Shaping ability and apical debris extrusion after root canal preparation with rotary or reciprocating instruments: a micro-CT study

ABSTRACT Introduction The study aimed to compare the shaping and preservation of the original curvature of simulated curved root canals using the following instruments: Reciproc (Rcp), WaveOne (Wo), and the ProTaper Next system (Ptn). Materials and methods A total of 45 resin blocks with simulated curved root canals were divided into three groups (n = 15), prepared using the Rcp (R25), Wo (25/0.8), and Ptn (X2) instruments. Standardized photographs were taken before and after canal instrumentation. After the superimposition of the images, the amount of resin removed from the curvature's inner and outer walls was measured at six apical levels, at intervals of 1 mm. The canals’ angles of curvature before and after instrumentation were subtracted. Results There were no significant differences between the instruments in terms of the total amount of resin removed of the inner or outer walls of the apical curvature (p > 0.05). The Rcp instruments provided the best resin removed ratios between the walls. The means of the change in angle were as follows: Wo = 2.15°, Ptn = 0.92°, and Rcp = 0.21°. WaveOne caused significantly higher deviations than Rcp. Conclusion All of the instruments demonstrated a tendency to straighten the simulated root canal. Instruments that use rotary movement achieved an effect similar to that of the reciprocating instruments in relation to change in angle. Clinical significance Deviations from the original shape of the root canal could have a negative impact on the quality of a filling and consequently on the success of the endodontic treatment. How to cite this article Maia Filho EM, dos Reis Santos RM, Lima DM, da Silva Pereira SM, Soares JA, de Jesus Tavarez RR, Ferreira MC, Carvalho CN, Bandeca MC, Tonetto MR, Borges AH, de Castro Rizzi C. Shaping Ability of ProTaper Next, WaveOne, and Reciproc in Simulated Root Canals. J Contemp Dent Pract 2016;17(11):902-906.

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Influence of voxel size on dentinal microcrack detection by micro-CT after root canal preparation

Brazilian Oral Research ◽

10.1590/1807-3107bor-2021.vol35.0074 ◽

2021 ◽

Vol 35 ◽

Author(s):

Jáder Camilo PINTO ◽

Hernán COAGUILA-LLERENA ◽

Fernanda Ferrari Esteves TORRES ◽

Éverton LUCAS-OLIVEIRA ◽

Tito José BONAGAMBA ◽

...

Keyword(s):

Root Canal ◽

Micro Ct ◽

Root Canal Preparation ◽

Voxel Size ◽

Microcrack Detection

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Comparative Evaluation of Dentinal Microcrack Formation before and after Root Canal Preparation using Rotary, Reciprocating and Adaptive Instruments at Different Working lengths - A Micro CT Study

Journal of Endodontics ◽

10.1016/j.joen.2021.05.004 ◽

2021 ◽

Author(s):

Arunima Aggarwal ◽

Ruchika Roongta Nawal ◽

Seema Yadav ◽

Sangeeta Talwar ◽

Sriram K ◽

...

Keyword(s):

Root Canal ◽

Comparative Evaluation ◽

Micro Ct ◽

Root Canal Preparation ◽

Before And After ◽

Microcrack Formation

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Occurence of dentinal defects after root canal preparation with R-phase, M-Wire and Gold Wire instruments: a micro-CT analysis

BMC Oral Health ◽

10.1186/s12903-017-0387-0 ◽

2017 ◽

Vol 17 (1) ◽

Cited By ~ 7

Author(s):

Marcely Cassimiro ◽

Kaline Romeiro ◽

Luciana Gominho ◽

Andressa de Almeida ◽

Larissa Costa ◽

...

