1
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Rizk M, Niederau C, Florea A, Kiessling F, Morgenroth A, Mottaghy FM, Schneider RK, Wolf M, Craveiro RB. Periodontal ligament and alveolar bone remodeling during long orthodontic tooth movement analyzed by a novel user-independent 3D-methodology. Sci Rep 2023; 13:19919. [PMID: 37964111 PMCID: PMC10646115 DOI: 10.1038/s41598-023-47386-0] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Accepted: 11/13/2023] [Indexed: 11/16/2023] Open
Abstract
The structural process of bone and periodontal ligament (PDL) remodeling during long-term orthodontic tooth movement (OTM) has not been satisfactorily described yet. Although the mechanism of bone changes in the directly affected alveolar bone has been deeply investigated, detailed knowledge about specific mechanism of PDL remodeling and its interaction with alveolar bone during OTM is missing. This work aims to provide an accurate and user-independent analysis of the alveolar bone and PDL remodeling following a prolonged OTM treatment in mice. Orthodontic forces were applied using a Ni-Ti coil-spring in a split-mouth mice model. After 5 weeks both sides of maxillae were scanned by high-resolution micro-CT. Following a precise tooth movement estimation, an extensive 3D analysis of the alveolar bone adjacent to the first molar were performed to estimate the morphological and compositional parameters. Additionally, changes of PDL were characterized by using a novel 3D model approach. Bone loss and thinning, higher connectivity as well as lower bone mineral density were found in both studied regions. Also, a non-uniformly widened PDL with increased thickness was observed. The extended and novel methodology in this study provides a comprehensive insight about the alveolar bone and PDL remodeling process after a long-duration OTM.
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Affiliation(s)
- Marta Rizk
- Department of Orthodontics, University Hospital RWTH Aachen, Pauwelsstr. 30, 52074, Aachen, Germany
| | - Christian Niederau
- Department of Orthodontics, University Hospital RWTH Aachen, Pauwelsstr. 30, 52074, Aachen, Germany
| | - Alexandru Florea
- Department of Nuclear Medicine, University Hospital RWTH Aachen, Aachen, Germany
- Department of Radiology and Nuclear Medicine, Academic Hospital Maastricht, Maastricht, The Netherlands
- School for Cardiovascular Diseases (CARIM), Maastricht University, Maastricht, The Netherlands
| | - Fabian Kiessling
- Institute for Experimental Molecular Imaging, University Clinic Aachen, RWTH Aachen University, Aachen, Germany
| | - Agnieszka Morgenroth
- Department of Nuclear Medicine, University Hospital RWTH Aachen, Aachen, Germany
| | - Felix M Mottaghy
- Department of Nuclear Medicine, University Hospital RWTH Aachen, Aachen, Germany
- Department of Radiology and Nuclear Medicine, Academic Hospital Maastricht, Maastricht, The Netherlands
- School for Cardiovascular Diseases (CARIM), Maastricht University, Maastricht, The Netherlands
| | - Rebekka K Schneider
- Institute of Cell and Tumor Biology, RWTH Aachen University, Aachen, Germany
| | - Michael Wolf
- Department of Orthodontics, University Hospital RWTH Aachen, Pauwelsstr. 30, 52074, Aachen, Germany
| | - Rogerio B Craveiro
- Department of Orthodontics, University Hospital RWTH Aachen, Pauwelsstr. 30, 52074, Aachen, Germany.
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Bousnaki M, Bakopoulou A, Grivas I, Bekiari C, Pich A, Rizk M, Keklikoglou K, Papachristou E, Papadopoulos GC, Kritis A, Mikos AG, Koidis P. Managing Temporomandibular Joint Osteoarthritis by Dental Stem Cell Secretome. Stem Cell Rev Rep 2023; 19:2957-2979. [PMID: 37751010 PMCID: PMC10661765 DOI: 10.1007/s12015-023-10628-9] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/06/2023] [Indexed: 09/27/2023]
Abstract
The potential therapeutic role of the Dental Pulp Stem Cells Secretome (SECR) in a rat model of experimentally induced Temporomandibular Joint (TMJ) Osteoarthritis (OA) was evaluated. Proteomic profiling of the human SECR under specific oxygen tension (5% O2) and stimulation with Tumor Necrosis Factor-alpha (TNF-α) was performed. SECR and respective cell lysates (CL) samples were collected and subjected to SDS-PAGE, followed by LC-MS/MS analysis. The identified proteins were analyzed with Bioinformatic tools. The anti-inflammatory properties of SECR were assessed via an in vitro murine macrophages model, and were further validated in vivo, in a rat model of chemically-induced TMJ-OA by weekly recording of the head withdrawal threshold, the food intake, and the weight change, and radiographically and histologically at 4- and 8-weeks post-treatment. SECR analysis revealed the presence of 50 proteins that were enriched and/or statistically significantly upregulated compared to CL, while many of those proteins were involved in pathways related to "extracellular matrix organization" and "immune system". SECR application in vitro led to a significant downregulation on the expression of pro-inflammatory genes (MMP-13, MMP-9, MMP-3 and MCP-1), while maintaining an increased expression of IL-10 and IL-6. SECR application in vivo had a significant positive effect on all the clinical parameters, resulting in improved food intake, weight, and pain suppression. Radiographically, SECR application had a significant positive effect on trabecular bone thickness and bone density compared to the saline-treated group. Histological analysis indicated that SECR administration reduced inflammation, enhanced ECM and subchondral bone repair and regeneration, thus alleviating TMJ degeneration.
