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Kalashnikova GO, Krivovichev SV, Yakovenchuk VN, Selivanova EA, Avdontceva MS, Ivanyuk GY, Pakhomovsky YA, Gryaznova DV, Kabanova NA, Morkhova YA, Sinel’shchikova OY, Bocharov VN, Nikolaev AI, Goychuk OF, Volkov SN, Panikorovskii TL. The AM-4 Family of Layered Titanosilicates: Single-Crystal-to-Single-Crystal Transformation, Synthesis and Ionic Conductivity. Materials (Basel) 2023; 17:111. [PMID: 38203965 PMCID: PMC10780191 DOI: 10.3390/ma17010111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2023] [Revised: 11/08/2023] [Accepted: 11/27/2023] [Indexed: 01/12/2024]
Abstract
Flexible crystal() structures, which exhibit() single-crystal()-to-single-crystal() (SCSC) transformations(), are attracting attention() in many applied aspects: magnetic() switches, catalysis, ferroelectrics and sorption. Acid treatment() for titanosilicate material() AM-4 and natural() compounds with the same structures led to SCSC transformation() by loss() Na+, Li+ and Zn2+ cations with large structural() changes (20% of the unit()-cell() volume()). The conservation() of crystallinity through complex() transformation() is possible due() to the formation() of a strong hydrogen bonding() system(). The mechanism() of transformation() has been characterized using single-crystal() X-ray() diffraction analysis(), powder() diffraction, Rietvield refinement, Raman spectroscopy and electron microscopy. The low migration() energy() of cations in the considered materials() is confirmed using bond()-valence and density() functional() theory() calculations, and the ion conductivity of the AM-4 family's materials() has been experimentally verified.
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Affiliation(s)
- Galina O. Kalashnikova
- Laboratory for Synthesis and Research of the Properties of Mineral-Like Functional Materials, Nanomaterial Research Center of the Kola Science Centre, Russian Academy of Sciences, Fersmana str. 14, 184209 Apatity, Russia; (G.O.K.); (S.V.K.); (V.N.Y.); (E.A.S.); (G.Y.I.); (Y.A.P.); (D.V.G.); (A.I.N.); (O.F.G.)
| | - Sergey V. Krivovichev
- Laboratory for Synthesis and Research of the Properties of Mineral-Like Functional Materials, Nanomaterial Research Center of the Kola Science Centre, Russian Academy of Sciences, Fersmana str. 14, 184209 Apatity, Russia; (G.O.K.); (S.V.K.); (V.N.Y.); (E.A.S.); (G.Y.I.); (Y.A.P.); (D.V.G.); (A.I.N.); (O.F.G.)
- Department of Crystallography, Institute of Earth Sciences, St. Petersburg State University, 7–9 University Emb., 199034 St. Petersburg, Russia;
| | - Victor N. Yakovenchuk
- Laboratory for Synthesis and Research of the Properties of Mineral-Like Functional Materials, Nanomaterial Research Center of the Kola Science Centre, Russian Academy of Sciences, Fersmana str. 14, 184209 Apatity, Russia; (G.O.K.); (S.V.K.); (V.N.Y.); (E.A.S.); (G.Y.I.); (Y.A.P.); (D.V.G.); (A.I.N.); (O.F.G.)
- Geological Institute, Kola Science Center of Russian Academy of Sciences, 14 Fersman Street, 184200 Apatity, Russia
| | - Ekaterina A. Selivanova
- Laboratory for Synthesis and Research of the Properties of Mineral-Like Functional Materials, Nanomaterial Research Center of the Kola Science Centre, Russian Academy of Sciences, Fersmana str. 14, 184209 Apatity, Russia; (G.O.K.); (S.V.K.); (V.N.Y.); (E.A.S.); (G.Y.I.); (Y.A.P.); (D.V.G.); (A.I.N.); (O.F.G.)
- Geological Institute, Kola Science Center of Russian Academy of Sciences, 14 Fersman Street, 184200 Apatity, Russia
| | - Margarita S. Avdontceva
- Department of Crystallography, Institute of Earth Sciences, St. Petersburg State University, 7–9 University Emb., 199034 St. Petersburg, Russia;
| | - Gregory Yu. Ivanyuk
- Laboratory for Synthesis and Research of the Properties of Mineral-Like Functional Materials, Nanomaterial Research Center of the Kola Science Centre, Russian Academy of Sciences, Fersmana str. 14, 184209 Apatity, Russia; (G.O.K.); (S.V.K.); (V.N.Y.); (E.A.S.); (G.Y.I.); (Y.A.P.); (D.V.G.); (A.I.N.); (O.F.G.)
| | - Yakov A. Pakhomovsky
- Laboratory for Synthesis and Research of the Properties of Mineral-Like Functional Materials, Nanomaterial Research Center of the Kola Science Centre, Russian Academy of Sciences, Fersmana str. 14, 184209 Apatity, Russia; (G.O.K.); (S.V.K.); (V.N.Y.); (E.A.S.); (G.Y.I.); (Y.A.P.); (D.V.G.); (A.I.N.); (O.F.G.)