Keyword(s):

Root Canal ◽

Gold Wire ◽

Micro Ct ◽

Root Canal Preparation ◽

Ct Analysis

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Influence of voxel size on micro-CT analysis of debris after root canal preparation

Brazilian Oral Research ◽

10.1590/1807-3107bor-2021.vol35.0008 ◽

2021 ◽

Vol 35 ◽

Author(s):

Jáder Camilo Pinto ◽

Fernanda Ferrari Esteves Torres ◽

Airton Oliveira Santos Junior ◽

Karina Ines Medina Carita Tavares ◽

Juliane Maria Guerreiro-Tanomaru ◽

...

Keyword(s):

Root Canal ◽

Micro Ct ◽

Root Canal Preparation ◽

Voxel Size ◽

Ct Analysis

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Presence of Metallic Microfragments on Dentinal Walls and Instrument Defects following Root Canal Preparation

The Journal of Contemporary Dental Practice ◽

10.5005/jp-journals-10024-2030 ◽

2017 ◽

Vol 18 (4) ◽

pp. 270-276

Author(s):

Carlos Estrela ◽

Daniel de A Decurcio ◽

Fernando B Barletta ◽

Caroline Solda ◽

Marina C Langaro ◽

...

Keyword(s):

Elemental Composition ◽

Root Canal ◽

Structural Defects ◽

Root Canal Preparation ◽

Root Canals ◽

Rotary Instruments ◽

Molar Teeth ◽

Reciprocating Instruments ◽

Reciprocating Systems ◽

Better Than

ABSTRACT Aim To determine the presence of metallic microfragments and their elemental composition in the dentinal walls of root canals following preparation using different endodontic instruments and to assess the active cutting edges of instruments with regard to structural defects. Materials and methods A total of 108 molar teeth were selected and prepared using different endodontic instruments. Teeth were randomly divided into nine groups of 12 teeth each, according to the instruments employed: Manual systems – K-FlexoFile, K-File, and Hedstroem; rotary systems – ProTaper Next, Mtwo, BioRaCe; and reciprocating systems – Reciproc, Unicone, and WaveOne. Both root canals and instruments were assessed using scanning electron microscopy, and the elemental composition of metallic microfragments was determined using energy-dispersive X-ray spectroscopy. Results Metallic microfragments were found in the groups prepared with both manual and reciprocating instruments, with no statistically significant differences between groups, thirds, or presence of metallic microfragments (p ≥ 0.05). Moreover, all groups presented structural defects in both new and used instruments; however, rotary instruments (ProTaper Next, Mtwo 702, BioRaCe) were the ones with the lowest number of defects, at statistically significant differences in comparison with other instruments (p < 0.05). Conclusion The presence of metallic microfragments on dentinal walls following root canal preparation was associated with manual and reciprocating instrumentation. Furthermore, rotary instruments were the ones with the lowest number of defects. Considering the outcomes measured in this study, rotary instruments performed better than the other two groups, as they were associated with the lowest number of metallic microfragments and structural defects. Clinical significance During root canal preparation, operative procedures may induce changes to the root canal shape, as well as the release of metallic fragments resulting from the action of instruments on dentinal walls. Therefore, it is important to determine, among the different techniques used for this purpose, which ones are least susceptible to this occurrence. How to cite this article Solda C, Langaro MC, Machado AN, Vanni JR, de A Decurcio D, Silva JA, Estrela C, Barletta FB. Presence of Metallic Microfragments on Dentinal Walls and Instrument Defects following Root Canal Preparation. J Contemp Dent Pract 2017;18(4):270-276.

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A microcomputed tomography evaluation of the shaping ability of three thermally-treated nickel-titanium rotary file systems in curved canals

Journal of International Medical Research ◽

10.1177/0300060518801451 ◽

2018 ◽

Vol 47 (1) ◽

pp. 325-334 ◽

Cited By ~ 2

Author(s):

Zhuwei Huang ◽

Jingjing Quan ◽

Jia Liu ◽

Wen Zhang ◽

Xiaolei Zhang ◽

...

