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Eren İ, Sezer B. Comparison of the Effects of WaveOne Gold, TruNatomy, and Conventional Hand Files on Remaining Dentin Volume in the Coronal Part of the Root and Preparation Efficiency in Mandibular Molars. J Endod 2023:S0099-2399(23)00292-3. [PMID: 37269976 DOI: 10.1016/j.joen.2023.05.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 05/29/2023] [Accepted: 05/29/2023] [Indexed: 06/05/2023]
Abstract
INTRODUCTION The use of file systems that work with different principles in root canal treatment is becoming widespread. The aim of this study was to evaluate the remaining dentine volume in the coronal region of the root and preparation efficiency after the use of conventional hand files, WaveOne Gold, which works with reciprocating motion, and TruNatomy, which works with rotational motion, in the root canal treatment of mandibular molar teeth. METHODS All canals of permanent mandibular molars (n = 36) were used. Root canals in each group (n = 12) were prepared with conventional hand files, WaveOne Gold, and TruNatomy. The three-dimensional images were evaluated for remaining dentine volume in the coronal two-millimeter region of the root and change in volume of the entire root canal space. RESULTS There was no statistically significant difference between the groups in terms of mean differences pre- and post-preparation (P >.05). The mean differences after preparation were observed the most in the WaveOne Gold group and the least in the TruNatomy group in the coronal two-millimeter region of the root and entire canal volume, but the differences were not significant (P>.05,P>.05, respectively). CONCLUSIONS Conventional hand files, WaveOne Gold working with reciprocating motion, and TruNatomy working with rotational motion, which are the file systems used in the study, are not superior to each other in terms of remaining dentin volume in the coronal two-millimeter region of the root and preparation efficiency in the entire root canal space in mandibular molars.
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Affiliation(s)
| | - Berkant Sezer
- Department of Pediatric Dentistry, School of Dentistry, Çanakkale Onsekiz Mart University, Çanakkale, Türkiye.
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Haupt F, Dullin C, Krebs M, Hettwer-Steeger I, Kanzow P, Rödig T. Micro-CT evaluation of frozen and embalmed human cadavers on the effect of root canal preparation on microcrack formation in old dentin. PLoS One 2023; 18:e0281124. [PMID: 36716302 PMCID: PMC9886256 DOI: 10.1371/journal.pone.0281124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2022] [Accepted: 01/13/2023] [Indexed: 02/01/2023] Open
Abstract
The aim of this study was to evaluate the existence of preoperative dentinal defects among differently preserved dentoalveolar bone-blocks (frozen vs. embalmed) and to investigate the effect of varying apical forces (low: <4 N, high: 4-8 N) during root canal preparation on microcrack formation using micro-computed tomography (micro-CT). Thirteen embalmed and seven frozen bone-blocks containing 1-3 single rooted teeth were collected. The teeth were evenly divided into three groups (n = 10): FLow (frozen, <4 N), ELow (embalmed, <4 N), EHigh (embalmed, 4-8 N). After working length determination all specimens were scanned preoperatively. Root canal preparation was performed using nickel-titanium instruments sizes 25/.06 and 40/.06 (F6 SkyTaper; Komet, Lemgo, Germany). A postoperative scan was performed and image stacks were co-registered. All cross-sectional images were screened to identify the presence of dentinal defects. The results were expressed as the percentage of teeth/slices presenting dentinal defects. The statistical analyses were performed with Kruskal-Wallis-Test and Mann-Whitney-U-Test (α = 5%). Embalmed specimens presented a significantly higher percentage of slices with preoperative microcracks (p<0.05) than frozen specimens. No significant difference between groups was observed regarding the induction of microcracks (p>0.05). Root canal preparation does not induce microcracks in dentoalveolar bone-blocks from donors of old age, irrespective of the preservation method and the apically directed forces.
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Affiliation(s)
- Franziska Haupt
- Department of Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Göttingen, Germany
- * E-mail:
| | - Christian Dullin
- Department of Diagnostic and Interventional Radiology, University Medical Center Göttingen, Göttingen, Germany
| | - Marcel Krebs
- Department of Pathology, University Medical Center Göttingen, Göttingen, Germany
| | | | - Philipp Kanzow
- Department of Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Göttingen, Germany
| | - Tina Rödig
- Department of Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Göttingen, Germany
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Wan B, Chung BH, Zhang MR, Kim SA, Swain M, Peters OA, Krishnan U, Moule A. The effect of varying occlusal loading conditions on stress distribution in roots of sound and instrumented molar teeth. A finite element analysis. J Endod 2022; 48:893-901. [DOI: 10.1016/j.joen.2022.03.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Revised: 03/28/2022] [Accepted: 03/29/2022] [Indexed: 11/29/2022]
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Bhargava K, Newase P, Paunikar M, Bhawalkar A, Kumar T, Sarode G. Comparative evaluation of the effect of hand file, different nickel-titanium retreatment files, and self-adjusting file system on the incidence of dentinal microcrack formation during the removal of root canal filling material: An in vitro stereomicroscopic study. MEDICAL JOURNAL OF DR. D.Y. PATIL VIDYAPEETH 2022. [DOI: 10.4103/mjdrdypu.mjdrdypu_328_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Haupt F, Riggers I, Konietschke F, Rödig T. Effectiveness of different fiber post removal techniques and their influence on dentinal microcrack formation. Clin Oral Investig 2021; 26:3679-3685. [PMID: 34893941 PMCID: PMC8979865 DOI: 10.1007/s00784-021-04338-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2021] [Accepted: 12/06/2021] [Indexed: 10/31/2022]
Abstract
OBJECTIVES The aim of this study was to evaluate the effectiveness of different fiber post removal techniques and to correlate dentinal loss with microcrack formation. MATERIALS AND METHODS Forty-five extracted single-rooted teeth were root canal treated and fiber posts were adhesively luted. Specimens were divided into three groups (n = 15) according to the removal technique: long-shaft round bur (EndoTracer #08, Komet, Lemgo, Germany), SonicFlex Endo (KaVo, Biberach, Germany), DT Post Removal Kit (VDW, Munich, Germany). Roots were scanned before post cementation and after post removal using micro-computed tomography. Dentin loss, residual luting material, working time, and the induction of microcracks were assessed. Statistical analysis was performed by using multiple contrast tests (max-t tests, α = 0.05). Correlations between parameters dentin loss/new microcracks and dentin loss/residual material were calculated using Kendall's tau. RESULTS Post removal with SonicFlex Endo resulted in the highest amount of removed dentin with significant differences to the round bur and the DT Post Removal Kit. No technique was found to completely remove the post and luting material. All techniques induced microcracks with the DT Post Removal Kit presenting the highest number of new defects. No correlation between dentin loss and new microcracks was observed. Deviations from the original root canal occurred in all groups, but no perforation was observed. CONCLUSIONS All techniques resulted in dentin loss, residual luting material, and the formation of microcracks. However, no correlation between dentin loss and the induction of microcracks was observed. CLINICAL RELEVANCE As all techniques resulted in microcrack formation and dentin loss, this study emphasizes the risk of iatrogenic damage due to post removal procedures.
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Affiliation(s)
- Franziska Haupt
- Department for Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Robert-Koch-Str. 40, 37075, Göttingen, Germany.
| | - Insa Riggers
- Department for Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Robert-Koch-Str. 40, 37075, Göttingen, Germany
| | - Frank Konietschke
- Charité - University Medical Center Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität Berlin, and Berlin Institute of Health, Institute of Biometry and Clinical Epidemiology, Berlin, Germany.,Berlin Institute of Health (BIH), Berlin, Germany
| | - Tina Rödig
- Department for Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Robert-Koch-Str. 40, 37075, Göttingen, Germany
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Kılıç Y, Karataşlıoğlu E, Kaval ME. The Effect of Root Canal Preparation Size and Taper of Middle Mesial Canals on Fracture Resistance of the Mandibular Molar Teeth: An In Vitro Study. J Endod 2021; 47:1467-1471. [PMID: 34118255 DOI: 10.1016/j.joen.2021.06.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 05/27/2021] [Accepted: 06/03/2021] [Indexed: 12/13/2022]
Abstract
INTRODUCTION The aim of the present study was to investigate the influence of root canal preparation size and taper of middle mesial (MM) canals on fracture resistance of mandibular molars. METHODS Fifty-five mandibular molar teeth having an MM canal were selected based on the cone-beam computed tomographic analysis. After the decoronation and distal root separation procedure, the lengths of the mesial roots were standardized to 13 mm. The specimens were randomly distributed into 5 groups (n = 11). Mesiobuccal and mesiolingual canals were prepared up to size 30.06 using VDW.ROTATE rotary files (VDW, Munich, Germany). The MM canal was prepared up to size 25.04, 25.06, 30.04, and 30.06, respectively. No preparation was done in the MM canal in the control group. After the irrigation protocol, the canals were obturated with the single-cone technique. A thin layer of silicone-coated specimens was embedded in acrylic resin and subjected to a fracture strength test by a universal testing machine. A vertical force was applied to the roots until they fracture. Statistical analysis was performed with 1-way analysis of variance and post hoc Duncan tests (P = .05). RESULTS There was no significant difference between group 25.04 and the control group, but the fracture strengths of these groups were found to be significantly higher than that of groups 25.06, 30.04, and 30.06 (P < .05). CONCLUSIONS Within the limitations of this study, we concluded that increasing the apical diameter and taper in the MM canal reduces the fracture strength of mandibular molar teeth. Among the tested instrumentation sizes, fracture strength decreased significantly when greater than 25.04 instrumentation sizes were chosen.