- Geological Institute, Kola Science Center of Russian Academy of Sciences, 14 Fersman Street, 184200 Apatity, Russia
| | - Darya V. Gryaznova
- Laboratory for Synthesis and Research of the Properties of Mineral-Like Functional Materials, Nanomaterial Research Center of the Kola Science Centre, Russian Academy of Sciences, Fersmana str. 14, 184209 Apatity, Russia; (G.O.K.); (S.V.K.); (V.N.Y.); (E.A.S.); (G.Y.I.); (Y.A.P.); (D.V.G.); (A.I.N.); (O.F.G.)
| | - Natalya A. Kabanova
- Laboratory of Nature-Inspired Technologies and Environmental Safety of the Arctic, Nanomaterial Research Center of the Kola Science Centre, Russian Academy of Sciences, Fersmana str. 14, 184209 Apatity, Russia;
- Samara Center for Theoretical Materials Science, Samara State Technical University, Molodogvardeyskaya Str. 244, 443100 Samara, Russia
| | - Yelizaveta A. Morkhova
- Institute of Experimental Medicine and Biotechnology, Samara State Medical University, Chapayevskaya Srt. 89, 443099 Samara, Russia;
| | - Olga Yu. Sinel’shchikova
- Laboratory of Physicochemical Design and Synthesis of Functional Materials, Institute of Silicate Chemistry of Russian Academy of Sciences, 2 Adm. Makarova, 199034 St. Petersburg, Russia;
| | - Vladimir N. Bocharov
- Geo Environmental Centre “Geomodel”, St. Petersburg State University, Universitetskaya nab., 7/9, 199034 St. Petersburg, Russia;
| | - Anatoly I. Nikolaev
- Laboratory for Synthesis and Research of the Properties of Mineral-Like Functional Materials, Nanomaterial Research Center of the Kola Science Centre, Russian Academy of Sciences, Fersmana str. 14, 184209 Apatity, Russia; (G.O.K.); (S.V.K.); (V.N.Y.); (E.A.S.); (G.Y.I.); (Y.A.P.); (D.V.G.); (A.I.N.); (O.F.G.)
- Tananaev Institute of Chemistry of the Kola Science Centre, Russian Academy of Sciences, Academic Town, 26a, 184209 Apatity, Russia
| | - Olga F. Goychuk
- Laboratory for Synthesis and Research of the Properties of Mineral-Like Functional Materials, Nanomaterial Research Center of the Kola Science Centre, Russian Academy of Sciences, Fersmana str. 14, 184209 Apatity, Russia; (G.O.K.); (S.V.K.); (V.N.Y.); (E.A.S.); (G.Y.I.); (Y.A.P.); (D.V.G.); (A.I.N.); (O.F.G.)
- Laboratory of Nature-Inspired Technologies and Environmental Safety of the Arctic, Nanomaterial Research Center of the Kola Science Centre, Russian Academy of Sciences, Fersmana str. 14, 184209 Apatity, Russia;
| | - Sergei N. Volkov
- Laboratory of Arctic Mineralogy and Material Sciences, Nanomaterial Research Center of the Kola Science Centre, Russian Academy of Sciences, Fersmana str. 14, 184209 Apatity, Russia;
| | - Taras L. Panikorovskii
- Laboratory of Nature-Inspired Technologies and Environmental Safety of the Arctic, Nanomaterial Research Center of the Kola Science Centre, Russian Academy of Sciences, Fersmana str. 14, 184209 Apatity, Russia;
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Matalon N, Vergaelen E, Shani S, Dar S, Mekori-Domachevsky E, Segal-Gavish H, Hochberg Y, Gothelf D, Swillen A, Taler M. The relationship between oxidative stress and psychotic disorders in 22q11.2 deletion syndrome. Brain Behav Immun 2023; 114:16-21. [PMID: 37541396 DOI: 10.1016/j.bbi.2023.07.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 07/26/2023] [Accepted: 07/30/2023] [Indexed: 08/06/2023] Open
Abstract
BACKGROUND 22q11.2 Deletion syndrome (22q11.2DS) is the most common microdeletion syndrome in humans. This condition is associated with a wide range of symptoms including immune and neuropsychiatric disorders. Notably, psychotic disorders including schizophrenia have a prevalence of ∼ 30%. A growing body of evidence indicates that neuroinflammation and oxidative stress (OS) play a role in the pathophysiology of schizophrenia. In this study, we aim to assess the interaction between 22q11.2DS, OS and schizophrenia. METHODS Blood samples were collected from 125 participants (including individuals with 22q11.2DS [n = 73] and healthy controls [n = 52]) from two sites: Sheba Medical Center in Israel, and University Hospital Gasthuisberg in Belgium. Baseline OS levels were evaluated by measuring Myeloperoxidase (MPO) activity. A sub-sample of the Israeli sample (n = 50) was further analyzed to examine survival of Peripheral Blood Mononuclear Cells (PBMCs) following induction of OS using vitamin K3. RESULTS The levels of MPO were significantly higher in all individuals with 22q11.2DS, compared to healthy controls (0.346 ± 0.256 vs. 0.252 ± 0.238, p =.004). In addition, when comparing to healthy controls, the PBMCs of individuals with 22q11.2DS were less resilient to induced OS, specifically the group diagnosed with psychotic disorder (0.233 ± 0.206 for the 22q11.2DS individuals with psychotic disorders, 0.678 ± 1.162 for the 22q11.2DS individuals without psychotic disorders, and 1.428 ± 1.359 for the healthy controls, p =.003, η2 = 0.207). CONCLUSIONS Our results suggest that dysregulation of OS mechanisms may play a role in the pathophysiology of the 22q11.2DS phenotype. The 22q11.2DS individuals with psychotic disorders were more sensitive to induction of OS, but did not present significantly different levels of OS at baseline. These results may be due to the effect of antipsychotic treatment administered to this sup-group. By elucidating novel molecular pathways, early identification of biochemical risk markers for 22q11.2DS and psychotic disorders can be detected. This can ultimately pave the way to the design of early and more precise interventions of individuals with 22q11.2DS.
