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Sarıyılmaz Ö, Sessiz R, Kocaman OS. The Impact of Coronal Flaring Files on Pericervical Dentin Thickness in Mandibular Molars. J Endod 2024; 50:514-519. [PMID: 38272441 DOI: 10.1016/j.joen.2024.01.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Revised: 01/11/2024] [Accepted: 01/12/2024] [Indexed: 01/27/2024]
Abstract
INTRODUCTION This study aimed to assess the influence of different coronal flaring files on dentin removal in mandibular teeth using cone-beam computed tomographic (CBCT) images. METHODS CBCT images of 48 mandibular molar teeth were acquired and randomly divided into 2 main groups, with each main group further divided into 3 subgroups. In the first main group, root canal preparation was performed using TruNatomy (Dentsply Sirona, Ballaigues, Switzerland), ProTaper Gold (Dentsply Sirona), and One Curve (Micro-Mega, Besancon, France) files without the use of coronal flaring files. In the second main group, root canal preparation was performed using the same files with the use of coronal flaring files. After the completion of root canal preparation, a second set of CBCT images was obtained. Subsequently, the dentin removal and remaining critical dentin were assessed by measuring at 4 distinct points below the furcation level. Data were compared between groups using the Mann-Whitney U and Kruskal-Wallis tests with alpha set at 5%. RESULTS The ProTaper Gold files demonstrated higher dentin removal compared with the TruNatomy files. In the no-flaring groups, the One Curve files exhibited greater dentin removal than the TruNatomy files at specific levels. The use of coronal flaring files generally did not significantly impact dentin removal, except for certain cases in the TruNatomy and ProTaper Gold groups. CONCLUSIONS The TruNatomy instrument group was more effective in preserving pericervical dentin compared with the other instrument groups. Coronal flaring files can be confidently used to preserve critical dentin during root canal treatment.
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Affiliation(s)
- Öznur Sarıyılmaz
- Faculty of Dentistry, Departments of Endodontics, Çanakkale Onsekiz Mart University, Çanakkale.
| | - Rüya Sessiz
- Faculty of Dentistry, Department of Dentomaxillofacial Radiology, Çanakkale Onsekiz Mart University, Çanakkale
| | - Osman Sefa Kocaman
- Ilgın Dr Vefa Tanir State Hospital, Turkish Republic Ministry of Health, Konya
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Sousa VCD, Alencar AHGD, Bueno MR, Decurcio DDA, Estrela CRA, Estrela C. Evaluation in the danger zone of mandibular molars after root canal preparation using novel CBCT software. Braz Oral Res 2022; 36:e038. [PMID: 35293503 DOI: 10.1590/1807-3107bor-2022.vol36.0038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Accepted: 10/11/2021] [Indexed: 11/22/2022] Open
Abstract
This study measured the thickness of cementum/dentin in the danger zone of the mandibular molars after root canal preparation using novel cone-beam computed tomography (CBCT) software. Eighty-four teeth were distributed into four groups: ProTaper Next, BioRace, Reciproc Blue, and WaveOne Gold. E-Vol DX® CBCT software was used to measure initial and final remaining cementum-dentin thicknesses after root canal preparation of the mesial root of mandibular molars at 1 and 3 mm from the furcation. The Kolmogorov-Smirnov test was used to test variable symmetry. The variables were described as mean and standard deviations, compared among the groups using analysis of variance (ANOVA), and within the groups using the Student t test. A generalized estimating equation model was used to compare the variation before and after root canal preparation. The level of significance was set at 5%. Differences between mean initial and final thicknesses of the mesiobuccal (MB) and mesiolingual (ML) canals were not statistically significant. The mean initial thickness was 3 mm (0.900 mm ± 0.191), considering that a mean lower than 1 mm (1.035 mm ± 0.184) indicates the danger zone. Although cementum/dentin is thinner at 3 mm from the furcation (0.715±0.186) after root canal preparation, the greatest amount of dentin removed was found at 1 mm (0.734 ± 0.191). The cementum-dentin remaining after preparation was thicker than 0.715 mm in root canals prepared using #35 (WaveOne Gold®) and #40 (ProTaper Next®, BioRace® and Reciproc Blue®) instruments. This confirms the safety of canal preparation in the danger zone using these systems.