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Affiliation(s)
- Yağmur Kılıç
- Department of Endodontology, Faculty of Dentistry, Izmir Katip Çelebi University, Izmir, Turkey
| | - Emrah Karataşlıoğlu
- Department of Endodontology, Faculty of Dentistry, Izmir Katip Çelebi University, Izmir, Turkey
| | - Mehmet Emin Kaval
- Department of Endodontology, Faculty of Dentistry, Ege University, Izmir, Turkey.
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Martins JCLGD, Oliveira BP, Duarte DA, Antonino ACD, Aguiar CM, Câmara AC. Micro-computed tomographic assessment of dentinal microcrack formation in straight and curved root canals in extracted teeth prepared with hand, rotary and reciprocating instruments. Int Endod J 2021; 54:1362-1368. [PMID: 33760261 DOI: 10.1111/iej.13521] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Revised: 03/18/2021] [Accepted: 03/22/2021] [Indexed: 12/15/2022]
Abstract
AIM To compare microcrack formation in roots of extracted teeth after the shaping of straight and curved root canals with hand, rotary and reciprocating files using micro-computed tomographic (micro-CT) analysis. METHODOLOGY Thirty straight mandibular incisors and 30 severely curved mesial roots of mandibular molars were randomly divided into 6 experimental groups (n = 10) according to the systems used for the root canal preparation and the root canal curvature: ProTaper Universal for Hand Use (Dentsply Sirona, Ballaigues, Switzerland), HyFlex EDM (Coltene-Whaledent, Altstätten, Switzerland) and Reciproc Blue (VDW, Munich, Germany) files used in mandibular incisors (straight canals) and mesial roots of mandibular molars (curved canals). The roots were imaged with micro-CT scanning at an isotropic resolution of 14 μm before and after root canal preparation, and the cross-sectional images generated were assessed to detect microcracks. RESULTS All dentinal defects identified after root canal preparation were already present before instrumentation, and no new microcracks were detected. Dentinal microcracks were present in 19% (ProTaper Universal for Hand Use), 11% (Hyflex EDM) and 23% (Reciproc Blue) of the cross-sections when the instrumentation was performed in mandibular incisors. Instrumentation of mandibular molars revealed microcracks in 15% (ProTaper Universal for Hand Use), 16% (Hyflex EDM) and 17% (Reciproc Blue) of the cross-sections. CONCLUSIONS Preparation of straight and curved root canals with ProTaper Universal for Hand Use, HyFlex EDM and Reciproc Blue systems did not produce microcracks in extracted teeth when evaluated with micro-CT.
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Affiliation(s)
- J C L G D Martins
- Department of Prosthodontics and Oral and Maxillofacial Surgery, Dental School, Recife, PE, Brazil
| | - B P Oliveira
- Department of Prosthodontics and Oral and Maxillofacial Surgery, Dental School, Recife, PE, Brazil
| | - D A Duarte
- Department of Nuclear Energy, Federal University of Pernambuco, Recife, PE, Brazil
| | - A C D Antonino
- Department of Nuclear Energy, Federal University of Pernambuco, Recife, PE, Brazil
| | - C M Aguiar
- Department of Prosthodontics and Oral and Maxillofacial Surgery, Dental School, Recife, PE, Brazil
| | - A C Câmara
- Department of Prosthodontics and Oral and Maxillofacial Surgery, Dental School, Recife, PE, Brazil
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Malentacca A, Zaccheo F, Scialanca M, Fordellone F, Rupe C, Lajolo C. Repair of teeth with cracks in crowns and roots: An observational clinical study. Int Endod J 2021; 54:1738-1753. [PMID: 34291470 DOI: 10.1111/iej.13598] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Accepted: 07/20/2021] [Indexed: 11/26/2022]
Abstract
AIM This retrospective observational study investigated the survival rate of teeth with radicular cracks that were restored using composite materials. METHODOLOGY The study was approved by the Ethical Committee of Sistema Sanitario Nazionale (prot. N°2370CELazio1), Clinicaltrials.gov identifier: NCT04430205. Between 1991 and 2019, 87 teeth with radicular cracks (87 patients [46 men, 41 women, mean age 50.2 years]) were treated with adhesive composite restorations. Forty-five cracks were observed in the maxillary posterior teeth (molars and premolars), 40 in the mandibular posterior teeth and only two cracks in the anterior teeth, both in maxilla. Based on the depth of the crack, teeth were categorized as proximal radicular cracked teeth (PRCT), in which the fracture line was restricted within the pulpal floor or the coronal one-third of the root and deep radicular cracked teeth (DRCT), in which the fracture line extended to the middle and apical thirds of the root canal up to the apex. Bone loss/recovery was evaluated radiographically at 1-year follow-up. All patients were treated using surgical microscopy by the same operator. Logistic regression analysis was performed to determine independent predictors of extraction. Kaplan-Meier survival curves were used to analyse PRCT and DRCT. RESULTS Among 87 cracked teeth, 66 were molars, 19 premolars and 2 incisors. Fifty-two were DRCT, 35 were PRCT, 46 had a periodontal probing defect. Patients were followed up for a mean of 66.9 months (standard deviation 44.6, min 1 to max 172). Lack of probing depth was a significant protective factor against extraction (odds ratio [OR] 0.027, 95% confidence interval [CI] 0.003-0.27, p < .05), whereas further bone loss (OR 10.63, 95% CI 2.08-54.36, p < .05) was a risk factor for extraction. More than 50% of teeth treated with the adhesive protocol were functional (46 of 87 teeth [χ2 test], p < .05) at 5-year follow-up. Among the PRCT group, a 78% survival rate at 5 years was found, while among the DRCT group, a 58% survival rate was found. CONCLUSION Composite resin restorations resulted in tooth survival in >50% of patients; 85.4% of PRCT and 61.5% of DRCT were functional after 5 years of follow-up.
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Affiliation(s)
| | | | | | | | - Cosimo Rupe
- Head and Neck Department, "Fondazione Policlinico Universitario A. Gemelli - IRCCS" - Università Cattolica del Sacro Cuore, Rome, Italy
| | - Carlo Lajolo
- Head and Neck Department, "Fondazione Policlinico Universitario A. Gemelli - IRCCS" - Università Cattolica del Sacro Cuore, Rome, Italy
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Belladonna FG, Rodrigues LLC, Leal ASM, Oliveira HE, Maciel ACDC, Cavalcante DM, Silva EJNL, Valois ÉM, Souza EM, De-Deus G. Is canal overinstrumentation able to produce apical root dentinal microcracks in extracted teeth? Int Endod J 2021; 54:1647-1652. [PMID: 33932037 DOI: 10.1111/iej.13540] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Accepted: 04/27/2021] [Indexed: 12/19/2022]
Abstract
AIM To assess the impact of mechanical overinstrumentation of root canals in extracted teeth on the development of dentinal microcracks in the apical portion of the root by means of micro-computed tomographic (micro-CT) analysis. Root canal preparation short of the canal terminus and at the apical foramen (AF) were used as controls. METHODOLOGY Twenty 2-rooted maxillary premolars with two canals were selected, scanned in a micro-CT device and the root canals prepared sequentially using Reciproc M-Wire R25 instruments to working lengths: 1 mm short of the AF (AF - 1 mm), at the AF (AF), and overinstrumentation (AF + 1 mm). A micro-CT scan of each specimen was performed after each time point. After reconstruction and co-registration procedures, the images were screened from the cementoenamel junction to the apex (n = 55 352) to identify the presence of dentinal microcracks in the apical third of the root. RESULTS After the analyses of 55 352 slices, dentinal microcracks were visualized in 12.45% of the images (6892 slices), with 5.73% (3174 slices) in the cervical, 3.57% (1976 slices) in the middle and 3.15% (1740 slices) in the apical third. All dentinal microcracks observed at all time points (AF - 1 mm, AF and AF + 1 mm) were already present in the corresponding images before canal instrumentation. Therefore, no new microcracks were detected, regardless of the working length used for canal instrumentation. CONCLUSION Reciprocating root canal preparation either short, at or beyond the AF (overinstrumentation) did not create dentinal microcracks in the roots of extracted 2-rooted maxillary premolars.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Erick Miranda Souza
- Department of Dentistry II, Federal University of Maranhão, São Luís, Brazil
| | - Gustavo De-Deus
- Department of Endodontics, Fluminense Federal University (UFF), Niterói, Brazil
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Influence of additional apical enlargement on microcrack formation in root dentine: a micro-computed tomography investigation. Clin Oral Investig 2021; 25:4137-4143. [PMID: 33409686 DOI: 10.1007/s00784-020-03745-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Accepted: 12/15/2020] [Indexed: 01/04/2023]
Abstract
OBJECTIVES To assess the effect of additional apical enlargement using nickel titanium (NiTi) instruments on the incidence of microcracks using micro-computed tomographic analysis. MATERIALS AND METHODS Fifty-one premolars with single canals were enlarged to ProTaper Gold (PTG) F2 (25/08) (Dentsply Sirona), ProFile Vortex Blue (VB) 25/06 (Dentsply Tulsa), or WaveOne Gold (WOG) primary (25/07) (Dentsply Sirona) NiTi rotary instruments (n = 17 each). Afterward, additional apical enlargement was performed in each group with its corresponding larger instrument (F3 (30/09), VB 30/06, or WOG Medium (35/06) instruments, respectively). All teeth were imaged with micro-computed tomography before canal enlargement and after initial and additional apical enlargements to detect new microcracks at the apical 5 mm. An Aligned Rank Transform ANOVA was conducted to examine the effects of file type and canal enlargement on the number of new microcracks resulting from enlargement. A Kruskal-Wallis test was run to compare the file types at each canal enlargement stage. RESULTS A significant main effect (P = 0.026) of canal enlargement on the number of new microcracks was found; the number of apical microcracks found after additional enlargement was significantly greater than baseline (P = 0.021); no significant difference was found between baseline and initial enlargement (P = 0.506) and between initial enlargement and additional enlargement (P = 0.252). The Kruskal-Wallis tests found no difference between file types at baseline (P = 0.348), after initial enlargement (P = 0.369) or additional enlargement (P = 0.133). CONCLUSIONS Regardless of the instrumentation system used, additional apical enlargement led to the formation of high number of new microcracks. CLINICAL SIGNIFICANCE The results indicated that additional enlargement induced significant number of apical microcracks.