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Affiliation(s)
- Noam Matalon
- Behavioral Neurogenetics Center, The Edmond and Lily Safra Children's Hospital, Sheba Medical Center, Tel Hashomer, Israel; Pediatric Molecular Psychiatry Laboratory, Sheba Medical Center, Tel-Aviv, Israel; Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Elfi Vergaelen
- Center for Human Genetics, University Hospital Gasthuisberg, Leuven, Belgium
| | - Shachar Shani
- Behavioral Neurogenetics Center, The Edmond and Lily Safra Children's Hospital, Sheba Medical Center, Tel Hashomer, Israel; Pediatric Molecular Psychiatry Laboratory, Sheba Medical Center, Tel-Aviv, Israel; Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
| | - Shira Dar
- Pediatric Molecular Psychiatry Laboratory, Sheba Medical Center, Tel-Aviv, Israel
| | - Ehud Mekori-Domachevsky
- Behavioral Neurogenetics Center, The Edmond and Lily Safra Children's Hospital, Sheba Medical Center, Tel Hashomer, Israel; Pediatric Molecular Psychiatry Laboratory, Sheba Medical Center, Tel-Aviv, Israel; Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Hadar Segal-Gavish
- Behavioral Neurogenetics Center, The Edmond and Lily Safra Children's Hospital, Sheba Medical Center, Tel Hashomer, Israel; Pediatric Molecular Psychiatry Laboratory, Sheba Medical Center, Tel-Aviv, Israel
| | | | - Doron Gothelf
- Behavioral Neurogenetics Center, The Edmond and Lily Safra Children's Hospital, Sheba Medical Center, Tel Hashomer, Israel; Pediatric Molecular Psychiatry Laboratory, Sheba Medical Center, Tel-Aviv, Israel; Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel; Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
| | - Ann Swillen
- Center for Human Genetics, University Hospital Gasthuisberg, Leuven, Belgium; Department of Human Genetics, KU Leuven, Belgium
| | - Michal Taler
- Pediatric Molecular Psychiatry Laboratory, Sheba Medical Center, Tel-Aviv, Israel; Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
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Kajikawa M, Imaizumi N, Machii S, Nakamura T, Harigane N, Kimura M, Miyano K, Ishido S, Kanamoto T. Kaposi's sarcoma-associated herpesvirus ubiquitin ligases downregulate cell surface expression of l-selectin. J Gen Virol 2021; 102. [PMID: 34726593 DOI: 10.1099/jgv.0.001678] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Kaposi's sarcoma-associated herpesvirus (KSHV) is an oncogenic etiological factor for Kaposi's sarcoma and primary effusion lymphoma in immunocompromised patients. KSHV utilizes two immune evasion E3 ubiquitin ligases, namely K3 and K5, to downregulate the expression of antigen-presenting molecules and ligands of natural killer (NK) cells in the host cells through an ubiquitin-dependent endocytic mechanism. This allows the infected cells to evade surveillance and elimination by cytotoxic lymphocytes and NK cells. The number of host cell molecular substrates reported for these ubiquitin ligases is limited. The identification of novel substrates for these ligases will aid in elucidating the mechanism underlying immune evasion of KSHV. This study demonstrated that K5 downregulated the cell surface expression of l-selectin, a C-type lectin-like adhesion receptor expressed in the lymphocytes. Tryptophan residue located at the centre of the E2-binding site in the K5 RINGv domain was essential to downregulate l-selectin expression. Additionally, the lysine residues located at the cytoplasmic tail of l-selectin were required for the K5-mediated downregulation of l-selectin. K5 promoted the degradation of l-selectin through polyubiquitination. These results suggest that K5 downregulates l-selectin expression on the cell surface by promoting polyubiquitination and ubiquitin-dependent endocytosis, which indicated that l-selectin is a novel substrate for K5. Additionally, K3 downregulated l-selectin expression. The findings of this study will aid in the elucidation of a novel immune evasion mechanism in KSHV.