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Affiliation(s)
- Vinícius Caixeta de Sousa
- Universidade Federal de Goiás - UFG, School of Dentistry, Department of Stomatology, Goiânia, GO, Brazil
| | | | - Mike Reis Bueno
- Faculdade São Leopoldo Mandic, School of Dentistry, Department of Radiology, Campinas, SP, Brazil
| | - Daniel de Almeida Decurcio
- Universidade Federal de Goiás - UFG, School of Dentistry, Department of Stomatology, Goiânia, GO, Brazil
| | | | - Carlos Estrela
- Universidade Federal de Goiás - UFG, School of Dentistry, Department of Stomatology, Goiânia, GO, Brazil
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Saritha V, Raghu H, Kumar TH, Totad S, Kamatagi L, Saraf PA. The accuracy of two electronic apex locators on effect of preflaring and file size: An in vitro study. J Conserv Dent 2021; 24:46-49. [PMID: 34475679 PMCID: PMC8378484 DOI: 10.4103/jcd.jcd_4_19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Revised: 06/04/2019] [Accepted: 01/19/2021] [Indexed: 11/18/2022] Open
Abstract
Aim: This study was conducted to evaluate the effect of preflaring and file size on the accuracy of the Root ZX and E-PEX Pro electronic apex locators (EALs). Materials and Methods: The actual working length was set 1 mm short of the apical foramen in the forty extracted mandibular premolars. The teeth were embedded in an alginate mold, and two examiners performed the electronic measurements using #10, #15, and #20 K-files. The files were inserted into the root canals until the “0.0” or “APEX” signals were observed on the light-emitting diode or display screens for the E-PEX Pro and Root ZX, respectively, retracting to the 1.0 mark. The measurements were repeated after the preflaring using the S1 and SX Pro-Taper instruments. The mean differences between the actual length and electronic length values were analyzed by the Wilcoxon signed-ranked test with a significance level of P < 0.05. The factors evaluated were “Accuracy of EALs,” “size of file,” and “presence of preflaring. Results: No significant differences were observed in the accuracy of both EALs when compared with the actual lengths. On the size of the file, significant difference noticed with #20 K-file. The preflaring procedure significantly (P < 0.05) increased the accuracy of the measurements for the Root ZX and Epex Pro. Conclusions: The tested EALs showed acceptable accuracy, whereas the preflaring procedure revealed a more significant effect than the used file size.
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Affiliation(s)
- V Saritha
- Department of Conservative Dentistry and Endodontics, PMNM Dental College and Hospital, Bagalkot, Karnataka, India
| | - H Raghu
- Department of Conservative Dentistry and Endodontics, PMNM Dental College and Hospital, Bagalkot, Karnataka, India
| | - Twino H Kumar
- Department of Conservative Dentistry and Endodontics, PMNM Dental College and Hospital, Bagalkot, Karnataka, India
| | - Shrishail Totad
- Department of Conservative Dentistry and Endodontics, PMNM Dental College and Hospital, Bagalkot, Karnataka, India
| | - Laxmikant Kamatagi
- Department of Conservative Dentistry and Endodontics, PMNM Dental College and Hospital, Bagalkot, Karnataka, India
| | - Prahlad A Saraf
- Department of Conservative Dentistry and Endodontics, PMNM Dental College and Hospital, Bagalkot, Karnataka, India
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Plotino G, Nagendrababu V, Bukiet F, Grande NM, Veettil SK, De-Deus G, Aly Ahmed HM. Influence of Negotiation, Glide Path, and Preflaring Procedures on Root Canal Shaping-Terminology, Basic Concepts, and a Systematic Review. J Endod 2020; 46:707-729. [PMID: 32334856 DOI: 10.1016/j.joen.2020.01.023] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Revised: 12/24/2019] [Accepted: 01/28/2020] [Indexed: 12/19/2022]
Abstract
INTRODUCTION Negotiation, glide path, and preflaring are essential steps in root canal shaping procedures. This report aimed to discuss the terminology, basic concepts, and clinical considerations of negotiation, glide path, and preflaring procedures and the influence of these steps on root canal shaping. METHODS This systematic review was undertaken following Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. The protocol has been registered with the International Prospective Register of Systematic Reviews (number CRD42019127021). A comprehensive literature search was performed by 2 independent reviewers using a selected search strategy in 2 electronic databases (PubMed and Scopus) until January 28, 2019. A further search was performed manually in endodontic journals. Studies investigating or comparing at least 1 shaping property resulting from root canal instrumentation with