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Root fractures in seniors: Consequences of acute embrittlement of dentin. Dent Mater 2020; 36:1464-1473. [DOI: 10.1016/j.dental.2020.08.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 07/03/2020] [Accepted: 08/29/2020] [Indexed: 12/17/2022]
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Miguéns-Vila R, Martín-Biedma B, De-Deus G, Belladonna FG, Peña-López A, Castelo-Baz P. Micro-computed Tomographic Evaluation of Dentinal Microcracks after Preparation of Curved Root Canals with ProTaper Gold, WaveOne Gold, and ProTaper Next Instruments. J Endod 2020; 47:309-314. [PMID: 33096193 DOI: 10.1016/j.joen.2020.10.014] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 10/08/2020] [Accepted: 10/15/2020] [Indexed: 12/19/2022]
Abstract
INTRODUCTION The aim of this study was to evaluate the influence of rotary (ProTaper Next [PTN; Dentsply Maillefer, Ballaigues, Switzerland] and ProTaper Gold [PTG, Dentsply Maillefer]) and reciprocating (WaveOne Gold [WOG, Dentsply Maillefer]) systems in dentinal microcrack generation after the preparation of curved root canals using micro-computed tomographic analysis. METHODS Twenty-four human mandibular molars with curved roots were scanned in a micro-computed tomographic device using an isotropic resolution of 6.78 μm and randomly assigned into 1 of 3 experimental groups (n = 8) according to the root canal instrumentation system used (PTN, PTG, or WOG). Then, the root canals were prepared up to PTN X2, PTG F2, and WOG Primary instruments in the PTN, PTG, and WOG groups, respectively. After canal preparation, each specimen was scanned again. Pre- and postoperative cross-sectional images of the roots (N = 35,304) were analyzed to identify the presence of dentinal microcracks. RESULTS Overall, 26% of the images presented dentinal defects (n = 9188). Dentinal microcracks were observed in 24.6%, 26%, and 27.4% of the postinstrumentation images from the PTN, PTG, and WOG groups, respectively. However, all of these dentinal microcracks were already present in the corresponding preoperative images. No new microcracks were generated after the preparation of curved root canals of mandibular molars using the aforementioned systems. CONCLUSIONS Root canal instrumentation with PTN, PTG, and WOG systems did not induce the formation of new dentinal microcracks.
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Affiliation(s)
- Ramón Miguéns-Vila
- University of Santiago de Compostela, Santiago de Compostela, Galicia, Spain.
| | | | - Gustavo De-Deus
- Fluminense Federal University, Niterói, Rio de Janeiro, Brazil
| | | | | | - Pablo Castelo-Baz
- University of Santiago de Compostela, Santiago de Compostela, Galicia, Spain
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Fráter M, Jakab A, Braunitzer G, Tóth Z, Nagy K. The potential effect of instrumentation with different nickel titanium rotary systems on dentinal crack formation-An in vitro study. PLoS One 2020; 15:e0238790. [PMID: 32903275 PMCID: PMC7480847 DOI: 10.1371/journal.pone.0238790] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Accepted: 08/24/2020] [Indexed: 11/17/2022] Open
Abstract
The potential mechanical impact of different rotary systems used for root canal preparation has been a matter of debate for long. The aim of this study was to explore the incidence of dentinal cracks after root canal instrumentation with various rotary systems, in vitro. One hundred and eighty intact lower central incisors were selected and randomly divided into fourteen treatment groups (n = 12/group) and a control group (n = 12). After decoronation, the root canals were instrumented with fourteen different rotary systems (E3, E3 azure, NT2, Hyflex CM, Hyflex EDM, 2Shape, OneCurve, ProTaper Next, ProTaper Gold, WaveOne Gold, Mtwo, Reciproc Blue, TF adaptive, K3XF). All roots were horizontally sectioned at 3, 6, and 9 mm from the apex with a low-speed saw under water-cooling. The slices were then examined under stereomicroscope for dentinal cracks. No cracks were found in the control group. Cracks were found in all treatment groups, predominantly in the 3 mm slices. There was no statistically significant difference in the number of cracks when comparing the different systems to each other at any section level. At 3 mm, however, five of the studied systems, namely K3XF (p = 0.004), Protaper Next (p = 0.001), Reciproc Blue (p<0.001), TF adaptive (p = 0.050), and 2Shape (p = 0.009) presented a significantly higher number of cracks than the control group. Within the limitations of this study, instrumented canals presented dentinal cracks, while uninstrumented ones presented no cracks after sectioning. There seems to be no significant difference among the tested systems regarding crack formation in the instrumented root canal wall. Crack formation occurred irrespective of the motion of the rotary system (rotational or reciprocation). Further studies are needed to clarify the factors that contribute to crack formation in the case of each individual rotary system.
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Affiliation(s)
- Márk Fráter
- Department of Operative and Esthetic Dentistry, Faculty of Dentistry, University of Szeged, Szeged, Hungary
| | - András Jakab
- Department of Operative and Esthetic Dentistry, Faculty of Dentistry, University of Szeged, Szeged, Hungary
| | | | - Zsolt Tóth
- Department of Oral Biology and Experimental Dental Research, Faculty of Dentistry, University of Szeged, Szeged, Hungary
| | - Katalin Nagy
- Department of Oral Surgery, Faculty of Dentistry, University of Szeged, Szeged, Hungary
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Yılmaz F, Eren İ, Eren H, Badi MA, Ocak M, Çelik HH. Evaluation of the Amount of Root Canal Dentin Removed and Apical Transportation Occurrence after Instrumentation with ProTaper Next, OneShape, and EdgeFile Rotary Systems. J Endod 2020; 46:662-667. [DOI: 10.1016/j.joen.2020.01.022] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 01/12/2020] [Accepted: 01/28/2020] [Indexed: 10/24/2022]
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Albuquerque PP, Hungaro Duarte MA, Pelegrine RA, Kato AS, Stringheta CP, Duque JA, Bueno CEDS. Influence of foraminal enlargement on the apical extrusion of filling material: Volumetric analysis using micro‐computed tomography. AUST ENDOD J 2020; 46:210-216. [DOI: 10.1111/aej.12394] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Revised: 10/13/2019] [Accepted: 12/27/2019] [Indexed: 11/30/2022]
Affiliation(s)
| | - Marco Antonio Hungaro Duarte
- Department of Restorative Dentistry, Endodontics and Dental Materials School of Dentistry of Bauru University of São Paulo Bauru Brazil
| | - Rina Andréa Pelegrine
- Faculdade São Leopoldo Mandic Instituto de Pesquisas São Leopoldo Mandic Campinas Brazil
| | - Augusto Shoji Kato
- Faculdade São Leopoldo Mandic Instituto de Pesquisas São Leopoldo Mandic Campinas Brazil
| | | | - Jussaro Alves Duque
- Department of Restorative Dentistry, Endodontics and Dental Materials School of Dentistry of Bauru University of São Paulo Bauru Brazil
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Zuli TAB, Guedes OA, Gonçalves GFZA, da Silva Júnior AR, Borges ÁH, Aranha AMF. Effect of post space preparation drills on the incidence of root dentin defects. Restor Dent Endod 2020; 45:e53. [PMID: 33294418 PMCID: PMC7691261 DOI: 10.5395/rde.2020.45.e53] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 05/03/2020] [Accepted: 06/02/2020] [Indexed: 11/17/2022] Open
Abstract
Objectives This study investigated the incidence of root dentin defects after the use of different post space preparation (PSP) drills. Materials and Methods Seventy-two bovine incisors were selected and obtained 14-mm-long root sections. Twelve roots served as controls with no intervention (G1). The 60 root canals remaining were instrumented using the crown-down technique with the ProTaper Next system and obturated using the lateral condensation technique. Specimens were randomly distributed into 5 groups (n = 12) according to the operative steps performed: G2, root canal instrumentation and filling (I+F); G3, I+F and PSP with Gates-Glidden drills; G4, I+F and PSP with Largo-Peeso reamers; G5, I+F and PSP with Exacto drill; and G6, I+F and PSP with WhitePost drill. Roots were sectioned at 3, 6, 9, and 12 mm from the apex, and digital images were captured. The presence of root dentin defects was recorded. Data were analyzed by the χ2 test, with p < 0.05 considered to indicate statistical significance. Results Root dentin defects were observed in 39.6% of the root sections. No defects were observed in G1. G5 had significantly more cracks and craze lines than G1, G2, and G3 (p < 0.05), and more fractures than G1, G2, G3, and G4 (p < 0.05). When all root sections were analyzed together, significantly more defects were observed at the 12-mm level than at the 3-mm level (p < 0.05). Conclusions PSP drills caused defects in the root dentin. Gates-Glidden drills caused fewer root defects than Largo-Peeso reamers and Exacto drills.
