Canal Transportation and Volumetric Dentin Removal Abilities of Ni-Ti Rotary File Systems in Curved Primary Root Canals: CBCT Study

Aylin İslam,Alaa Almashharawi,Gürkan Ünsal

doi:10.3390/app11199053

Abstract

Current improvements in nickel-titanium (Ni-Ti) rotary file systems have created a paradigm shift in the root canal therapy of primary teeth. Therefore, it is necessary to perform a comprehensive evaluation regarding the efficiencies of newly manufactured instruments for different parameters. The current study was conducted to evaluate the abilities of RaceEvo, R-Motion, ProTaper Gold (PTG) systems in curved primary root canals with regard to the patterns of canal transportation and volumetric dentin removal by using cone-beam computed tomography (CBCT). Two experimental sets were designed following the determination of experimental groups by using pre- and post-operative CBCT data: canal transportation and volumetric dentin removal. The highest amount of canal transportation was significantly detected in the PTG group in comparison to RaceEvo and R-Motion groups. When the mean values of volumetric dentin removal data were analyzed across all groups, the PTG group again exhibited the significantly highest value of dentin removal volumetrically, compared to RaceEvo, R-Motion and manual instrumentation groups. It is possible to state that R-Motion and RaceEvo rotary systems could be used as reliable alternatives without causing adverse mechanical effects and maintaining the original root canal anatomy of curved primary root canal systems compared with PTG rotary systems and manual instrumentation, with a high diagnostic sensitivity of CBCT in pediatric endodontics when the alternative methods are not adequate.

Highlights

The characteristics of primary molars with curved and shorter roots, ribbon-shaped morphology, and ectopic surface resorption, especially, must be taken into consideration during root canal therapy (RCT) [5]. Along with these challenging characteristics, the selection of a suitable instrument that can preserve the original shape of the root canal without creating any variations and providing regular dentin removal should be kept in mind published maps and institutional affiliations
The rotary file systems for endodontic treatment approaches were introduced in primary dentition by Barr and colleagues in 2000 to overcome these complex anatomical morphology and clinical errors [8]
When the mean values of volumetric dentin removal data were analyzed across all groups, the ProTaper Gold rotary system (2.015 ± 0.074) again exhibited the significantly highest value of dentin removal as compared, volumetrically, to the RaceEvo, R-Motion and Manual instrumentation groups (0.4629 ± 0.018; 0.4957 ± 0.018; 0.8427 ± 0.12, respectively/p = 0.000 for all comparisons), whereas no statistical difference was observed in the

Summary

Introduction

The characteristics of primary molars with curved and shorter roots, ribbon-shaped morphology, and ectopic surface resorption, especially, must be taken into consideration during RCT [5] Along with these challenging characteristics, the selection of a suitable instrument that can preserve the original shape of the root canal without creating any variations and providing regular dentin removal should be kept in mind published maps and institutional affiliations. Significantly minimized chair time for pediatric dental patients, no excessive dentinal tissue removal, and no canal transportation in curved canals were reported as the other major advantages of rotary systems [9,10].

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Results

Discussion

Conclusion