a glide path or preflaring in human extracted teeth or clinical studies were included. RESULTS The literature shows that the definition of glide path and preflaring procedures remains controversial, which requires an elaboration in the American Association of Endodontists' Glossary of Endodontic Terms. After the removal of irrelevant and duplicated articles, 98 articles were included. The impact of glide path preparation and preflaring on working length determination, apical file size determination, canal transportation, separation of endodontic files, shaping time, dentinal microcrack formation, and extrusion of debris was discussed. Because of heterogeneity among the included studies, quantitative synthesis was not performed for most of the parameters. CONCLUSIONS An evidence-based guideline is needed to define and correlate the basic concepts and current applications of each step of contemporary advancements in root canal instruments. Glide path preparation reduces the risk of debris extrusion, has no influence on the incidence of dentinal crack formation, and improves the preservation of the original canal anatomy. The creation of a glide path may have no impact on Reciproc files (VDW, Munich, Germany) in reaching the full working length. Preflaring increases the accuracy of working length determination. Further randomized clinical trials are required to evaluate the effect of a glide path and preflaring on root canal treatment outcomes.
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Affiliation(s)
| | - Venkateshbabu Nagendrababu
- Division of Clinical Dentistry, School of Dentistry, International Medical University, Kuala Lumpur, Malaysia
| | - Frederic Bukiet
- Aix Marseille University, CNRS, ISM, Inst Movement Sci, Marseille, France; APHM, Hôpital Timone, Service d'Odontologie, Marseille, France
| | | | - Sajesh K Veettil
- School of Pharmacy, International Medical University, Kuala Lumpur, Malaysia
| | - Gustavo De-Deus
- Department of Endodontics, School of Dentistry, Grande Rio University (UNIGRANRIO), Rio de Janeiro, Brazil
| | - Hany Mohamed Aly Ahmed
- Department of Restorative Dentistry, Faculty of Dentistry, University of Malaya, Kuala Lumpur, Malaysia.
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da Silva PB, Duarte SF, Alcalde MP, Duarte MAH, Vivan RR, da Rosa RA, Só MVR, do Nascimento AL. Influence of cervical preflaring and root canal preparation on the fracture resistance of endodontically treated teeth. BMC Oral Health 2020; 20:111. [PMID: 32299409 PMCID: PMC7161170 DOI: 10.1186/s12903-020-1050-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2019] [Accepted: 02/24/2020] [Indexed: 11/16/2022] Open
Abstract
Background Evaluate the fracture resistance of endodontically treated teeth after cervical preflaring and root canal preparation and to assess the volume of the root canal and the amount of remaining root dentin before and after cervical preflaring. Methods Forty-four mandibular incisors were selected using micro-CT scanning and distributed into 4 groups (n = 11) according to the instrument used for cervical preflaring: control group - no cervical preflaring; Gates Glidden – burs size #2 and #3; WXN – 25.07 Navigator instrument; and Easy – 25.08 ProDesign S instrument. Coronal opening was performed, and the canals were prepared with Wave One Gold Primary and filled with an epoxy-resin based sealer and gutta-percha cones. Micro-CT scans were performed before and after root canal instrumentation. All images were reconstructed and assessed for the thickness of mesial and distal root dentin at 3 mm and 5 mm from the cement -enamel junction and for the volume of cervical portion of the canal after preparation. Fracture resistance test was performed applying compressive loads at a crosshead speed of 0.5 mm/min, applied on the palatal aspect of specimens at 135° along the long axis of the tooth. The data were analyzed using ANOVA and Tukey’s test (P = .05). Results Cervical preflaring and canal preparation reduced the dentin thickness (P < .05) and increased the canal volume (P < .05) in all groups at 3 mm an 5 mm. Cervical preflaring with Gates Gliden burs reduced the fracture resistance of endodontically treated teeth (P < .05). Conclusions All instruments reduced the dentin thickness and increased the canal volume in the cervical at 3 mm and 5 mm. Gates Glidden reduced fracture resistance of mandibular incisors submitted to cervical preflaring, whereas NiTi instruments did not. Clinical relevance Cervical preflaring assumes particular importance previously to the root canal preparation because it minimizes the occurrence of operative accidents, and permits more accurate determination of working length and the apical diameter.