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Affiliation(s)
- Mizuho Kajikawa
- Laboratory of Microbiology, Showa Pharmaceutical University, 3-3165 Higashi-Tamagawagakuen, Machida, Tokyo 194-8543, Japan
| | - Nanae Imaizumi
- Laboratory of Microbiology, Showa Pharmaceutical University, 3-3165 Higashi-Tamagawagakuen, Machida, Tokyo 194-8543, Japan
| | - Shiho Machii
- Laboratory of Microbiology, Showa Pharmaceutical University, 3-3165 Higashi-Tamagawagakuen, Machida, Tokyo 194-8543, Japan
| | - Tomoka Nakamura
- Laboratory of Microbiology, Showa Pharmaceutical University, 3-3165 Higashi-Tamagawagakuen, Machida, Tokyo 194-8543, Japan
| | - Nana Harigane
- Laboratory of Microbiology, Showa Pharmaceutical University, 3-3165 Higashi-Tamagawagakuen, Machida, Tokyo 194-8543, Japan
| | - Minako Kimura
- Laboratory of Microbiology, Showa Pharmaceutical University, 3-3165 Higashi-Tamagawagakuen, Machida, Tokyo 194-8543, Japan
| | - Kei Miyano
- Department of Biochemistry, Kawasaki Medical School, 577 Matsushima, Kurashiki, Okayama 701-0192, Japan
| | - Satoshi Ishido
- Department of Microbiology, Hyogo College of Medicine, 1-1 Mukogawa-cho, Nishinomiya, Hyogo 663-8501, Japan
| | - Taisei Kanamoto
- Laboratory of Microbiology, Showa Pharmaceutical University, 3-3165 Higashi-Tamagawagakuen, Machida, Tokyo 194-8543, Japan
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Chreifi G, Chen S, Jensen GJ. Rapid tilt-series method for cryo-electron tomography: Characterizing stage behavior during FISE acquisition. J Struct Biol 2021; 213:107716. [PMID: 33713788 DOI: 10.1016/j.jsb.2021.107716] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Revised: 03/02/2021] [Accepted: 03/05/2021] [Indexed: 10/21/2022]
Abstract
We and others recently developed rapid tilt-series acquisition methods for cryo-electron tomography on a Titan Krios G3i equipped with a single axis holder and a K-series direct electron detector and showed that one of these, the fast-incremental single exposure (FISE) method, significantly accelerates tilt-series acquisition when compared to traditional methods while preserving the quality of the images. Here, we characterize the behavior of our single axis holder in detail during a FISE experiment to optimally balance data quality with speed. We explain our methodology in detail so others can characterize their own stages, and conclude with recommendations for projects with different resolution goals.
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Affiliation(s)
- Georges Chreifi
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, United States
| | - Songye Chen
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, United States; Beckman Institute, California Institute of Technology, Pasadena, CA 91125, United States
| | - Grant J Jensen
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, United States; Beckman Institute, California Institute of Technology, Pasadena, CA 91125, United States; Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84604, United States.
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Eisenstein F, Danev R, Pilhofer M. Improved applicability and robustness of fast cryo-electron tomography data acquisition. J Struct Biol 2019; 208:107-14. [PMID: 31425790 DOI: 10.1016/j.jsb.2019.08.006] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Revised: 08/12/2019] [Accepted: 08/14/2019] [Indexed: 12/13/2022]
Abstract
Tilt series acquisition in less than 5 min per target. Robust compensation of specimen shifts in x, y and z. Applicability to new (single-tilt axis) and old (dual-tilt axis) microscope stages. Sub-nanometer subtomogram average with data collected in <50 min.
The power of cryo-electron tomography (cryoET) lies in its capability to characterize macromolecules in their cellular context. Structure determination by cryoET, however, is time-consuming compared to single particle approaches. A recent study reported significant acceleration of data acquisition by a fast-incremental single-exposure (FISE) tilt series scheme. Here we improved the method and evaluated its efficiency and performance. We show that (1) FISE combined with the latest generation of direct electron detectors speeds up collection considerably, (2) previous generation (pre-2017) double-tilt axis Titan Krios holders are also suitable for FISE data acquisition, (3) x, y and z-specimen shifts can be compensated for, and (4) FISE tilt series data can generate averages of sub-nanometer resolution. These advances will allow for a widespread adoption of cryoET for high-throughput in situ studies and high-resolution structure determination across different biological research disciplines.
