0.05).ConclusionThe ProTaper Universal causes greater canal transportation in both buccolingual and mesiodistal directions than XP-endo Shaper.

Highlights

Cleaning and shaping of the root canal system is an important step of endodontic treatment
Root canal preparation of curved canals is more difficult, and the file has a higher tendency to deviate from the original canal path
Evidences show that rotary nickel titanium (NiTi) files better maintain the original canal path compared with stainless steel files

Summary

Introduction

Cleaning and shaping of the root canal system is an important step of endodontic treatment. Canal transportation is a common procedural error in preparation of curved canals. This study aimed to compare the canal transportation and centering ratio of two rotary files in curved canals using cone-beam computed tomography (CBCT ). Root canal cleaning and shaping is an important step of endodontic treatment [1]. Root canal preparation with hand and rotary files can cause procedural errors such as canal transportation, ledge formation, and zipping [2]. Root canal preparation of curved canals is more difficult, and the file has a higher tendency to deviate from the original canal path. Canal transportation is a common procedural error that occurs during preparation of Karkehabadi et al BMC Oral Health (2021) 21:277 curved canals. Evidences show that rotary nickel titanium (NiTi) files better maintain the original canal path compared with stainless steel files. Different rotary systems have been introduced on the market with unique designs in terms of tip, taper, pitch, rake, and helical angles [2]

Objectives

Methods

Results

Discussion

Conclusion