Keyword(s):

Root Canal ◽

File Systems ◽

Microcomputed Tomography ◽

Nickel Titanium ◽

Root Canal Preparation ◽

Root Canals ◽

Before And After ◽

Shaping Ability ◽

Thermally Treated

Objective To evaluate the shaping ability of three thermally-treated rotary nickel-titanium (NiTi) systems including ProTaper Next (PTN), HyFlex™ CM (HFCM) and HyFlex™ EDM (HFEDM) during root canal preparation in simulated root canals. Methods A total of 45 simulated root canals were divided into three groups ( n = 15) and prepared with PTN, HFCM or HFEDM files up to size 25. Microcomputed tomography (microCT) was used to scan the specimens before and after instrumentation. Volume and diameter changes, transportations and centring ratios at 11 levels of the simulated root canals were measured and compared. Results HFEDM caused significantly greater volume increases than HFCM and PTN in the entire root canal and in the apical and middle thirds. HFCM removed the least amount of resin in the coronal third compared with HFEDM and PTN. Overall, HFCM caused significantly less transportation in the apical 2 mm and was better centred than PTN in the apical 3 mm. Conclusion Under the conditions of this study, all systems prepared curved canals without significant shaping errors and instrument fracture. PTN and HFCM cut less resin than HFEDM. HFCM stayed centred apically and cut the least material coronally.

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Post endodontic pain following single-visit root canal preparation with rotary vs reciprocating instruments: a meta-analysis of randomized clinical trials

BMC Oral Health ◽

10.1186/s12903-017-0355-8 ◽

2017 ◽

Vol 17 (1) ◽

Cited By ~ 12

Author(s):

Xiao-Mei Hou ◽

Zheng Su ◽

Ben-Xiang Hou

Keyword(s):

Clinical Trials ◽

Root Canal ◽

Randomized Clinical Trials ◽

Meta Analysis ◽

Root Canal Preparation ◽

Single Visit ◽

Reciprocating Instruments

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On the Causality Between Dentinal Defects and Root Canal Preparation: A Micro-CT Assessment

Brazilian Dental Journal ◽

10.1590/0103-6440201601002 ◽

2016 ◽

Vol 27 (6) ◽

pp. 664-669 ◽

Cited By ~ 20

Author(s):

Gustavo De-Deus ◽

Felipe Gonçalves Belladonna ◽

Juliana Roter Marins ◽

Emmanuel João Nogueira Leal Silva ◽

Aline de Almeida Neves ◽

...

Keyword(s):

Cross Section ◽

Root Canal ◽

Optical Microscope ◽

Control Group ◽

Micro Ct ◽

Micro Computed Tomography ◽

Root Canal Preparation ◽

Micro Cracks ◽

Before And After ◽

Experimental Group

Abstract This study aimed to evaluate the cause-effect relationship between canal preparation with ProTaper Universal (PTU) system and dentinal defects formation using micro-computed tomography (micro-CT) analysis. Forty mesial canals of mandibular molars with a type II Vertucci's canal configuration were scanned at an isotropic resolution of 14.16 µm. The sample was assigned to an experimental (n = 30) and a control (n = 10) groups, and the mesial canals were prepared with PTU system up to F2 instrument. The specimens from the experimental group were scanned and the cross-section images of the mesial roots, before and after preparation, were screened to identify the presence of dentinal defects. In the control group, the specimens were sectioned perpendicularly to the long axis of the root into 1-mm-thick slices (n = 80) and examined under optical microscope. Once a dentinal defect was detected, the slice was scanned through micro-CT. In the experimental group, dentinal micro-cracks were observed in 4,828 slices (24.04%). In all cross-section images, dentinal defects identified in the postoperative images were already present in the corresponding preoperative image. In the control group, 13 out of 80 slices (16.25%) had at least one dentinal defect visualized under stereomicroscopy, which was identified after a further micro-CT scanning. Micro-CT showed reliability as similar as optical microscopy in detecting dentinal defects, adding the possibility of tracking the dentinal tissue, before and after canal preparation, and providing a clear visualization of micro-cracks. Root canal preparation with PTU system did not induce the formation of new dentinal defects.

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