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Shen SM, Deng M, Wang PP, Chen XM, Zheng LW, Li HL. Deformation and fracture of K3 rotary nickel-titanium endodontic instruments after clinical use. Int Endod J 2015; 49:1088-1094. [PMID: 26466821 DOI: 10.1111/iej.12561] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2014] [Accepted: 10/11/2015] [Indexed: 02/05/2023]
Abstract
AIM The aim was to evaluate the incidence and type of defects that occurred with K3 rotary nickel-titanium instruments during routine clinical use. METHODOLOGY A total of 2397 K3 (G-PACKS, SybronEndo, West Collins, Orange, CA, USA) instruments were collected from a graduate endodontic clinic over 21 months. All the instruments were limited to a maximum use of 30 canal preparations. The collected instruments were measured by a digital caliper to determine whether any fractures had occurred and then were visually inspected for deformation and fracture under a stereomicroscope. The surfaces of fractured instruments were further evaluated under a scanning electron microscope. Data were analysed using chi-square test and Kruskal-Wallis test. RESULTS The incidence of instrument defect was 5.63%, consisting of 3.59% fractures and 2.05% deformations. The defect rates of 0.04 and 0.06 files were statistically higher than the other taper groups (P < 0.003) except for 0.08 files (P > 0.05). For the fractured instruments, 63.95% failed from flexural fatigue, whilst 36.05% failed from torsion. CONCLUSION Flexural fracture was the major mode of fracture for instruments with larger taper. A routine check for instrument integrity particularly for 0.04 and 0.06 files at high magnification is recommended after each clinical use.
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Affiliation(s)
- S M Shen
- Department of Endodontic and Operative Dentistry, Tianjin Stomatological Hospital, Tianjin, China.,State Key Laboratory of Oral Diseases, Sichuan University, Chengdu, China
| | - M Deng
- State Key Laboratory of Oral Diseases, Sichuan University, Chengdu, China.,Department of Oral Biology, School of Dentistry, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - P P Wang
- State Key Laboratory of Oral Diseases, Sichuan University, Chengdu, China.,Department of Periodontology, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China
| | - X M Chen
- State Key Laboratory of Oral Diseases, Sichuan University, Chengdu, China. .,Department of Endodontic and Operative Dentistry, West China Hospital of Stomatology, Chengdu, China.
| | - L W Zheng
- State Key Laboratory of Oral Diseases, Sichuan University, Chengdu, China.,Department of Endodontic and Operative Dentistry, West China Hospital of Stomatology, Chengdu, China
| | - H L Li
- Department of Endodontic and Operative Dentistry, West China Hospital of Stomatology, Chengdu, China
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Madani ZS, Goudarzipor D, Haddadi A, Saeidi A, Bijani A. A CBCT Assessment of Apical Transportation in Root Canals Prepared with Hand K-Flexofile and K3 Rotary Instruments. Iran Endod J 2015; 10:44-8. [PMID: 25598809 PMCID: PMC4293580] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Revised: 09/14/2014] [Accepted: 10/04/2014] [Indexed: 10/30/2022]
Abstract
INTRODUCTION Apical transportation changes the physical shape and physiologic environment of the root canal terminus. The aim of the present experimental study was to determine the extent of apical transportation after instrumentation with hand K-Flexofile and K3 rotary instruments by means of cone-beam computed tomography (CBCT). METHODS AND MATERIALS Forty mesiobuccal root canals of maxillary first molars, with 19-22 mm length and 20-40(°) canal curvature, were selected and assigned into two preparation groups. The first group was prepared with K-Flexofile with passive step-back technique and the second group was prepared with K3 rotary instruments. Pre and post instrumentation CBCT images were taken under similar conditions. The amount of root canal transportation was evaluated by Mann-Whitney U test and the chi-square test was used for the qualitative evaluation. RESULTS The amounts of apical canal transportation with the K3 and K-Flexofile instruments were 0.105±0.088 and 0.150±0.127 mm, respectively with no statistically significant differences. In the manual technique, 25% of the canals had no apical transportation; while 30% of the canals in the K3 group were transportation free. CONCLUSION Both systems were able to preserve the initial curvature of the canals and both had sufficient accuracy. Preparation with K3 rotary instruments resulted in apical transportation similar to that of K-Flexofile.
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Affiliation(s)
- Zahra Sadat Madani
- Department of Endodontics, Dental School, Babol University of Medical Sciences, Babol, Iran;
| | - Daryoush Goudarzipor
- Department of oral and Maxillofacial Radiology, Dental School, Tehran University of Medical Sciences, Tehran, Iran
| | - Azam Haddadi
- Department of Endodontics, Dental School, Mazandaran University of Medical Sciences, Sari, Iran;
| | - Akam Saeidi
- Endodontist, Private Practice,Sari, Iran; ,Corresponding author: Akam Saeidi, Valiasr Building, Pasdaran Blvd., Imam Sq., Sari, Iran. Tel: +98-918 3714397, E-mail:
| | - Ali Bijani
- Non-Communicable Pediatric Diseases Research Center, Babol University of Medical Sciences, Babol, Iran
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Olivieri JG, Stöber E, García Font M, González JA, Bragado P, Roig M, Duran-Sindreu F. In vitro comparison in a manikin model: increasing apical enlargement with K3 and K3XF rotary instruments. J Endod 2014; 40:1463-7. [PMID: 25146034 DOI: 10.1016/j.joen.2014.02.023] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2014] [Revised: 02/27/2014] [Accepted: 02/28/2014] [Indexed: 11/22/2022]
Abstract
INTRODUCTION The aim of the study was to compare the K3 and K3XF systems (SybronEndo, Glendora, CA) after 1 and 2 uses by evaluating apical transportation, working length loss, and working time in a manikin model. METHODS Mesial canals of 40 extracted first mandibular molars were instrumented. Radiographs taken after instrumentation with #25, #30, #35, and #40 files were superimposed on the preoperative image in both mesiodistal and buccolingual angulations. AutoCAD (Autodesk Inc, San Rafael, CA) was used to measure working length loss and apical transportation at 0, 0.5, and 1 mm from the working length (WL). The working time was measured. Group comparison was analyzed using post hoc Tukey honestly significant difference tests (P < .05). RESULTS No significant differences were found in apical transportation, working length loss between K3 and K3XF systems, or between the number of uses. Significant differences were found when canal enlargement was performed to a #35-40 (P < .05). K3 instrumentation performed significantly faster (29.6 ± 15.4) than with the K3XF system (40.2 ± 17.7) (P < .05). No differences were observed in working time when comparing the number of uses. CONCLUSIONS K3 and R-phase K3XF rotary systems shaped curved root canals safely with minimal apical transportation, even up to a 40/04 file.
