Evaluation of two shaping systems and two sonic irrigation devices in removing root canal filling material from distal roots of mandibular molars assessed by micro CT (original) (raw)
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Dentistry Journal, 2019
We assessed the efficiency of two shaping file systems and two passive ultrasonic irrigation (PUI) devices for removing filling material during retreatment. The mesial canals from 44 extracted mandibular molars were prepared and obturated. The teeth were randomly divided into two groups, and then one group was retreated with Reciproc R25 (VDW, Munich, Germany) (n = 44) and the other group was retreated with 2Shape (TS, Micro Mega, Besançon, France) (n = 44). A micro-computed tomography (CT) scan was taken before and after the retreatment to assess the volume of the filling material remnants. The teeth were then randomly divided into four groups to test two different PUI devices: Irrisafe (Satelec Acteon Group, Merignac, France) and Endo Ultra (Vista Dental Products, Racine, WI, USA). The teeth in Group A were retreated with 2Shape to test the Endo Ultra (n = 22) device, the teeth in Group B were retreated with 2Shape in order to test the Irrisafe (n = 22) device, the teeth in Group C were retreated with Reciproc to test the Endo Ultra (n = 22) device, and Group D was retreated with Reciproc to test the Irrisafe (n = 22) device. A third micro-CT scan was taken after the retreatment to test the PUIs. The percentage of Gutta-Percha (GP) and sealer removed was 94.75% for TS2 (p < 0.001) and 89.3% for R25 (p < 0.001). The PUI significantly enhanced the removal of the filling material by 0.76% for Group A (p < 0.001), 1.47% for Group B (p < 0.001), 2.61% for Group C (p < 0.001), and by 1.66% for Group D (p < 0.001). 2Shape was more effective at removing the GP and sealer during retreatment (p = 0.018). The supplementary approach with PUI significantly improved filling material removal, with no statistical difference between the four groups (p = 0.106).
Bioengineering
This study aimed to evaluate the effectiveness of the Endostar REvision system (Poldent, Warsaw, Poland) in the removal of filling materials from oval root canals using sonic irrigation as an additional cleaning method. Thirty human-extracted mandibular premolars with oval canals were prepared using the ProTaper Universal system (Dentsply Maillefer, Ballaigues, Switzerland) up to instrument F1 (20/.07), and then filled by the continuous wave vertical compaction technique using pulp canal sealer EWT (Sybron Dental Specialties, Orange, CA, USA). The teeth were randomly divided into two groups (n = 15) according to the instrumentation system and the additional cleaning method, as follows: REvision (30/.08, 25/.06) with EQ-S sonic activation (Meta Biomed, Chungcheongbuk-do, Korea), REvision (30/.08, 25/.06) without additional activation. All specimens were sectioned longitudinally at 3 and 7 mm from the apex, and analyzed using digital microscopy (KEYENCE, Osaka, Japan) to measure the t...
This study compared the efficacy of HyFlex NT (HF; Coltene, New York, NY) and Mani GPR (MN; Mani Inc, Tokyo, Japan) systems followed by a supplementary approach with passive ultrasonic irrigation (PUI) in removing the filling material from curved root canals during retreatment. The mesial canals from 20 extracted mandibular molars with Vertucci type IV configuration were instrumented and obturated (N = 40). Each mesial canal was retreated using either HF or MN instruments, alternating the system used per canal from root to root. The final preparation size was 40/0.04 for both systems. The volume of canal filling material was assessed by means of micro–computed tomographic (micro-CT) imaging before and after retreatment, and the working time was recorded. Canals still showing remnants of filling material were subjected to a supplementary approach with PUI, and another micro-CT scan was taken. The percentage of filling material removed with MN instruments and HF was similar (95.5% and 92.7%, respectively) (P > .05). MN required significantly less time to remove the filling material (P < .05). The supplementary approach with PUI significantly enhanced the removal of filling material (P < .05). Both systems were equally effective in removing the root canal filling during retreatment. MN was faster than HF. The supplementary approach with PUI significantly improved filling material removal. (J Endod 2018;44:299–303)
Revista de Odontologia da UNESP, 2016
Introduction The aim of endodontic retreatment is to remove the previous root filling materials completely to allow for the subsequent steps of cleaning, canal shaping and filling replacement. Objective To evaluate the efficacy of passive ultrasonic irrigation (PUI) in the removal of residual root filling material after removing the bulk of the root filling with nickel-titanium rotary instruments. Material and method Eighteen mesial isthmus-containing roots of human mandibular molars were prepared and filled. The root canal filling was removed with the ProTaper Retreatment system and K-files. The specimens were randomized into 2 groups (n = 9), both irrigated with 2.5% NaOCl and 17% EDTA. In the conventional group, an irrigation syringe was used. In the PUI group, the PUI technique was used. The roots were sectioned longitudinally and evaluated under stereomicroscopy. Student’s t test was used to compare groups and the general linear model was used to compare the apical, cervical, a...