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Affiliation(s)
| | - Orlando Aguirre Guedes
- Department of Endodontics, School of Dentistry, Centro Universitário de Anápolis - UniEvangélica, Anápolis, GO, Brazil
| | | | | | - Álvaro Henrique Borges
- Department of Oral Sciences, School of Dentistry, University of Cuiabá - UNIC, Cuiabá, MT, Brazil
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Stringheta CP, Bueno CES, Kato AS, Freire LG, Iglecias EF, Santos M, Pelegrine RA. Micro‐computed tomographic evaluation of the shaping ability of four instrumentation systems in curved root canals. Int Endod J 2019; 52:908-916. [DOI: 10.1111/iej.13084] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Accepted: 01/23/2019] [Indexed: 11/28/2022]
Affiliation(s)
- C. P. Stringheta
- Department of Endodontics São Leopoldo Mandic Dental Research Center CampinasSP Brazil
| | - C. E. S. Bueno
- Department of Endodontics São Leopoldo Mandic Dental Research Center CampinasSP Brazil
| | - A. S. Kato
- Department of Endodontics São Leopoldo Mandic Dental Research Center CampinasSP Brazil
| | - L. G. Freire
- Division of Endodontics Department of Restorative Dentistry School of Dentistry University of São Paulo São Paulo SP Brazil
| | - E. F. Iglecias
- Division of Endodontics Department of Restorative Dentistry School of Dentistry University of São Paulo São Paulo SP Brazil
| | - M. Santos
- Division of Endodontics Department of Restorative Dentistry School of Dentistry University of São Paulo São Paulo SP Brazil
| | - R. A. Pelegrine
- Department of Endodontics São Leopoldo Mandic Dental Research Center CampinasSP Brazil
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Uğur Aydın Z, Keskin NB, Özyürek T. Effect of Reciproc blue, XP‐endo shaper, and WaveOne gold instruments on dentinal microcrack formation: A micro‐computed tomographic evaluation. Microsc Res Tech 2019; 82:856-860. [DOI: 10.1002/jemt.23227] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Revised: 12/27/2018] [Accepted: 01/16/2019] [Indexed: 11/07/2022]
Affiliation(s)
- Zeliha Uğur Aydın
- Department of Endodontics, Faculty of DentistryBolu Abant lzzet Baysal University Bolu Turkey
| | - Neslihan Büşra Keskin
- Department of EndodonticsFaculty of Dentistry, Yildirim Beyazit University Ankara Turkey
| | - Taha Özyürek
- Department of Endodontics, Faculty of DentistryIstanbul Medeniyet University Istanbul Turkey
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Yan W, Montoya C, Øilo M, Ossa A, Paranjpe A, Zhang H, Arola DD. Contribution of Root Canal Treatment to the Fracture Resistance of Dentin. J Endod 2019; 45:189-193. [DOI: 10.1016/j.joen.2018.10.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Revised: 10/04/2018] [Accepted: 10/15/2018] [Indexed: 10/27/2022]
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De‐Deus G, Cavalcante DM, Belladonna FG, Carvalhal J, Souza EM, Lopes RT, Versiani MA, Silva EJNL, Dummer PMH. Root dentinal microcracks: a post‐extraction experimental phenomenon? Int Endod J 2018; 52:857-865. [DOI: 10.1111/iej.13058] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Accepted: 12/08/2018] [Indexed: 11/29/2022]
Affiliation(s)
- G. De‐Deus
- Department of Endodontics Fluminense Federal University Niterói Rio de JaneiroBrazil
| | - D. M. Cavalcante
- Department of Endodontics Fluminense Federal University Niterói Rio de JaneiroBrazil
| | - F. G. Belladonna
- Department of Endodontics Fluminense Federal University Niterói Rio de JaneiroBrazil
| | - J. Carvalhal
- Department of Endodontics Fluminense Federal University Niterói Rio de JaneiroBrazil
| | - E. M. Souza
- Department of Dentistry II Federal University of Maranhão São Luís MaranhãoBrazil
| | - R. T. Lopes
- Nuclear Engineering Program Federal University of Rio de Janeiro Rio de JaneiroBrazil
| | - M. A. Versiani
- Department of Endodontics Fluminense Federal University Niterói Rio de JaneiroBrazil
| | - E. J. N. L. Silva
- Department of Endodontics Grande Rio University Duque de Caxias Rio de Janeiro Brazil
| | - P. M. H. Dummer
- School of Dentistry College of Biomedical and Life Sciences Cardiff University Cardiff UK
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Mandava J, Yelisela RK, Arikatla SK, Ravi RC. Micro-computed tomographic evaluation of dentinal defects after root canal preparation with hyflex edm and vortex blue rotary systems. J Clin Exp Dent 2018; 10:e844-e851. [PMID: 30386515 PMCID: PMC6203928 DOI: 10.4317/jced.54853] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Accepted: 07/18/2018] [Indexed: 12/17/2022] Open
Abstract
Background To evaluate the incidence of dentinal microcracks formation after root canal shaping procedures with HyFlex EDM and Vortex Blue rotary systems comparing with that of hand instrumentation using micro-computed tomography. Material and Methods Mandibular first molar teeth (n=60) having 50 to 200mesial root curvature were scanned using high resolution micro-CT imaging before root canal preparation to identify the presence of dentinal defects. Post-instrumentation cross-sectional images were taken and increased number and type of root defects were assessed and recorded. The data was statistically analysed by using chi-square test and McNemar's test at a significance level of 5%. Results HyFlex EDM has shown greater increase in post instrumentation dentinal defects. Both rotary systems exhibited increased dentinal defects formation at coronal, middle regions which is statistically significant (P=0.042) when compared to apical region. Conclusions HyFlex EDM has shown greater increase in post instrumentation dentinal defects followed by Vortex Blue rotary system and hand instrumentation resulted minimal defects. Key words:Craze lines, dentinal microcracks, micro-computed tomography, nickel-titanium files, root canal preparation.
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Affiliation(s)
- Jyothi Mandava
- Professor & Head of the department, MDS in Conservative Dentistry and Endodontics). Gitam Dental College and Hospital; Visakapatnam
| | - Rajiv-Kumar Yelisela
- Senior lecturer, MDS in Conservative Dentistry and Endodontics). Gitam Dental College and Hospital; Visakapatnam
| | - Sampath-Kumar Arikatla
- Senior lecturer, MDS in Conservative Dentistry and Endodontics). Gitam Dental College and Hospital; Visakapatnam
| | - Ravi-Chandra Ravi
- Associate Professor, MDS in Conservative Dentistry and Endodontics). Gitam Dental College and Hospital; Visakapatnam
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Impact of Access Cavity Design and Root Canal Taper on Fracture Resistance of Endodontically Treated Teeth: An Ex Vivo Investigation. J Endod 2018; 44:1402-1406. [PMID: 30049471 DOI: 10.1016/j.joen.2018.05.006] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Revised: 04/14/2018] [Accepted: 05/06/2018] [Indexed: 01/10/2023]
Abstract
INTRODUCTION The susceptibility of endodontically treated teeth (ETT) to fracture is mainly associated with the loss of tooth structure. This study evaluated the effect of the access cavity design and taper preparation of root canals on ETT fracture resistance of maxillary molars. METHODS For tapering assessment, 30 sound distobuccal roots of maxillary molars were randomly assigned to 1 of 3 groups (n = 10): a .04 taper, a .06 taper, or a .08 taper. Endodontic canal preparations were performed using the Twisted Files rotary system (Kerr Co, Glendora, CA). In addition, 48 intact maxillary first and second molars were randomly assigned to 1 of 3 groups (n = 16) for cavity preparation approaches: intact teeth, traditional access cavity (TAC), or conservative access cavity (CAC). Fracture resistance was tested using a universal testing machine. For statistical analysis, the level of significance was P ≤ .05. RESULTS The .04 taper instrumentation had the highest fracture resistance (259.61 ± 52.06), and the .08 taper had the lowest (168.43 ± 59.63). The .04 and .06 groups did not differ significantly (P > .05); however, these groups differed significantly from the .08 group (P ≤ .05). Regarding the cavity preparation approaches, the 3 groups of intact teeth, CAC, and TAC showed fracture resistance mean values of 2118.85 ± 336.97, 1705.69 ± 591.51, and 1471.11 ± 435.34, respectively, with no significant difference between the CAC and TAC groups (P > .05). CONCLUSIONS Increasing the taper of the root canal preparation can reduce fracture resistance. Moreover, access cavity preparation can reduce resistance; however, CAC in comparison with TAC had no significant impact.