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H K S, T S S, Goel BR, T N N, Bhandi SH. Quantitative assessment of apical debris extrusion and intracanal debris in the apical third, using hand instrumentation and three rotary instrumentation systems. J Clin Diagn Res 2014; 8:206-10. [PMID: 24701536 DOI: 10.7860/jcdr/2014/7353.4061] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2013] [Accepted: 12/22/2013] [Indexed: 11/24/2022]
Abstract
INTRODUCTION Decreased apical extrusion of debris and apical one third debris have strong implications for decreased incidence of postoperative inflammation and pain. Thus, the aim of this study was to assess quantitatively the apical extrusion of debris and intracanal debris in the apical third during root canal instrumentation using hand and three different types of rotary instruments. METHODOLOGY Sixty freshly extracted single rooted human teeth were randomly divided into four groups. Canal preparation was done using step-back with hand instrumentation, crown-down technique with respect to ProTaper and K3, and hybrid technique with LightSpeed LSX. Irrigation was done with NaOCl, EDTA, and normal saline and for final irrigation, EndoVac system was used. The apically extruded debris was collected on the pre-weighed Millipore plastic filter disk and weighed using microbalance. The teeth were submitted to the histological processing. Sections from the apical third were analyzed by a trinocular research microscope that was coupled to a computer where the images were captured and analyzed using image proplus V4.1.0.0 software. The mean weight of extruded debris for each group and intracanal debris in the root canal was statistically analyzed by a Kruskal-Wallis one-way analysis of variance and Mann-Whitney U test. RESULTS The result showed that, hand instrumentation using K files showed the highest amount of debris extrusion apically when compared to ProTaper, K3 and LightSpeed LSX. The result also showed that there was no statistically significant difference between the groups in relation to presence of intracanal debris in the apical one third. CONCLUSION Based on the results, all instrumentation techniques produced debris extrusion. The engine driven Ni-Ti systems extruded significantly less apical debris than hand instrumentation. There was no statistically significant difference between the groups in relation to presence of intracanal debris in the apical one third.
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Affiliation(s)
- Sowmya H K
- Lecturer, Department of Conservative Dentistry and Endodontics, JSS Dental College and Hospital , Mysore, Karnataka, India
| | - Subhash T S
- Professor and HOD, Department of Dentistry MMC & RI, K. R. Hospital , Mysore, Karnataka, India
| | - Beena Rani Goel
- Consultant, Conservative Dentist and Endodontist, Belgaum, India
| | - Nandini T N
- Reader, Department of Conservative Dentistry and Endodontics, Bapuji Dental College and Hospital , Davangere, India
| | - Shilpa H Bhandi
- Assistant Professor, Department of Conservative Dentistry and Endodontics, M S Ramaiah Dental College and Hospital , Bangalore, Karnataka-560054, India
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Maitin N, Arunagiri D, Brave D, Maitin SN, Kaushik S, Roy S. An ex vivo comparative analysis on shaping ability of four NiTi rotary endodontic instruments using spiral computed tomography. J Conserv Dent 2013; 16:219-23. [PMID: 23833454 PMCID: PMC3698584 DOI: 10.4103/0972-0707.111318] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2012] [Revised: 12/12/2012] [Accepted: 01/18/2013] [Indexed: 11/24/2022] Open
Abstract
Objective: Analysis of shaping ability of four different rotary endodontic instruments using spiral computed tomography (CT). Materials and Methods: Eighty freshly extracted human mandibular first molars were used in the present study. Samples were randomly divided into four experimental groups with twenty samples in each group. Images of mesiobuccal canal of each sample were obtained pre- and post-operatively using spiral CT. All samples were prepared using their respective endodontic file systems (group I - ProTaper, group II - K3, group III - RaCe, and group IV - Mtwo). Image analyses were done using image analysis software for evaluation of canal transportation and centering ability. Data was then statistically analyzed using analysis of variance. Results: There was no statistically significance in transportation in their intergroup difference at any of the three locations (coronal, middle, and apical third). In centering ability there was no statistically significance in the coronal and middle third of the intergroup. However, there was a statistically significance of (P = 0.044) at the apical third between all the groups. Conclusion: Canals prepared with ProTaper had more canal transportation at all the three levels of root canal (coronal, middle, and apical third). Canals prepared with Mtwo were well centered at coronal and middle third whereas with RaCe canals were centered only at the apical third. All instruments showed some degree of canal aberrations in terms of shaping ability.