Journal of Endodontics, 2019
Removal of accumulated hard-tissue debris (AHTD) by two ultrasonically-assisted and one multisonic irrigation systems was assessed with micro-computed tomography (micro-CT). Twenty-four extracted mandibular molars having two mesial canals connected by an isthmus and converging to a single foramen were selected. After preparation of the mesial canals with WaveOne Gold instruments (Dentsply Sirona Maillefer, Ballaigues, Switzerland), anatomically matched specimens were assigned to three final irrigation protocols (n=8): intermittent-ultrasonic (IU), continuous-ultrasonic (CU) and GentleWave (GW) system (Sonendo Inc, Laguna Hills, CA). Datasets of the micro-CT scans were co-registered and the percentage reduction of AHTD was statistically compared using one-way ANOVA and post-hoc Tukey tests with 5% significance level. Mean percentage reduction of AHTD in canals and isthmuses was significantly higher for GW (96.4% and 97.9%, respectively) than for CU (80.0% and 88.9%, respectively) (P<0.05). AHTD reduction for IU (91.2% and 93.5%, respectively) did not differ significantly from GW and CU (P>0.05).
Egyptian Dental Journal, 2021
Aim: To evaluate effectiveness of multiple rotary file systems on removal of the filling materials during retreatment of oval-shaped root canals. Methods: 40 oval root canals were instrumented with ProTaper Next to size X4 (40/.06). The canals were then allocated into two equal groups according to the final rinse, Group I: with Biopure MTAD, and Group II: with 17% EDTA. All the canals were later obturated with bioceramic based root canal sealer and gutta-percha using cold lateral compaction technique. According to the used retreatment rotary system, each group were further subdivided into two equal subgroups including subgroups Ia & IIa using D-Race (DR1) (30/.10) + XP-endo Shaper (XPS) (30/.04) + XP-endo Finisher R (XPFR), and subgroups Ib & IIb using R-Endo retreatment files up to R3 (25/.04) + Revo-S rotary files up to (40/.06). CBCT scans were used to calculate the remaining amount of root filling materials based on a certain threshold given to identify the density of dentin from that of the gutta percha at the pre scan (after obturation), and that of air at the post scan (after retreatment). The dentin volumes were also recorded at both scans to analyze the amount of remaining filling materials. Results: No significant differences were recorded regarding the amount of residual filling material with the tested systems (p > 0.05). Intra subgroups assessments showed more filling material removed when using a larger sized final instrument (p < 0.001). Conclusions: Tested file systems were evenly efficient in removing filling materials from ovalshaped root canals of extracted molars. Types of chelators used and bioceramic based sealer had no significant validity on effectiveness of removal of root canal filling material.
Journal of endodontics, 2015
A novel S-shaped rotary file was developed to conform to nonround canal cross sections. However, the instrument should also perform well in small curved canals. This study used micro-computed tomographic scans to test the effects of TRUShape (Dentsply Tulsa Dental Specialties, Tulsa, OK) and a conventional rotary on canal geometry. Twenty mandibular molars with independent mesial canals were submitted to preoperative micro-computed tomographic scans (20-μm resolution). Canals were randomly allocated to 2 groups using Vortex (Dentsply Tulsa Dental Specialties) and TRUShape for shaping according to the directions for use. Scans were obtained after size 20/.06 and 30/.06; the following outcome variables were calculated: dentin volume, smallest radicular wall thickness, treated canal surface, canal transportation, and accumulated hard tissue debris. The number of preparation errors was tabulated; data were statistically contrasted using repeated measures and factorial analyses of varian...
International Endodontic Journal, 2020
AimTo evaluate the use of a reduced taper endodontic instrument system (Bassi Logic™ .03 taper) and expandable heat‐treated system (XP‐endo Shaper) on the ability to shape canals in mandibular molars, by means of microcomputed tomography (micro‐CT) analysis. The Reciproc system was used as the reference for comparison.MethodologyTwenty‐four mandibular molars were scanned in a micro‐CT, matched based on similar anatomical features and sorted into three groups (n = 8 per group), according to root canal preparation system: Bassi Logic™ .03, XP‐endo Shaper and Reciproc. The teeth were mounted onto a mannequin and the pulp chambers were accessed with traditional access cavities. In Bassi Logic™ .03 and Reciproc groups, mesial canals were prepared with size 25, .03 taper or R25 (size 25, .08v taper) instruments and the distal root canal with size 25, .03 taper and size 40, .03 taper or R25 and R40 (size 40, .06v taper), respectively. In XP‐endo Shaper groups, all root canals were prepared...