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Abstract
This article provides a brief review of recent investigations concerning the structure and properties of the tooth. The last decade has brought a greater emphasis on the durability of the tooth, an improved understanding of the fatigue and fracture behavior of the principal tissues, and their importance to tooth failures. The primary contributions to tooth durability are discussed, including the process of placing a restoration, the impact of aging, and challenges posed by the oral environment. The significance of these findings to the dental community and their importance to the pursuit of lifelong oral health are highlighted.
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Affiliation(s)
- Dwayne D Arola
- Department of Materials Science and Engineering, University of Washington School of Dentistry, Roberts Hall, 333, Box 352120, Seattle, WA 98195-2120, USA; Department of Oral Health Sciences, University of Washington School of Dentistry, Seattle, WA 98195-2120, USA; Department of Restorative Dentistry, Box 357456, University of Washington School of Dentistry, Seattle, WA 98195-7456, USA.
| | - Shanshan Gao
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Renmin South Road, Chengdu, 610041, China
| | - Hai Zhang
- Department of Restorative Dentistry, Box 357456, University of Washington School of Dentistry, Seattle, WA 98195-7456, USA
| | - Radi Masri
- Department of Endodontics, Prosthodontics and Operative Dentistry, University of Maryland School of Dentistry, 650 West Baltimore Street, 4th Floor, Suite 4228, Baltimore, MD 21201, USA
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Chai H, Tamse A. Vertical Root Fracture in Buccal Roots of Bifurcated Maxillary Premolars from Condensation of Gutta-percha. J Endod 2018; 44:1159-1163. [DOI: 10.1016/j.joen.2018.03.017] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2017] [Revised: 03/25/2018] [Accepted: 03/28/2018] [Indexed: 11/16/2022]
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Borges ÁH, Damião MS, Pereira TM, Filho GS, Miranda-Pedro FL, Luiz de Oliveira da Rosa W, Piva E, Guedes OA. Influence of Cervical Preflaring on the Incidence of Root Dentin Defects. J Endod 2018; 44:286-291. [DOI: 10.1016/j.joen.2017.09.021] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Revised: 09/19/2017] [Accepted: 09/28/2017] [Indexed: 10/18/2022]
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Özyürek T, Tek V, Yılmaz K, Uslu G. Incidence of apical crack formation and propagation during removal of root canal filling materials with different engine driven nickel-titanium instruments. Restor Dent Endod 2017; 42:332-341. [PMID: 29142882 PMCID: PMC5682150 DOI: 10.5395/rde.2017.42.4.332] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Accepted: 10/09/2017] [Indexed: 11/20/2022] Open
Abstract
Objectives To determine the incidence of crack formation and propagation in apical root dentin after retreatment procedures performed using ProTaper Universal Retreatment (PTR), Mtwo-R, ProTaper Next (PTN), and Twisted File Adaptive (TFA) systems. Materials and Methods The study consisted of 120 extracted mandibular premolars. One millimeter from the apex of each tooth was ground perpendicular to the long axis of the tooth, and the apical surface was polished. Twenty teeth served as the negative control group. One hundred teeth were prepared, obturated, and then divided into 5 retreatment groups. The retreatment procedures were performed using the following files: PTR, Mtwo-R, PTN, TFA, and hand files. After filling material removal, apical enlargement was done using apical size 0.50 mm ProTaper Universal (PTU), Mtwo, PTN, TFA, and hand files. Digital images of the apical root surfaces were recorded before preparation, after preparation, after obturation, after filling removal, and after apical enlargement using a stereomicroscope. The images were then inspected for the presence of new apical cracks and crack propagation. Data were analyzed with χ2 tests using SPSS 21.0 software. Results New cracks and crack propagation occurred in all the experimental groups during the retreatment process. Nickel-titanium rotary file systems caused significantly more apical crack formation and propagation than the hand files. The PTU system caused significantly more apical cracks than the other groups after the apical enlargement stage. Conclusions This study showed that retreatment procedures and apical enlargement after the use of retreatment files can cause crack formation and propagation in apical dentin.
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Affiliation(s)
- Taha Özyürek
- Department of Endodontics, Ondokuz Mayıs University Faculty of Dentistry, Samsun, Turkey
| | - Vildan Tek
- Department of Endodontics, Bülent Ecevit University Faculty of Dentistry, Zonguldak, Turkey
| | | | - Gülşah Uslu
- Department of Endodontics, Ondokuz Mayıs University Faculty of Dentistry, Samsun, Turkey
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Stringheta CP, Pelegrine RA, Kato AS, Freire LG, Iglecias EF, Gavini G, Bueno CEDS. Micro-computed Tomography versus the Cross-sectioning Method to Evaluate Dentin Defects Induced by Different Mechanized Instrumentation Techniques. J Endod 2017; 43:2102-2107. [PMID: 29033087 DOI: 10.1016/j.joen.2017.07.015] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Revised: 07/10/2017] [Accepted: 07/18/2017] [Indexed: 10/18/2022]
Abstract
INTRODUCTION The objective of this study was to compare the methods of micro-computed tomography (micro-CT) and cross-sectioning followed by stereomicroscopy in assessing dentinal defects after instrumentation with different mechanized systems. METHODS Forty mesial roots of mandibular molars were scanned and divided into 4 groups (n = 10): Group R, Reciproc; Group PTN, ProTaper Next; Group WOG, WaveOne Gold; Group PDL, ProDesign Logic. After instrumentation, the roots were once again submitted to a micro-CT scan, and then sectioned at 3, 6, and 9 mm from the apex, and assessed for the presence of complete and incomplete dentinal defects under a stereomicroscope. The nonparametric Kruskal-Wallis, Friedman, and Wilcoxon tests were used in the statistical analysis. The study used a significance level of 5%. RESULTS The total number of defects observed by cross-sectioning followed by stereomicroscopy was significantly higher than that observed by micro-CT, in all of the experimental groups (P ≤ .05). All of the defects identified in the postoperative period were already present in the corresponding preoperative period. There was no significant difference among the instrumentation systems as to the median numbers of defects, for either cross-sectioning followed by stereomicroscopy or micro-CT, at all the root levels (P > .05). In the micro-CT analysis, no significant difference was found between the median numbers of pre- and postinstrumentation defects, regardless of the instrumentation system (P > .05). CONCLUSION None of the evaluated instrumentation systems led to the formation of new dentin defects. All of the defects identified in the stereomicroscopic analysis were already present before instrumentation, or were absent at both time points in the micro-CT analysis, indicating that the formation of new defects resulted from the sectioning procedure performed before stereomicroscopy and not from instrumentation.
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Affiliation(s)
| | - Rina Andréa Pelegrine
- Department of Endodontics, São Leopoldo Mandic Dental Research Center, Campinas, São Paulo, Brazil
| | - Augusto Shoji Kato
- Department of Endodontics, São Leopoldo Mandic Dental Research Center, Campinas, São Paulo, Brazil
| | - Laila Gonzales Freire
- Division of Endodontics, Department of Restorative Dentistry, School of Dentistry, University of São Paulo, São Paulo, São Paulo, Brazil
| | - Elaine Faga Iglecias
- Division of Endodontics, Department of Restorative Dentistry, School of Dentistry, University of São Paulo, São Paulo, São Paulo, Brazil
| | - Giulio Gavini
- Division of Endodontics, Department of Restorative Dentistry, School of Dentistry, University of São Paulo, São Paulo, São Paulo, Brazil
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Miguéns-Vila R, Martín-Biedma B, Varela-Patiño P, Ruíz-Piñón M, Castelo-Baz P. Vertical Root Fracture initiation in curved roots after root canal preparation: A dentinal micro-crack analysis with LED transillumination. J Clin Exp Dent 2017; 9:e1218-e1223. [PMID: 29167712 PMCID: PMC5694151 DOI: 10.4317/jced.54227] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Accepted: 08/09/2017] [Indexed: 11/05/2022] Open
Abstract
Background One of the causative factors of root defects is the increased friction produced by rotary instrumentation. A high canal curvature may increase stress, making the tooth more susceptible to dentinal cracks. The purpose of this study was to evaluate dentinal micro-crack formation with the ProTaper NEXT and ProTaper Universal systems using LED transillumination, and to analyze the micro-crack generated at the point of maximum canal curvature. Material and Methods 60 human mandibular premolars with curvatures between 30-49° and radii between 2-4 mm were used. The root canals were instrumented using the Protaper Universal® and Protaper NEXT® systems, with the aid of the Proglider® system. The obtained samples were sectioned transversely before subsequent analysis with LED transillumination at 2 mm and 8 mm from the apex and at the point of maximum canal curvature. Defects were scored: 0 for no defects; and 1 for micro-cracks. Results Root defects were not observed in the control group. The ProTaper NEXT system caused fewer defects (16.7%) than the ProTaper Universal system (40%) (P<0.05). The ProTaper Universal system caused significantly more micro-cracks at the point of maximum canal curvature than the ProTaper NEXT system (P<0.05). Conclusions Rotary instrumentation systems often generate root defects, but the ProTaper NEXT system generated fewer dentinal defects than the ProTaper Universal system. A higher prevalence of defects was found at the point of maximum curvature in the ProTaper Universal group. Key words:Curved root, Micro-crack, point of maximum canal curvature, ProTaper NEXT, ProTaper Universal, Vertical root fracture.