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Affiliation(s)
- Paula Barcellos da Silva
- Departamento de Odontologia Conservadora, Universidade Federal do Rio Grande do Sul, 2492 Ramiro Barcelos Street, Porto Alegre, RS, 90035-003, Brazil
| | - Simone Ferreti Duarte
- Departamento de Odontologia Conservadora, Universidade Federal do Rio Grande do Sul, 2492 Ramiro Barcelos Street, Porto Alegre, RS, 90035-003, Brazil
| | | | | | | | - Ricardo Abreu da Rosa
- Departamento de Odontologia Conservadora, Universidade Federal do Rio Grande do Sul, 2492 Ramiro Barcelos Street, Porto Alegre, RS, 90035-003, Brazil
| | - Marcus Vinícius Reis Só
- Departamento de Odontologia Conservadora, Universidade Federal do Rio Grande do Sul, 2492 Ramiro Barcelos Street, Porto Alegre, RS, 90035-003, Brazil.
| | - Angela Longo do Nascimento
- Departamento de Odontologia Conservadora, Universidade Federal do Rio Grande do Sul, 2492 Ramiro Barcelos Street, Porto Alegre, RS, 90035-003, Brazil
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Comparative analysis of root canal changes after preparation with three systems using Cone-Beam Computed Tomography. GIORNALE ITALIANO DI ENDODONZIA 2017. [DOI: 10.1016/j.gien.2017.04.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Xu J, He J, Yang Q, Huang D, Zhou X, Peters OA, Gao Y. Accuracy of Cone-beam Computed Tomography in Measuring Dentin Thickness and Its Potential of Predicting the Remaining Dentin Thickness after Removing Fractured Instruments. J Endod 2017; 43:1522-1527. [DOI: 10.1016/j.joen.2017.03.041] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2016] [Revised: 02/05/2017] [Accepted: 03/16/2017] [Indexed: 10/19/2022]
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Harandi A, Mohammadpour Maleki F, Moudi E, Ehsani M, Khafri S. CBCT Assessment of Root Dentine Removal by Gates-Glidden Drills and Two Engine-Driven Root Preparation Systems. IRANIAN ENDODONTIC JOURNAL 2017; 12:29-33. [PMID: 28179920 PMCID: PMC5282375 DOI: 10.22037/iej.2017.06] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Introduction: The aim of this study was to compare the dentine removing efficacy of Gates-Glidden drills with hand files, ProTaper and OneShape single-instrument system using cone-beam computed tomography (CBCT). Methods and Materials: A total of 39 extracted bifurcated maxillary first premolars were divided into 3 groups (n=13) and were prepared using either Gates-Glidden drills and hand instruments, ProTaper and OneShape systems. Pre- and post-instrumentation CBCT images were obtained. The dentin thickness of canals was measured at furcation, and 1 and 2 mm from the furcation area in buccal, palatal, mesial and distal walls. Data were analyzed using one-way ANOVA test. Tukey’s post hoc tests were used for two-by-two comparisons. Results: Gates-Glidden drills with hand files removed significantly more (P<0.001) dentine than the engine-driven systems in all canal walls (buccal, palatal, mesial and distal). There were no significant differences between OneShape and ProTaper rotary systems (P>0.05). Conclusion: The total cervical dentine removal during canal instrumentation was significantly less with engine-driven file systems compared to Gates-Glidden drills. There were no significant differences between residual dentine thicknesses left between the various canal walls.
