Microcomputed tomographic evaluation of 6 NiTi files on the pericervical dentin and the smallest dentin thickness zones in mesial root canals of mandibular molars: An in vitro study

Abstract

Objectives: The aim of this study was to evaluate six files on the pericervical dentin (PCD) and the smallest dentin thickness zones (SDTZ) in mesial root canals of mandibular molars. Materials and Methods: Sixty mesial roots with 2 canals were scanned before and after instrumentation with WaveOne Gold (WG), Reciproc Blue (RB), TRUShape (TS), XP-endo Shaper (XP), iRace (IR), and TruNatomy (TN). Surface, volume, structure thickness, SMI, and centroids were evaluated at the PCD, and the changes in the SDTZ were quantified. The data obtained werecompared using Wilcoxon and ANOVA with a 5% significance level. Results: XP and TN were similar in all the parameters (P >.05) at the PCD, but TN showed significant differences from WG, RB, TS, and IR (P <.05), while XP showed significant differences from WG (P <.05) in volume, surface, and structure thickness. Regarding the changes in the SDTZ, the amount of dentin removed was similar between the groups in both canals at the middle 1/3, at the cervical 1/3 for MB canals, and in ML canals for RB, TS, XP, IR, and TN (P>.05). The action of WG was significantly different from that of XP and TN in the cervical 1/3 of the ML canal (P <.05). Conclusions: XP and TN maintained better the anatomy, with minor changes at the PCD and SDTZ, while WG produced the largest changes. Centering at the PCD was maintained with all the files, and their performances were safe without risk of perforation. Clinical Relevance: The choice of endodontic files is a relevant factor in the conservative performance of root canal treatments. Trial Registration: No clinical trials were indicated in this study

Micro-Computed Tomographic Evaluation of the Shaping Ability of Vortex Blue and TruNatomyTM Ni-Ti Rotary Systems

“…The changes in root canal surface area and canal volume after preparation with both VB and TN groups were similar with no signi cant differences. TruNatomy showed no signi cant differences in the changes in canal area after instrumentation when compared to Vortex Blue, ProTaper Next, XP-Shaper [5,19,24]. Although signi cantly less changes in canal surface area were observed when TruNatomy was compared to WaveOne Gold, Reciproc Blue, TRUShape and iRace [19].…”

“…On the other hand, Vortex Blue les resulted in 55-58% of untouched canal surface area with a signi cant higher percentage when compared to XP-Shaper and TRUShape [21][22][23]. The previous studies showed higher percentage of untreated canal walls [19,20].…”

“…In the literature, TruNatomy les showed 50-52% of untouched canal surface area which had insigni cant difference when compared to Vortex Blue les [5], but signi cantly higher percentage compared to EdgeFile X3, XP-Shaper, WaveOne Gold, Reciproc Blue, TRUShape and iRace [8, 19,20]. On the other hand, Vortex Blue les resulted in 55-58% of untouched canal surface area with a signi cant higher percentage when compared to XP-Shaper and TRUShape [21][22][23].…”

“…TruNatomy showed no signi cant differences in the changes in canal area after instrumentation when compared to Vortex Blue, ProTaper Next, XP-Shaper [5,19,24]. Although signi cantly less changes in canal surface area were observed when TruNatomy was compared to WaveOne Gold, Reciproc Blue, TRUShape and iRace [19]. Vortex Blue les showed no signi cant difference in canal area after instrumentation when compared to TRUShape, but signi cantly less changes when compared to XP-Shaper [16,19].…”

“…Although signi cantly less changes in canal surface area were observed when TruNatomy was compared to WaveOne Gold, Reciproc Blue, TRUShape and iRace [19]. Vortex Blue les showed no signi cant difference in canal area after instrumentation when compared to TRUShape, but signi cantly less changes when compared to XP-Shaper [16,19]. Also, TruNatomy produced less volume changes when compared to XP-Shaper, WaveOne Gold, Reciproc Blue, TRUShape and iRace [19,20].…”