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Affiliation(s)
- Ramón Miguéns-Vila
- DDS, University of Santiago de Compostela; Master of Endodontics, Entrerrios Street, no number, 15702, Santiago de Compostela
| | - Benjamín Martín-Biedma
- PhD, University of Santiago de Compostela; Master of Endodontics, Entrerrios Street, no number, 15702, Santiago de Compostela
| | - Purificación Varela-Patiño
- PhD, University of Santiago de Compostela; Master of Endodontics, Entrerrios Street, no number, 15702, Santiago de Compostela
| | - Manuel Ruíz-Piñón
- PhD, University of Santiago de Compostela; Master of Endodontics, Entrerrios Street, no number, 15702, Santiago de Compostela
| | - Pablo Castelo-Baz
- DDS, PhD, University of Santiago de Compostela; Master of Endodontics, Entrerrios Street, no number, 15702, Santiago de Compostela
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Canal Transportation, Unprepared Areas, and Dentin Removal after Preparation with BT-RaCe and ProTaper Next Systems. J Endod 2017; 43:1683-1687. [DOI: 10.1016/j.joen.2017.04.012] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Revised: 04/08/2017] [Accepted: 04/16/2017] [Indexed: 11/21/2022]
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Coelho MS, Card SJ, Tawil PZ. Light-emitting diode assessment of dentinal defects: the role of presumed extraction forces. Restor Dent Endod 2017; 42:232-239. [PMID: 28808640 PMCID: PMC5553023 DOI: 10.5395/rde.2017.42.3.232] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Accepted: 07/09/2017] [Indexed: 11/11/2022] Open
Abstract
Objectives The evaluation of iatrogenic dentinal defects in extracted teeth may be influenced by extraction forces and prolonged dry times. The purpose of this study was to compare the presence of dentinal defects in freshly extracted, periodontally compromised teeth with those in a group of teeth with uncontrolled extraction forces and storage time. Materials and Methods The experimental group consisted of eighteen roots obtained from teeth extracted due to periodontal reasons with class II or III mobility. They were kept in saline and sectioned within 1 hour following extraction. The control group consisted of matched root types obtained from an anonymous tooth collection, consistent with previous dentinal defect studies. The slices were obtained at 3, 6, and 9 mm from the apex. The imaging process exposed all specimens to no more than 60 seconds of dry time. The × 12.8 magnification was used for the 9 mm slices and × 19.2 magnification for the 3 mm and 6 mm slices under light-emitting diode (LED) transillumination. The root canal spaces and periodontal tissues were masked to minimize extraneous factors that might influence the evaluators. Chi-square test was used for statistical analysis. Results Dentinal defects were detected in 17% of the experimental group teeth, compared to 61% of control teeth (p = 0.015). Conclusions LED transillumination assessment of freshly extracted roots with class II or III mobility showed smaller number of dentinal defects than roots with uncontrolled storage time and extraction forces. The use of freshly extracted roots with mobility should be considered for future dental defect assessment studies.
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Affiliation(s)
- Marcelo Santos Coelho
- Department of Endodontics, Universidade Paulista School of Dentistry, Sorocaba, SP, Brazil
| | - Steven J Card
- Department of Endodontics, University of North Carolina School of Dentistry, Chapel Hill, NC, USA
| | - Peter Z Tawil
- Department of Endodontics, University of North Carolina School of Dentistry, Chapel Hill, NC, USA
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Dentinal Microcrack Development after Canal Preparation: A Longitudinal in Situ Micro-computed Tomography Study Using a Cadaver Model. J Endod 2017; 43:1553-1558. [PMID: 28735793 DOI: 10.1016/j.joen.2017.04.027] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2017] [Revised: 04/23/2017] [Accepted: 04/24/2017] [Indexed: 11/23/2022]
Abstract
INTRODUCTION The purpose of this study was to evaluate the development of dentinal microcracks after root canal preparation with Reciproc and ProTaper Universal systems using an in situ cadaver model by means of a micro-computed tomography (micro-CT) imaging system. METHODS At autopsy, 8 maxillary bone blocks having at least the first and second premolar teeth (n = 16) were excised, scanned at a resolution of 13.18 μm, and randomly distributed into 2 groups (n = 8) according to the preparation protocol: Reciproc and ProTaper Universal systems. Root canals were prepared up to R25 and F2 instruments in the Reciproc and ProTaper Universal groups, respectively. After the preparation procedures, the specimens were scanned again, and the registered preoperative and postoperative cross-section images of the roots (n = 19,060) were screened to identify the presence of dentinal defects. RESULTS In the Reciproc group, 9176 cross-section images were analyzed, and no crack was observed. In the ProTaper Universal group, 244 of 9884 cross-section slices (2.46%) had dentinal defects; however, all defects were already present in the corresponding preoperative images, indicating that no new microcrack was created after canal preparation. CONCLUSIONS In situ root canal preparation of maxillary premolars with Reciproc and ProTaper Universal systems did not induce the formation of dentinal microcracks in a cadaver model as observed by micro-CT.
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Pedullà E, Genovesi F, Rapisarda S, La Rosa GR, Grande NM, Plotino G, Adorno CG. Effects of 6 Single-File Systems on Dentinal Crack Formation. J Endod 2017; 43:456-461. [DOI: 10.1016/j.joen.2016.10.038] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 10/13/2016] [Accepted: 10/24/2016] [Indexed: 12/13/2022]
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de Arruda Bitencourt M, Pedro Rocha DG, da Silveira Bueno CE. Incidence of Dentinal Defects on the External Apical Root Surface after Instrumentation with WaveOne Reciprocating Files at Different Working Lengths. J Endod 2017; 43:491-495. [PMID: 28231984 DOI: 10.1016/j.joen.2016.11.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2016] [Revised: 11/06/2016] [Accepted: 11/07/2016] [Indexed: 10/20/2022]
Abstract
INTRODUCTION The aim of this in vitro study was to identify the formation of dentinal defects on the external apical root surface of teeth instrumented at different working lengths by using WaveOne reciprocating files. METHODS Sixty human single-rooted mandibular premolars were divided into 3 groups (n = 20) according to the file used for instrumentation: WaveOne Small (WOS), premolars presenting mechanical resistance to the penetration of #10 K-file 1 mm short of the apical foramen; WaveOne Primary (WOP), this limit easily reached with #10 K-file; and WaveOne Large (WOL), this limit easily reached with #20 K-file or higher. A closed system and a muffle were created to allow alternating sessions of root canal instrumentation and image acquisition. The teeth were further divided according to 3 different working lengths: 1 mm short of the apical foramen, flush with the apical foramen, and 1 mm beyond the apical foramen. Micrographs of the external apical root surface of each specimen at baseline and after instrumentation up to each working length were examined for the presence of dentinal defects. Inter-examiner agreement was evaluated by using Pearson correlation test, and the Kruskal-Wallis test was used to analyze intragroup and intergroup differences (P < .05). RESULTS Inter-examiner agreement was high in all experimental groups (r = 1.0000, r = 0.8885, and r = 0.7867 for WOS, WOP, and WOL, respectively). There was no significant difference in the number of teeth with dentinal defects in the intergroup (P = .8119) or intragroup analyses (P = .9309, .8648, and .4772 for WOS, WOP, and WOL, respectively). CONCLUSIONS Instrumentation with different WaveOne files up to different working lengths was not associated with the formation of dentinal defects.