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Affiliation(s)
- Azade Harandi
- Dental Material Research Center, Department of Endodontics, Dental School, Babol University of Medical Sciences, Babol, Iran
| | | | - Ehsan Moudi
- Dental Material Research Center, Department of Radiology, Dental School, Babol University of Medical Sciences, Babol, Iran
| | - Maryam Ehsani
- Dental Material Research Center, Department of Endodontics, Dental School, Babol University of Medical Sciences, Babol, Iran
| | - Soraya Khafri
- Department of Social Medicine and Health, Dental School, Babol University of Medical Sciences, Babol, Iran
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Olivier JG, García-Font M, Gonzalez-Sanchez JA, Roig-Cayon M, Durán-Sindreu F. Danger zone analysis using cone beam computed tomography after apical enlargement with K3 and K3XF in a manikin model. J Clin Exp Dent 2016; 8:e361-e367. [PMID: 27703602 PMCID: PMC5045681 DOI: 10.4317/jced.52523] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Accepted: 08/22/2015] [Indexed: 11/05/2022] Open
Abstract
BACKGROUND The objective of the study was to evaluate and compare how apical enlargement with K3 and K3XF nickel-titanium (NiTi) rotary instruments reduces the root thickness in the danger zone and affects canal transportation and centering ability in mandibular molar mesial canals in a manikin extracted tooth model. MATERIAL AND METHODS Seventy-two mesial root canals of first mandibular molars were instrumented. Initial and post-instrumentation Cone Beam Computed Tomography scans were performed after root canal preparation up to size 25, 30, 35 and 40 files. Canal transportation, canal centering and remaining root dentin thickness toward the danger zone were calculated in sections 1, 2 and 3 mm under the furcation level. Data were analyzed using non-parametric Kruskal-Wallis analysis of variance at a significance level of P < 0.05. RESULTS K3 instruments removed more dentin toward the danger zone compared with K3XF instruments (P< .05) and significant differences in dentin thickness were found when canal enlargement was performed to a #35-40 with both systems (P< 0.05). No significant differences in canal transportation and centering ability were found between systems, except when canal enlargement was performed to a #40 (P = 0,0136). No differences were observed when comparing the number of uses in both systems (P> 0.05). CONCLUSIONS Under the conditions of this study K3 removed a significant amount of dentin at the furcation level compared with the R-Phase K3XF rotary system in curved root canals. Enlargement to a 35-40/04 file removed significantly more dentin with both systems. Key words:K3, K3XF, R-phase, center ability, canal transportation, dentin thickness, increased apical enlargement, danger zone, dentin thickness.
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Affiliation(s)
- Juan-Gonzalo Olivier
- DDS, PhD. Department of Restorative Dentistry and Endodontics, Universitat Internacional de Catalunya
| | - Marc García-Font
- DDS, PhD. Department of Restorative Dentistry and Endodontics, Universitat Internacional de Catalunya
| | | | - Miguel Roig-Cayon
- MD, PhD. Department of Restorative Dentistry and Endodontics, Universitat Internacional de Catalunya
| | - Fernando Durán-Sindreu
- DDS, PhD. Department of Restorative Dentistry and Endodontics, Universitat Internacional de Catalunya
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Asgary S, Nikneshan S, Akbarzadeh-Bagheban A, Emadi N. Evaluation of diagnostic accuracy and dimensional measurements by using CBCT in mandibular first molars. J Clin Exp Dent 2016; 8:e1-8. [PMID: 26855697 PMCID: PMC4739359 DOI: 10.4317/jced.52570] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2015] [Accepted: 09/14/2015] [Indexed: 11/23/2022] Open
Abstract
Background This study aimed to assess the diagnostic accuracy of cone beam computed tomography (CBCT) and quantitatively evaluate the morphology of mandibular first molars using CBCT. Material and Methods Twenty-four double-rooted mandibular first molars were evaluated by NewTom VGi CBCT. The distance from the furcation and apex to the cementoenamel junction (CEJ), diameter and thickness of canal walls, the buccolingual (BL) to mesiodistal (MD) ratio (ΔD), prevalence of oval canals at different sections and taper of the canals were all determined. In order to assess the diagnostic accuracy of CBCT, distance from the furcation and apex to the CEJ and thickness of canal walls at the CEJ and apex were compared with the gold standard values (caliper and stereomicroscope). Statistical analyses were carried out using intraclass correlation coefficient (ICC), paired t-test and repeated measures ANOVA. Results A high correlation existed between the CBCT and gold standard measurements (P<0.001). In dimensional measurements, length of mesial root was higher than the distal root and lingual furcation was farther from the CEJ than the buccal furcation (P<0.001). An important finding of this study was the mesiodistal taper of the mesiobuccal (MB) and mesiolingual (ML) canals; which was equal to 0.02. Conclusions CBCT has acceptable diagnostic accuracy for measurement of canal wall thickness. Cleaning and shaping of the canals should be performed based on the unique anatomy of the respective canal; which necessitates the use of advanced imaging techniques for thorough assessment of root canal anatomy in a clinical setting. Key words:Permanent mandibular first molar, accuracy, cone-beam computed tomography, dimensional measurement.
