Volume Percentage of Filling Voids in Root Canals Prepared by a Novel Nickel-Titanium Rotary System (TruNatomy) Using Two Different Obturation Techniques.

You Jin Lee,Sunil Kim,Su-Jung Shin

doi:10.3390/ma14143846

Abstract

This study aimed to compare the volume percentage of filling voids in root canals prepared with a newly introduced rotary system, TruNatomy (Dentsply Maillefer), and obturated by the modified continuous wave (CW) or single cone (SC) filling technique. Plastic tooth models with four canals were enlarged by using TruNatomy files and randomly allocated into either the CW or SC group. The volume percentage of filling voids at 1–6 mm from the apex was analyzed by using microcomputed tomography; mean values were compared by using independent two-sample t-tests (p < 0.05). The mean volume percentages of the filling voids were 2.81 ± 1.11% and 1.77 ± 0.82% in the CW and SC groups, respectively. In the apical area (1–4 mm), volume percentages in the palatal were significantly different between the CW and SC groups; in the middle area (4–6 mm), volume percentages in the palatal and the second mesiobuccal canals were significantly different (p < 0.05). The SC group showed lower volume percentages of filling voids than the CW group. The canals prepared by the TruNatomy system can be obturated well by both the SC and CW techniques. The SC technique showed a lower number of voids, especially in the palatal canals.

Highlights

The microscopic images (20× magnification) of cross-sections at 3 and 6 mm from the apical tip revealed that both the single cone (SC) and continuous wave (CW) groups were well filled by the GP and sealer
The sealer portion of the SC group was greater than that of the CW group (Figure 1). Canals of both the SC and CW groups were well filled with GP and the sealer as per micro-CT images
GP filled most of the canal space, and the sealer constituted the remaining space in the CW group compared with that in the SC group

Summary

Introduction

Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Utilizing the concept of minimally invasive endodontics, TruNatomy (Dentsply Maillefer, Ballaigues, Switzerland) has been recently introduced as a new generation of rotary nickel–titanium (NiTi) file system designed to preserve the maximum amount of pericervical dentine with a continuously tapering preparation [1,2]. The files are made of a new wire that has super-elastic properties; the manufacturer claims that this file system can follow the natural shape of the canal [2]. The apical tip sizes of TruNatomy files are similar to those of the other commonly used NiTi file systems. The apical size of TruNatomy Prime Shaping file is 0.26, which is similar to that of ProTaper Gold

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