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Topçuoğlu HS, Düzgün S, Akpek F, Topçuoğlu G. Effect of glide path and apical preparation size on the incidence of apical crack during the canal preparation using Reciproc, WaveOne, and ProTaper Next systems in curved root canals: A stereomicroscope study. SCANNING 2016; 38:585-590. [PMID: 26792649 DOI: 10.1002/sca.21304] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2015] [Revised: 12/23/2015] [Accepted: 01/07/2016] [Indexed: 05/26/2023]
Abstract
This study evaluated the effect of creating a glide path and apical preparation size on the incidence of apical cracks during canal preparation in mandibular molar teeth with curved canals. One hundred and forty extracted teeth were used. The teeth were randomly assigned to one control group or six experimental groups (n = 20 per group) for canal preparation. No preparation was performed on teeth in the control group. In three of the six experimental groups, a glide path was not created; a glide path was created on the curved mesial canals of all teeth in the remaining three experimental groups. All teeth in experimental groups were then instrumented with the following systems: Reciproc, WaveOne (WO), and ProTaper Next (PTN). Digital images of the apical root surfaces of these teeth were recorded before preparation, after instrumentation with size 25 files, and after instrumentation with size 40 files. The images were then inspected for the presence of any new apical cracks and propagation. There was no significant difference between the experimental groups during canal preparation using size 25 files (p > 0.05). Reciproc and WO caused more new apical cracks than did PTN during canal preparation using size 40 files (p < 0.05). However, canal preparation using size 40 files did not cause propagation of existing cracks (p > 0.05). Performing a glide path prior to canal preparation did not change the incidence of apical crack during preparation. Additionally, increasing apical preparation size may increase the incidence of apical crack during canal preparation. SCANNING 38:585-590, 2016. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
| | - Salih Düzgün
- Faculty of Dentistry, Department of Endodontics, Erciyes University, Kayseri, Turkey
| | - Firdevs Akpek
- Faculty of Dentistry, Department of Endodontics, Erciyes University, Kayseri, Turkey
| | - Gamze Topçuoğlu
- Faculty of Dentistry, Department of Pedodontics, Erciyes University, Kayseri, Turkey
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Coelho MS, Card SJ, Tawil PZ. Light-emitting Diode Assessment of Dentinal Defects after Root Canal Preparation with Profile, TRUShape, and WaveOne Gold Systems. J Endod 2016; 42:1393-6. [DOI: 10.1016/j.joen.2016.06.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2016] [Revised: 05/20/2016] [Accepted: 06/05/2016] [Indexed: 10/21/2022]
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Pawar AM, Barfiwala D, Pawar M, Metzger Z, Kfir A, Jain N. Assessment of the fracture resistance of teeth instrumented using 2 rotary and 2 reciprocating files versus the Self-Adjusting File (SAF): An ex vivo comparative study on mandibular premolars. J Conserv Dent 2016; 19:138-42. [PMID: 27099419 PMCID: PMC4815541 DOI: 10.4103/0972-0707.178692] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Aim: Current ex vivo study compared fracture resistance of teeth instrumented using 5 endodontic files, filled with Gutta-percha and AH Plus. Materials and Methods: Sixty freshly extracted, single-rooted mandibular premolars were acquired and decoronated to obtain 15 mm segments. These samples were randomly divided into six groups (n = 10). Group 1 served as the control containing untreated samples (without instrumentation or filling). In Groups 2-6, samples were instrumented using rotary (Universal ProTaper and Revo-S), reciprocating (WaveOne and RECIPROC®), and self-adjusting file (SAF), respectively. Following instrumentation, the samples were filled by lateral compaction with Gutta-percha and AH Plus. A week later, after the sealer was completely set, a vertical load was applied to the specimen's canal in each group until fracture. The loads required for fracture were recorded, and statistical analysis was performed. Results: The mean fracture load differed significantly among the groups (P < 0.01; one-way ANOVA). Tukey's post-hoc tests revealed that the fracture resistance was similar in the control and SAF groups (P > 0.05) and was significantly higher than that of the 2 rotary and reciprocating groups (P < 0.01). Conclusion: The samples instrumented by the SAF exhibited a better fracture resistance.
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Affiliation(s)
- Ajinkya M Pawar
- Department of Conservative Dentistry and Endodontics, D. Y. Patil Dental School and Hospital, Pune, Maharashtra, India
| | - Digesh Barfiwala
- Department of Conservative Dentistry and Endodontics, D. Y. Patil Dental School and Hospital, Pune, Maharashtra, India
| | - Mansing Pawar
- Department of Conservative Dentistry and Endodontics, Government Dental College and Hospital, Mumbai, Maharashtra, India
| | - Zvi Metzger
- Department of Endodontology, Tel Aviv University, Tel Aviv, Israel
| | - Anda Kfir
- Department of Endodontology, Tel Aviv University, Tel Aviv, Israel
| | - Niharika Jain
- Department of Conservative Dentistry and Endodontics, Hitkarini Dental College and Hospital, Jabalpur, Madhya Pradesh, India
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Kang SH, Kim BS, Kim Y. Cracked Teeth: Distribution, Characteristics, and Survival after Root Canal Treatment. J Endod 2016; 42:557-62. [DOI: 10.1016/j.joen.2016.01.014] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Revised: 12/11/2015] [Accepted: 01/18/2016] [Indexed: 10/22/2022]
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Gergi RM, Osta NE, Naaman AS. Dentinal crack formation during root canal preparations by the twisted file adaptive, Reciproc and WaveOne instruments. Eur J Dent 2016; 9:508-512. [PMID: 26929688 PMCID: PMC4745231 DOI: 10.4103/1305-7456.172634] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Objective: This study aimed to compare the frequency of dentinal microcracks after root canal shaping with 2 reciprocating (Reciproc and WaveOne) and 1 combined continuous reciprocating motion twisted files adaptive (TFA) rotary system. Materials and Methods: Ninety molars were chosen and divided into three groups of 30 each. Root canal preparation was achieved by using Reciproc R25, Primary WaveOne and TFA systems. All the roots were horizontally sectioned at 15, 9, and 3 mm from the apex. The slices were then viewed each under a microscope at × 25 magnification to determine the presence of cracks. The absence/presence of cracks was recorded, and the data were analyzed with a Chi-square test. The significance level was set at P < 0.05. Results: Instrumentation with Reciproc produced significantly more complete cracks than WaveOne and TFA (P = 0.032). The TFA system produced significantly less cracks then the Reciproc and WaveOne systems apically (P = 0.004). Conclusions: Within the limits of this study, the TFA system caused less cracks then the full reciprocating system (Reciproc and WaveOne). Single-file reciprocating files produced significantly more incomplete dentinal cracks than full-sequence adaptive rotary motion.
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Affiliation(s)
- Richard M Gergi
- Department of Endodontics, Faculty of Dentistry, Saint Joseph University, Beirut, Lebanon
| | - Nada E Osta
- Department of Prosthodontics, Faculty of Dentistry, Saint Joseph University, Beirut, Lebanon
| | - Alfred S Naaman
- Department of Endodontics, Faculty of Dentistry, Saint Joseph University, Beirut, Lebanon
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A. Versiani M, Souza E, De-Deus G. Critical appraisal of studies on dentinal radicular microcracks in endodontics: methodological issues, contemporary concepts, and future perspectives. ACTA ACUST UNITED AC 2015. [DOI: 10.1111/etp.12091] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Shemesh H. Endodontic instrumentation and root filling procedures: effect on mechanical integrity of dentin. ACTA ACUST UNITED AC 2015. [DOI: 10.1111/etp.12084] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Jamleh A, Adorno CG, Ebihara A, Suda H. Effect of nickel titanium file design on the root surface strain and apical microcracks. AUST ENDOD J 2015; 42:25-31. [DOI: 10.1111/aej.12116] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ahmed Jamleh
- Endodontics; College of Dentistry; King Saud bin Abdulaziz University for Health Sciences; King Abdulaziz Medical City, National Guard Health Affairs; Riyadh Saudi Arabia
| | - Carlos G. Adorno
- Endodontics and Research Methodology; School of Dentistry; National University of Asuncion; Asuncion Paraguay
| | - Arata Ebihara
- Department of Pulp Biology and Endodontics; Division of Oral Health Sciences; Graduate School of Medical and Dental Sciences; Tokyo Medical and Dental University; Tokyo Japan
| | - Hideaki Suda
- Department of Pulp Biology and Endodontics; Division of Oral Health Sciences; Graduate School of Medical and Dental Sciences; Tokyo Medical and Dental University; Tokyo Japan
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Chai H, Tamse A. The Effect of Isthmus on Vertical Root Fracture in Endodontically Treated Teeth. J Endod 2015; 41:1515-9. [DOI: 10.1016/j.joen.2015.04.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2015] [Revised: 03/31/2015] [Accepted: 04/02/2015] [Indexed: 11/24/2022]
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Ceyhanli KT, Erdilek N, Tatar İ, Celik D. Comparison of ProTaper, RaCe and Safesider instruments in the induction of dentinal microcracks: a micro-CT study. Int Endod J 2015; 49:684-9. [DOI: 10.1111/iej.12497] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Accepted: 07/03/2015] [Indexed: 11/27/2022]
Affiliation(s)
- K. T. Ceyhanli
- Department of Endodontics; Faculty of Dentistry; Karadeniz Technical University; Trabzon Turkey
| | - N. Erdilek
- Department of Endodontics; Faculty of Dentistry; Ege University; İzmir Turkey
| | - İ. Tatar
- Department of Anatomy; Faculty of Medicine; Hacettepe University; Ankara Turkey
| | - D. Celik
- Department of Endodontics; Faculty of Dentistry; Karadeniz Technical University; Trabzon Turkey
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Nur BG, Ok E, Altunsoy M, Tanriver M, Capar ID. Fracture strength of roots instrumented with three different single file systems in curved root canals. Eur J Dent 2015; 9:189-193. [PMID: 26038648 PMCID: PMC4439844 DOI: 10.4103/1305-7456.156804] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Objective: The aim of this study was to compare the fracture strength of roots instrumented with three different single file rotary systems in curved mesial root canals of maxillary molars. Materials and Methods: Curvatures of 25°–35° on mesial roots of 60 maxillary molar teeth were sectioned below the cementoenamel junction to obtain roots 11 mm in length. The roots were balanced with respect to buccolingual and mesiodistal diameter and weight. They were distributed into three experimental groups and one control group (no instrumentation) (n = 15): Reciproc rotary file (R25, VDW, Munich, Germany), WaveOne Primary rotary file (Dentsply Tulsa Dental Specialties, Tulsa, UK) and OneShape (Micro-Mega, Besancon, France) rotary file. Vertical load was applied until fracture occurred. Data were statistically analyzed using one-way analysis of variance test (P < 0.05). Results: The mean fracture load was 412 ± 72 Newton (N) for the control group, 395 ± 69 N for the Reciproc group, 373 ± 63 N for the WaveOne group and 332 ± 68 N for the OneShape group. The fracture load differences among three experimental groups were not statistically significant (P > 0.05.) Whereas, the fracture loads of control and OneShape groups were significantly different (P = 0.012). Conclusions: Fracture resistance of the roots instrumented with WaveOne and Reciproc file systems were similar to the control group whereas it was observed that OneShape rotary file systems enhance the fracture strength of standardized curved roots when compared with the control group.