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Affiliation(s)
- Saeed Asgary
- Iranian Center for Endodontic Research, Research Instituteof Dental Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Sima Nikneshan
- Department of Oral and Maxillofacial Radiology, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Alireza Akbarzadeh-Bagheban
- Iranian Center for Endodontic Research, Research Instituteof Dental Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Department of Basic Sciences, School of Rehabilitation Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Naghmeh Emadi
- Dental Research Center, Research Institute of Dental Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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Shantiaee Y, Dianat O, Paymanpour P, Nahvi G, Ketabi MA, Kolahi Ahari G. Alterations of the Danger Zone after Preparation of Curved Root Canals Using WaveOne with Reverse Rotation or Reciprocation Movements. IRANIAN ENDODONTIC JOURNAL 2015. [PMID: 26213536 PMCID: PMC4509121 DOI: 10.7508/iej.2015.03.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Introduction: The aim of this study was to compare the changes that occur in the danger zone (DZ) after preparation of curved mesiobuccal (MB) canals of mandibular first molars with WaveOne instruments in two different movements [reciprocation (RCP) and counter-clockwise rotation (CCWR)] by means of cone-beam computed tomography (CBCT). Methods and Materials: MB canals of 30 mandibular molars were randomly divided into 2 groups (n=15); WaveOne/RCP and WaveOne/CCWR. Pre- and post-instrumentation CBCT images were assessed for changes in the dentin thickness in DZ (2 and 4 mm below the highest point of the root furcation) in both groups. Data was analyzed using the repeated measures ANOVA test. Results: There was no statistically significant difference between two experimental groups in terms of remaining dentin thickness at 2 and 4 mm levels below the highest point of the furcation (P>0.05). Conclusion: The efficacy of WaveOne instrument on changes of the dentin thickness in the DZ was not affected by different file movements.
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Affiliation(s)
- Yazdan Shantiaee
- Iranian Center for Endodontic Research, Research Institute of Dental sciences, Department of Endodontics, Dental School , Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Omid Dianat
- Iranian Center for Endodontic Research, Research Institute of Dental sciences, Department of Endodontics, Dental School , Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Payam Paymanpour
- Iranian Center for Endodontic Research, Research Institute of Dental sciences, Department of Endodontics, Dental School , Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Golnaz Nahvi
- Dental Student, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mohammad Ali Ketabi
- Department of Endodontics, Dental School, Aja University of Medical Sciences, Tehran, Iran
| | - Golbarg Kolahi Ahari
- Endocrinology and Metabolism Research Center, Medical School, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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OLIVEIRA MAVC, VENÂNCIO JF, RAPOSO LHA, BARBOSA JÚNIOR N, BIFFI JCG. Morphometric evaluation and planning of anticurvature filing in roots of maxillary and mandibular molars. Braz Oral Res 2014; 29:1-9. [PMID: 25466326 DOI: 10.1590/1807-3107bor-2015.vol29.0012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2014] [Accepted: 08/27/2014] [Indexed: 11/21/2022] Open
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13
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Evaluation of Root Canal Transportation, Centering Ratio, and Remaining Dentin Thickness Associated with ProTaper Next Instruments with and without Glide Path. J Endod 2014; 40:2053-6. [DOI: 10.1016/j.joen.2014.09.001] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2014] [Revised: 08/28/2014] [Accepted: 09/01/2014] [Indexed: 11/18/2022]
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14
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Flores CB, Montagner F, Gomes BPFA, Dotto GN, da Silva Schmitz M. Comparative assessment of the effects of Gates-Glidden, Largo, LA-Axxess, and New Brazilian Drill CPdrill on coronal pre-enlargement: cone-beam computed tomographic analysis. J Endod 2013; 40:571-4. [PMID: 24666914 DOI: 10.1016/j.joen.2013.08.028] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2013] [Revised: 08/24/2013] [Accepted: 08/28/2013] [Indexed: 10/26/2022]