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Affiliation(s)
- Maria Bousnaki
- Department of Prosthodontics, School of Dentistry, Faculty of Health Sciences (FHS), Aristotle University of Thessaloniki (AUTh), 54124, Thessaloniki, Greece
| | - Athina Bakopoulou
- Department of Prosthodontics, School of Dentistry, Faculty of Health Sciences (FHS), Aristotle University of Thessaloniki (AUTh), 54124, Thessaloniki, Greece
| | - Ioannis Grivas
- Department of Anatomy, Histology & Embryology, School of Veterinary Medicine, Aristotle University of Thessaloniki (AUTh), 54124, Thessaloniki, Greece
| | - Chrysa Bekiari
- Department of Anatomy, Histology & Embryology, School of Veterinary Medicine, Aristotle University of Thessaloniki (AUTh), 54124, Thessaloniki, Greece
| | - Andreas Pich
- Research Core Unit Proteomics &, Institute of Toxicology, Hannover Medical School, 30625, Hannover, Germany
| | - Marta Rizk
- Department for Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, 37073, Göttingen, Germany
| | - Kleoniki Keklikoglou
- Institute of Marine Biology, Biotechnology and Aquaculture (IMBBC), Hellenic Centre for Marine Research (HCMR), Thalassocosmos, P.O. Box 2214, 71003, Heraklion, Crete, Greece
- Biology Department, University of Crete, 70013, Heraklion, Crete, Greece
| | - Eleni Papachristou
- Department of Prosthodontics, School of Dentistry, Faculty of Health Sciences (FHS), Aristotle University of Thessaloniki (AUTh), 54124, Thessaloniki, Greece
| | - Georgios C Papadopoulos
- Department of Anatomy, Histology & Embryology, School of Veterinary Medicine, Aristotle University of Thessaloniki (AUTh), 54124, Thessaloniki, Greece
| | - Aristeidis Kritis
- Department of Physiology and Pharmacology, School of Medicine, Faculty of Health Sciences (FHS), Aristotle University of Thessaloniki (AUTh), 54124, Thessaloniki, Greece
| | - Antonios G Mikos
- Department of Bioengineering, Rice University, Houston, TX, 77030, USA
| | - Petros Koidis
- Department of Prosthodontics, School of Dentistry, Faculty of Health Sciences (FHS), Aristotle University of Thessaloniki (AUTh), 54124, Thessaloniki, Greece.
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3
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Rizk M, Mowaka S, Mohamed M, Abou El-Alamin MM. Comparative HPTLC study for simultaneous determination of ivabradine and metoprolol using UV and fluorescence detectors. BMC Chem 2023; 17:113. [PMID: 37710300 PMCID: PMC10500752 DOI: 10.1186/s13065-023-01025-x] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Accepted: 08/29/2023] [Indexed: 09/16/2023] Open
Abstract
New, simple, accurate, sensitive and validated high performance thin layer chromatographic (HPTLC) method coupled with UV absorbance mode and fluorescence (FL) detectors which were used for simultaneous determination of ivabradine (IVA) and metoprolol (MET) in their bulk and pharmaceutical dosage form using TLC silica 60 F254 plates and non-fluorescent TLC silica gel 60 plates. The developing system was chloroform: methanol: formic acid: ammonia (8.5:1.5:0.2:0.1, v/v). Desnitometric analysis in UV absorbance mode was set at λ = 275 nm. While, fluorescence mode was performed with excitation at 260 nm for quantitative simultaneous determination of IVA and MET using optical filter K320. The retention factors values were 0.45 ± 0.05 and 0.89 ± 0.01 of IVA and MET, respectively. UV absorbance mode, linearity was 50.0-600.0 ng/band for IVA and 50.0-900.0 ng/band for MET. For fluorescence mode, the linearity ranges were 18.0-400.0 ng/band and 50.0-550.0 ng/band for IVA and MET; respectively. ICH guidelines were followed in respect to linearity and range, accuracy, precision and selectivity, limit of detection (LOD), limit of quantitation (LOQ) and robustness. The analytical eco-scale, green analytical procedure index (GAPI) and analytical greenness metric tools were used to assess the suggested method. The quantitative proposed method results showed there was no statistically significant difference at 95% confidence when compared to the reported method of high performance liquid chromatography (HPLC).