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Affiliation(s)
- Bilge Gulsum Nur
- Departments of Pedodontics, Faculty of Dentistry, Sifa University, Izmir, Turkiye
| | - Evren Ok
- Department of Endodontics, Faculty of Dentistry, Sifa University, Izmir, Turkiye
| | - Mustafa Altunsoy
- Departments of Pedodontics, Faculty of Dentistry, Sifa University, Izmir, Turkiye
| | - Mehmet Tanriver
- Departments of Pedodontics, Faculty of Dentistry, Sifa University, Izmir, Turkiye
| | - Ismail Davut Capar
- Department of Endodontics, Faculty of Dentistry, Katip Çelebi University, Izmir, Turkiye
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Adl A, Sedigh-Shams M, Majd M. The Effect of Using RC Prep during Root Canal Preparation on the Incidence of Dentinal Defects. J Endod 2015; 41:376-9. [DOI: 10.1016/j.joen.2014.11.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2014] [Revised: 11/10/2014] [Accepted: 11/13/2014] [Indexed: 12/11/2022]
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46
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Comparison of Fracture Sites and Post Lengths in Longitudinal Root Fractures. J Endod 2015; 41:159-63. [DOI: 10.1016/j.joen.2014.09.017] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2014] [Revised: 09/18/2014] [Accepted: 09/21/2014] [Indexed: 11/22/2022]
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47
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Effect of the Size of the Apical Enlargement with Rotary Instruments, Single-cone Filling, Post Space Preparation with Drills, Fiber Post Removal, and Root Canal Filling Removal on Apical Crack Initiation and Propagation. J Endod 2015; 41:253-6. [DOI: 10.1016/j.joen.2014.10.012] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Revised: 10/15/2014] [Accepted: 10/18/2014] [Indexed: 11/20/2022]
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Majd B, Majd H, Porter JA, Romberg E, Arola D. Degradation in the fatigue strength of dentin by diamond bur preparations: Importance of cutting direction. J Biomed Mater Res B Appl Biomater 2015; 104:39-49. [PMID: 25611951 DOI: 10.1002/jbm.b.33348] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2014] [Revised: 11/16/2014] [Accepted: 12/02/2014] [Indexed: 11/12/2022]
Abstract
The objectives of this investigation were to evaluate the degradation in fatigue strength of dentin by diamond bur preparations and to identify the importance of cutting direction. Three groups of coronal dentin specimens were prepared from unrestored third molars, including a flaw free "control," and two groups that received a diamond bur cutting treatment performed parallel or perpendicular to the specimen length. The specimens were subjected to static or cyclic flexural loading to failure and the results were compared with data for carbide bur cutting. Under static loading diamond bur cutting resulted in significantly lower flexure strength (p ≤ 0.05) than the control for both cutting directions (from 154 to ∼124 MPa). However, there was no significant difference in the strength between the control and carbide bur treated specimens. Similarly, the fatigue strength of the diamond bur treated specimens was significantly lower (p ≤ 0.0001) than that of the control for both cutting directions. Cutting in the perpendicular direction resulted in nearly 60% reduction to the endurance limit (from 44 to 19 MPa). Based on the results, diamond bur cutting of cavity preparations causes a reduction in the fatigue strength of dentin, regardless of the cutting direction. To maintain the durability of dentin, cavity preparations introduced using diamond burs must be performed with appropriate cutting direction and followed by a finishing pass.
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Affiliation(s)
- B Majd
- Department of Mechanical Engineering, University of Maryland Baltimore County, Baltimore, Maryland
| | - H Majd
- Department of Mechanical Engineering, University of Maryland Baltimore County, Baltimore, Maryland
| | - J A Porter
- Department of Endodontics, Prosthodontics and Operative Dentistry, Dental School, University of Maryland, Baltimore, Maryland
| | - E Romberg
- Department of Endodontics, Prosthodontics and Operative Dentistry, Dental School, University of Maryland, Baltimore, Maryland
| | - D Arola
- Department of Materials Science and Engineering, University of Washington, Seattle, Washington.,Department of Restorative Dentistry, School of Dentistry, University of Washington, Seattle, Washington
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Capar ID, Saygili G, Ergun H, Gok T, Arslan H, Ertas H. Effects of root canal preparation, various filling techniques and retreatment after filling on vertical root fracture and crack formation. Dent Traumatol 2014; 31:302-7. [PMID: 25395069 DOI: 10.1111/edt.12154] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/10/2014] [Indexed: 10/24/2022]
Abstract
AIM To investigate the incidence of cracks in root dentin after rotary instrumentation and filling with cold lateral condensation (CL), single-cone obturation (SC), and warm vertical compaction (WV) and retreatment of each filling system. METHODOLOGY One-hundred sixty mandibular incisors were selected. Twenty teeth were left unprepared and served as a control, and the remaining 140 teeth were instrumented. Twenty teeth were assigned to an only prepared group. The remaining 120 teeth were assigned to three root canal filling groups and three retreatment groups (n = 20), as follows: CL, WV, SC, and retreatment of each filling system. All the roots were sectioned perpendicular to the long axis at 2, 4, 6, and 8 mm from the apex, and the sections were then observed under a stereomicroscope. The absence/presence of cracks and vertical root fractures were recorded, and the data were analyzed with a Pearson's chi-square test (P = 0.05). RESULTS No complete vertical root fractures were observed in the unprepared and only prepared groups. However, vertical fractures were observed in the filling and retreatment groups. There were significantly more cracks in the retreatment after WV group than the other groups, with the exception of the retreatment after SC, WV, and CL resulted in significantly more cracks than the only prepared and SC. CONCLUSIONS The filling techniques (except SC) caused more cracks than preparation only. The SC caused fewer cracks compared to the other filling techniques. The retreatment following the different filling techniques (except CL) caused more cracks than the original fillings.
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Affiliation(s)
- Ismail Davut Capar
- Department of Endodontics, Faculty of Dentistry, İzmir Katip Çelebi University, İzmir, Turkey
| | - Gokhan Saygili
- Department of Endodontics, Faculty of Dentistry, İzmir Katip Çelebi University, İzmir, Turkey
| | - Hazal Ergun
- Department of Endodontics, Faculty of Dentistry, İzmir Katip Çelebi University, İzmir, Turkey
| | - Tuba Gok
- Department of Endodontics, Faculty of Dentistry, İzmir Katip Çelebi University, İzmir, Turkey
| | - Hakan Arslan
- Department of Endodontics, Faculty of Dentistry, Atatürk University, Erzurum, Turkey
| | - Huseyin Ertas
- Department of Endodontics, Faculty of Dentistry, İzmir Katip Çelebi University, İzmir, Turkey
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Arias A, Lee YH, Peters CI, Gluskin AH, Peters OA. Comparison of 2 Canal Preparation Techniques in the Induction of Microcracks: A Pilot Study with Cadaver Mandibles. J Endod 2014; 40:982-5. [DOI: 10.1016/j.joen.2013.12.003] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2013] [Revised: 11/30/2013] [Accepted: 12/05/2013] [Indexed: 10/25/2022]
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