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Affiliation(s)
- Nitin Maitin
- Department of Conservative Dentistry and Endodontics, Buddha Institute of Dental Sciences and Hospital, Kankarbagh, Patna, India
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George GK, Sanjeev K, Sekar M. An in vitro evaluation of the effect of deep dry cryotreatment on the cutting efficiency of three rotary nickel titanium instruments. J Conserv Dent 2011; 14:169-72. [PMID: 21814360 PMCID: PMC3146111 DOI: 10.4103/0972-0707.82627] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2010] [Revised: 10/23/2010] [Accepted: 11/19/2010] [Indexed: 11/04/2022] Open
Abstract
CONTEXT Cryogenic methods have been used to increase the strength of metals. AIM The aim of this study was to evaluate the effect of deep dry cryotherapy on the cyclic fatigue resistance of rotary nickel titanium instruments. MATERIALS AND METHODS Twenty K3, RaCe and Hero Shaper nickel titanium instruments, size 25, 0.06 taper, were taken for this study. Ten files were untreated (control group) and 10 files were deep dry cryogenically treated. Both the untreated and cryotreated files were subjected to cyclic fatigue evaluation. Cyclic fatigue was evaluated as the number of cycles it took for fracture of the instrument within a stainless steel shaping block of specific radius and angle of curvature. STATISTICAL ANALYSIS Mean values were compared between different study groups by using one-way analysis of variance (ANOVA) with P < 0.05 considered as the level of significance. RESULTS The results showed a significant increase in the resistance to cyclic fatigue of deep dry cryotreated NiTi files over untreated files. CONCLUSIONS It may thus be concluded that deep cryotherapy has improved the cyclic fatigue of NiTi rotary endodontic files.
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Affiliation(s)
- Gingu Koshy George
- Department of Conservative Dentistry and Endodontics, Pushpagiri Dental College, Thiruvalla, India
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Boname JM, Lehner PJ. What has the study of the K3 and K5 viral ubiquitin E3 ligases taught us about ubiquitin-mediated receptor regulation? Viruses 2011; 3:118-31. [PMID: 22049306 DOI: 10.3390/v3020118] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2010] [Revised: 01/17/2011] [Accepted: 01/20/2011] [Indexed: 12/29/2022] Open
Abstract
Cells communicate with each other and the outside world through surface receptors, which need to be tightly regulated to prevent both overstimulation and receptor desensitization. Understanding the processes involved in the homeostatic control of cell surface receptors is essential, but we are not alone in trying to regulate these receptors. Viruses, as the ultimate host pathogens, have co-evolved over millions of years and have both pirated and adapted host genes to enable viral pathogenesis. K3 and K5 (also known as MIR1 and MIR2) are viral ubiquitin E3 ligases from Kaposi's Sarcoma Associated Herpesvirus (KSHV) which decrease expression of a number of cell surface receptors and have been used to interrogate cellular processes and improve our understanding of ubiquitin-mediated receptor endocytosis and degradation. In this review, we summarize what has been learned from the study of these viral genes and emphasize their role in elucidating the complexity of ubiquitin in receptor regulation.
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Kustarci A, Akdemir N, Siso SH, Altunbas D. Apical extrusion of intracanal debris using two engine driven and step-back instrumentation techniques: an in-vitro study. Eur J Dent 2008; 2:233-9. [PMID: 19212528 PMCID: PMC2634776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
OBJECTIVES The purpose of this study was to compare in-vitro the amount of debris extruded apically from extracted teeth, using K3, Protaper rotary instruments and manual step-back technique. METHODS Forty five human single-rooted mandibular premolar teeth were randomly divided into 3 groups. The teeth in 3 groups were instrumented until reaching the working length with K3, Protaper rotary instruments and K-type stainless steel instruments with manual step-back technique, respectively. Debris extruded from the apical foramen was collected into centrifuge tubes and the amount was determined. The data obtained were analyzed using Kruskal-Wallis one-way analysis of variance and Mann-Whitney U tests, with P=.05 as the level for statistical significance. RESULTS Statistically significant difference was observed between K3, Protaper and step-back groups in terms of debris extrusion (P<.05). Step-back group had the highest mean debris weight, which was significantly different from the K3 and Protaper groups (P<.05). The lowest mean debris weight was related to K3 group, which was significantly different from the Protaper group (P<.05). CONCLUSIONS Based on the results, all instrumentation techniques produced debris extrusion. The engine-driven Ni-Ti systems extruded significantly less apical debris than step-back technique. However, Protaper rotary instruments extruded significantly more debris than K3 rotary instruments.
