Micro-computed Tomographic Assessment and Comparative Study of the Shaping Ability of 6 Nickel-Titanium Files: An In Vitro Study

María de Las Nieves Pérez Morales; José Antonio González Sánchez; Juan Gonzalo Olivieri; Firas Elmsmari; Phil Salmon; David E Jaramillo; Fernando Durán-Sindreu Terol

doi:10.1016/j.joen.2020.12.021

Micro-computed Tomographic Assessment and Comparative Study of the Shaping Ability of 6 Nickel-Titanium Files: An In Vitro Study

J Endod. 2021 May;47(5):812-819. doi: 10.1016/j.joen.2020.12.021. Epub 2021 Feb 4.

Authors

María de Las Nieves Pérez Morales¹, José Antonio González Sánchez², Juan Gonzalo Olivieri¹, Firas Elmsmari¹, Phil Salmon³, David E Jaramillo⁴, Fernando Durán-Sindreu Terol¹

Affiliations

¹ Departments of Endodontics and Dental Research, International University of Catalunya, School of Dentistry, Sant Cugat del Valles, Barcelona, Spain.
² Departments of Endodontics and Dental Research, International University of Catalunya, School of Dentistry, Sant Cugat del Valles, Barcelona, Spain. Electronic address: jagonzales@uic.es.
³ Bruker microCT, Kontich, Belgium.
⁴ Department of Endodontics, University of Texas Health Science Center at Houston, Houston, Texas.

PMID: 33549630
DOI: 10.1016/j.joen.2020.12.021

Abstract

Introduction: This research studies and compares the shaping ability of WaveOne Gold (WG; Dentsply Tulsa Dental Specialties, Tulsa, OK), the Reciproc Blue (RB; VDW, Munich, Germany), TRUShape (TS, Dentsply Tulsa Dental Specialties), XP-endo Shaper (XP; FKG, La Chaux-de-Fonds, Switzerland), iRace (IR, FKG), and TruNatomy (TN; Dentsply Sirona, Ballaigues, Switzerland) in the preparation of moderately curved canals and using micro-computed tomographic technology.

Methods: Sixty lower molars with 2 mesial canals were randomly distributed into 6 groups of 10 molars and 20 canals per group (n = 20). Specimens were scanned before and after preparation using the SkyScan 1275 (Bruker microCT, Kontich, Belgium). Group 1 was treated with WG, group 2 with RB, group 3 with TS, group 4 with XP, group 5 with IR, and group 6 with TN. After instrumentation, researchers quantified the changes produced in the canal geometry in terms of surface, volume, structure thickness, surface convexity index, structure model index, percentage of surface touched, and centroids. Wilcoxon and analysis of variance tests were performed to compare the values before and after preparation and the differences between groups. The significance level was established at 5%.

Results: There were no significant differences between WG and RB (P > .05) and between TN and XP (P > .05). TN had significant differences with WG, RB, TS, and IR (P < .05). All the files produced similar apical transportation (P > .05).

Conclusions: WG and RB and TN and XP had similar shaping effectivity. TS and WG touched the highest percentages of canal surfaces (81% and 73%, respectively) but produced the biggest changes in the canal anatomy. TN and XP better kept the canal anatomy, but TN touched the lowest percentage of canal surface (50%). All the files used were able to clean and to shape moderately curved canals with minimal apical transportation.

Keywords: Reciproc Blue; TRUShape; TruNatomy; Wave One Gold; XP-endo shaper; iRace.

MeSH terms

Belgium
Dental Pulp Cavity / diagnostic imaging
Equipment Design
Nickel*
Root Canal Preparation*
Titanium
X-Ray Microtomography

Substances

Nickel
Titanium