Abstract
INTRODUCTION The removal of dentin interferences from the cervical third of root canals is essential for their correct cleaning and shaping and to facilitate access of endodontic instruments to the critical apical region. In mandibular molars, the concavity observed in the furcation area reduces dentin thickness, making this region more susceptible to perforation. The present ex vivo study used cone-beam computed tomographic imaging to compare 3 rotary burs with a new rotary bur recently launched in Brazil (ie, CPdrill; Helse Industry and Commerce Ltda, Santa Rosa, São Paulo, Brazil) regarding the amount of dentin removal from the distal wall of the mesial root of mandibular first molars. METHODS A total of 40 root canals were selected and randomly divided into 4 groups for cervical preparation: Gates-Glidden burs #2 and #3 (Dentsply Maillefer, Ballaigues, Switzerland), Largo burs #1 and #2 (Dentsply Maillefer), LA-Axxess burs #1 and #2 (SybronEndo, Glendora, CA), and CPdrill burs (1-size only). Dentin thickness in the distal wall of mesial canals at 2 mm from the furcation was measured using I-CATvision software before and after cervical preparation. RESULTS There was no statistically significant difference between groups regarding residual dentin thickness after instrumentation with the drills (P = .684). CONCLUSIONS It was concluded that CPdrill is safe for use in cervical preparation of the mesial root of mandibular first molars because it did not promote excessive dentin removal on distal walls.
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Affiliation(s)
| | - Francisco Montagner
- Endodontic Division, Department of Conservative Dentistry, Federal University of Rio Grande do Sul, Rio Grande do Sul, Brazil
| | - Brenda P F A Gomes
- Endodontic Division, Piracicaba Dental School, State University of Campinas, Piracicaba, São Paulo, Brazil
| | - Gustavo Nogara Dotto
- Radiology Division, Department of Stomatology, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul, Brazil
| | - Marcia da Silva Schmitz
- Endodontic Division, Department of Stomatology, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul, Brazil
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15
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Brito-Júnior M, Camilo CC, Moreira-Júnior G, Pecora JD, Sousa-Neto MD. Effect of pre-flaring and file size on the accuracy of two electronic apex locators. J Appl Oral Sci 2013; 20:538-43. [PMID: 23138740 PMCID: PMC3881801 DOI: 10.1590/s1678-77572012000500008] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2012] [Accepted: 08/23/2012] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVE This ex vivo study evaluated the effect of pre-flaring and file size on the accuracy of the Root ZX and Novapex electronic apex locators (EALs). MATERIAL AND METHODS The actual working length (WL) was set 1 mm short of the apical foramen in the palatal root canals of 24 extracted maxillary molars. The teeth were embedded in an alginate mold, and two examiners performed the electronic measurements using #10, #15, and #20 K-files. The files were inserted into the root canals until the "0.0" or "APEX" signals were observed on the LED or display screens for the Novapex and Root ZX, respectively, retracting to the 1.0 mark. The measurements were repeated after the preflaring using the S1 and SX Pro-Taper instruments. Two measurements were performed for each condition and the means were used. Intra-class correlation coefficients (ICCs) were calculated to verify the intra- and inter-examiner agreement. The mean differences between the WL and electronic length values were analyzed by the three-way ANOVA test (p<0.05). RESULTS ICCs were high (>0.8) and the results demonstrated a similar accuracy for both EALs (p>0.05). Statistically significant accurate measurements were verified in the pre-flared canals, except for the Novapex using a #20 K-file. CONCLUSIONS The tested EALs showed acceptable accuracy, whereas the pre-flaring procedure revealed a more significant effect than the used file size.
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Affiliation(s)
- Manoel Brito-Júnior
- Inter-Institutional PhD Program, State University of Montes Claros, Montes Claros, MG, Brazil.