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Affiliation(s)
- Alper Kustarci
- Cumhuriyet University, Faculty of Dentistry, Department of Endodontics, Sivas, Turkey,Corresponding author: Alper Kustarci, Cumhuriyet University, Faculty of Dentistry, Department of Endodontics, Sivas, Turkey. Phone: +90 346 2191010/2764 Fax: +90 346 2191237 E-mail:
| | - Neslihan Akdemir
- Cumhuriyet University, Faculty of Dentistry, Department of Endodontics, Sivas, Turkey
| | - Seyda Herguner Siso
- Cumhuriyet University, Faculty of Dentistry, Department of Restorative Dentistry, Sivas, Turkey
| | - Demet Altunbas
- Cumhuriyet University, Faculty of Dentistry, Department of Endodontics, Sivas, Turkey
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Mohammadzade Akhlaghi N, Khalilak Z, Baradaran Mohajeri L, Sheikholeslami M, Saedi S. Comparison of Canal Preparation Pattern of K3 and ProTaper Rotary Files in Curved Resin Blocks. Iran Endod J 2008; 3:11-6. [PMID: 24171014 PMCID: PMC3808561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/07/2007] [Revised: 11/03/2007] [Accepted: 12/19/2007] [Indexed: 11/16/2022]
Abstract
INTRODUCTION The purpose of this study was to evaluate and compare canal preparation pattern of K3 and ProTaper rotary files in curved resin blocks. MATERIALS AND METHODS Twenty-four resin blocks were used in this experimental study and randomly divided into two groups. Their initial images were scanned. After preparation, their images were scanned again in the same position. Pre and post preparation images were superimposed by Photoshop software and the removed resin was measured in 5 different points, and then analyzed statistically by ANOVA and t-test. RESULTS At O point (orifice), significantly (p<0.05) more outer canal wall was removed in the ProTaper group than in the K3 group. There was no significant difference at any other points of outer wall. Removed material of inner canal wall was not significantly different between the two groups. CONCLUSION Under the condition of this study, both systems performed acceptable preparation pattern except at the beginning of the curve.
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Affiliation(s)
- Nahid Mohammadzade Akhlaghi
- Department of Endodontics, Dental School of Islamic Azad University and Member of Iranian Center for Endodontic Research, Tehran, Iran,Corresponding author at: Nahid Mohammadzade Akhlaghi, Department of Endodontics, Dental School of Islamic Azad University, Number 3, 10th Neyestan St., Passdaran Ave., Tehran, Iran. Tel: +98-9123005775. E-mail:
| | - Zohreh Khalilak
- Department of Endodontics, Dental School of Islamic Azad University and Member of Iranian Center for Endodontic Research, Tehran, Iran
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Khadivi Nia Javan N, Mohajeri Baradaran L, Azimi S. SEM Study of Root Canal Walls Cleanliness after Ni-Ti Rotary and Hand Instrumentation. Iran Endod J 2007; 2:5-10. [PMID: 24348651 PMCID: PMC3863406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/19/2006] [Revised: 10/27/2006] [Accepted: 12/06/2006] [Indexed: 10/25/2022]
Abstract
INTRODUCTION To compare the cleaning effectiveness of K3 and Race NiTi rotary systems with K-Flexo file instruments during the preparation of curved canals in extracted human teeth. MATERIALS AND METHODS A total of 50 root canals of mandibular and maxillary molars with curvatures ranging between 25º and 35 º were divided in three groups of 15 each and 5 as negative control groups. Canals were prepared using a low torque control motor in two rotary groups according to manufacturer's instructions. Conventional Step back with S.S K files was the preparation technique in third group. The amount of debris and smear layer was quantified on the basis of a numerical evaluation scale. The data were statistically analyzed using Chi-Square and Likelihood Ratio tests. RESULTS In general, no significant difference in terms of amount of debris were found among three groups, only in apical zones of Race and K-Flexo file groups a significant difference was detected (P=0.041). Race rotary system left significantly less smear layer than k-Flexo file in the middle (P=0.009) and apical thirds (P=0.012), respectively. K3 significantly achieved higher scores of cleanliness than K-Flexo file in apical third only (P=0.049). No significant difference between Race and K3 rotary groups for residual debris and formed smear layer was detected. CONCLUSION Obtaining higher scores of cleanliness in various regions of the canals, crown down technique and the use of rotary instrumentation seem to be superior to conventional hand instrumentation with step back technique .No significant difference between K3 with three radial lands and Race with three cutting edges in terms of debris and smear layer formation was detected.
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Affiliation(s)
| | - Ladan Mohajeri Baradaran
- Department of Endodontics, Dental school, Islamic Azad University of Medical Sciences, Tehran, Iran
| | - Shahram Azimi
- Department of Endodontics, Dental school, Islamic Azad University of Medical Sciences, Tehran, Iran,Corresponding author at: Shahram Azimi, Department of Endodontics, Dental School, Islamic Azad University of Medical Sciences, Tehran, Iran. Tel: +98-2122564571. Fax: +98-2122564577. E-mail:
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