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16
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Marca C, Dummer PMH, Bryant S, Vier-Pelisser FV, Só MVR, Fontanella V, Dutra VD, de Figueiredo JAP. Three-rooted premolar analyzed by high-resolution and cone beam CT. Clin Oral Investig 2012; 17:1535-40. [PMID: 22993113 DOI: 10.1007/s00784-012-0839-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2012] [Accepted: 09/04/2012] [Indexed: 10/27/2022]
Abstract
OBJECTIVES The aim of this study was to analyze the variations in canal and root cross-sectional area in three-rooted maxillary premolars between high-resolution computed tomography (μCT) and cone beam computed tomography (CBCT). MATERIALS AND METHODS Sixteen extracted maxillary premolars with three distinct roots and fully formed apices were scanned using μCT and CBCT. Photoshop CS software was used to measure root and canal cross-sectional areas at the most cervical and the most apical points of each root third in images obtained using the two tomographic computed (CT) techniques, and at 30 root sections equidistant from both root ends using μCT images. Canal and root areas were compared between each method using the Student t test for paired samples and 95 % confidence intervals. RESULTS Images using μCT were sharper than those obtained using CBCT. There were statistically significant differences in mean area measurements of roots and canals between the μCT and CBCT techniques (P < 0.05). Root and canal areas had similar variations in cross-sectional μCT images and became proportionally smaller in a cervical to apical direction as the cementodentinal junction was approached, from where the area then increased apically. CONCLUSION Although variation was similar in the roots and canals under study, CBCT produced poorer image details than μCT. CLINICAL RELEVANCE Although CBCT is a strong diagnosis tool, it still needs improvement to provide accuracy in details of the root canal system, especially in cases with anatomical variations, such as the three-rooted maxillary premolars.
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Affiliation(s)
- Caroline Marca
- Department of Endodontics, Graduate Program, School of Dentistry, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Porto Alegre, Brazil.
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17
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Tyndall DA, Kohltfarber H. Application of cone beam volumetric tomography in endodontics. Aust Dent J 2012; 57 Suppl 1:72-81. [PMID: 22376099 DOI: 10.1111/j.1834-7819.2011.01654.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
In a 2008 article on cone beam volumetric tomography (CBVT) and dentoalveolar applications, Tyndall and Rathore wrote: 'It is in the area of endodontic applications that the literature has proved most fruitful to date.' This statement is even truer today than in 2008. A review of the literature has demonstrated that, in many cases, CBVT is more efficacious than traditional forms of 2-D imaging. Endodontic applications of CBVT include the diagnosis of periapical lesions due to pulpal inflammation, identification and localization of internal and external resorption, the detection of vertical root fractures, the visualization of accessory canals, and elucidation of the causes of non-healing endodontically treated teeth. Prior to 2008, most published articles on CBVT applications in endodontics were either case reports or in vitro studies. Since that time more well designed clinically related scholarly activity has been published. This article attempts to survey the field of CBVT applications in endodontics and provide the readers with an overview of what has been found. The authors hope that this knowledge will form a foundation for appropriate clinical decision making with specific reference to selection criteria for the endodontic applications of CBVT.
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Affiliation(s)
- Donald A Tyndall
- Division of Oral and Maxillofacial Radiology, Department of Diagnostic Sciences and General Dentistry, School of Dentistry, The University of North Carolina, North Carolina 27599-7450, USA.
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18
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Lim JS, Yoon HJ, Lee SH. Injury of submandibular gland and lingual nerve as complication third molar tooth extraction in mandible : a case report. J Korean Assoc Oral Maxillofac Surg 2011. [DOI: 10.5125/jkaoms.2011.37.2.137] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Affiliation(s)
- Jae-Sung Lim
- Department of Oral and Maxillofacial Surgery, Yeouido St. Mary's Hospital, The Catholic University of Korea, Seoul, Korea
| | - Hyun-Joong Yoon
- Department of Oral and Maxillofacial Surgery, Yeouido St. Mary's Hospital, The Catholic University of Korea, Seoul, Korea
| | - Sang-Hwa Lee
- Department of Oral and Maxillofacial Surgery, Yeouido St. Mary's Hospital, The Catholic University of Korea, Seoul, Korea
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