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Affiliation(s)
- M Rizk
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Helwan University, 11795, Cairo, Egypt
| | - Shereen Mowaka
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Helwan University, 11795, Cairo, Egypt
- Pharmaceutical Chemistry Department, Faculty of Pharmacy, The British University in Egypt, El-Sherouk City, 11837, Egypt
| | - Mariam Mohamed
- Pharmaceutical Chemistry Department, Faculty of Pharmacy, The British University in Egypt, El-Sherouk City, 11837, Egypt.
| | - Maha M Abou El-Alamin
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Helwan University, 11795, Cairo, Egypt
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Roth CE, Niederau C, Radermacher C, Rizk M, Neuss S, Jankowski J, Apel C, Craveiro RB, Wolf M. Knockout of Bone Sialoprotein in Cementoblasts Cell Lines Affects Specific Gene Expression in Unstimulated and Mechanically Stimulated Conditions. Ann Anat 2023; 249:152102. [PMID: 37150306 DOI: 10.1016/j.aanat.2023.152102] [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] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 02/28/2023] [Accepted: 04/17/2023] [Indexed: 05/09/2023]
Abstract
One of the major components in cementum extracellular matrix is bone sialoprotein (BSP). BSP knockout (Ibsp) mice were reported to have a nonfunctional hypo-mineralized cementum, as well as detachment and disorganization of the periodontal ligament tissue. However, studies investigating the influence of Ibsp in cementoblasts are missing yet. This study investigates the influences of Bsp in three cementoblasts cell lines (OCCM.30-WT,IbspΔNterm, and IbspKAE). The mRNA expression of cementoblast and osteoclast markers (Col1a1, Alpl, Ocn, Runx2, Ctsk, Rankl and Opg) and the cell morphology were compared. Additionally, a functional monocyte adhesion assay was performed. To understand the influence of external stimuli, the effect of Ibsp was investigated under static compressive force, mimicking the compression side of orthodontic tooth movement. Cementoblasts with genotype IbspΔNterm and IbspKAE showed slight differences in cell morphology compared to OCCM.30-WT, as well as different gene expression. Under compressive force, the Ibsp cell lines presented expression pattern markers similar to the OCCM.30-WT cell line. However, Cathepsin K was strongly upregulated in IbspΔNterm cementoblasts under compressive force. This study provides insight into the role of BSP in cementoblasts and explores the influence of BSP on periodontal ligament tissues. BSP markers in cementoblasts seem to be involved in the regulation of cementum organization as an important factor for a functional periodontium. In summary, our findings provide a basis for investigations regarding molecular biology interactions of BSP in cementoblasts, and a supporting input for understanding the periodontal and cellular cementum remodeling.
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Affiliation(s)
- Charlotte E Roth
- Department of Orthodontics, Dental Clinic, University of Aachen, 52074 Aachen, Germany; Correspondence to: Pauwelsstr. 30, 52074 Aachen, Germany. E-mail:
| | - Christian Niederau
- Department of Orthodontics, Dental Clinic, University of Aachen, 52074 Aachen, Germany
| | - Chloé Radermacher
- Department of Orthodontics, Dental Clinic, University of Aachen, 52074 Aachen, Germany; Helmholtz Institute for Biomedical Engineering, Bionterface Group, RWTH Aachen University, 52056 Aachen, Germany; Institute of Pathology, RWTH Aachen University Hospital, 52074, Germany
| | - Marta Rizk
- Department of Orthodontics, Dental Clinic, University of Aachen, 52074 Aachen, Germany
| | - Sabine Neuss
- Helmholtz Institute for Biomedical Engineering, Bionterface Group, RWTH Aachen University, 52056 Aachen, Germany; Institute of Pathology, RWTH Aachen University Hospital, 52074, Germany
| | - Joachim Jankowski
- Institute for Molecular Cardiovascular Research, University Hospital RWTH Aachen, Germany
| | - Christian Apel
- Department of Biohybrid & Medical Textiles (BioTex), Institut of Applied Medical Engineering, RWTH Aachen University & Hospital, Germany
| | - Rogerio B Craveiro
- Department of Orthodontics, Dental Clinic, University of Aachen, 52074 Aachen, Germany; Correspondence to: Pauwelsstr. 30, 52074 Aachen, Germany. E-mail:
| | - Michael Wolf
- Department of Orthodontics, Dental Clinic, University of Aachen, 52074 Aachen, Germany
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5
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Rizk M, Mahmoud A, Elazeem TA, Adly M. Prophylactic Sartorius Muscle Flap For Coverage of Prosthetic Vascular Grafts In the Groin: a Prospective Randomised Controlled Study. EJVES Vasc Forum 2023. [DOI: 10.1016/j.ejvsvf.2023.02.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/09/2023] Open
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6
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Rizk M, Zéboulon P, Gatinel D. Diagnosis of subclinical pressure-induced stromal keratopathy using optical coherence tomography. J Fr Ophtalmol 2023; 46:e34-e36. [PMID: 36460529 DOI: 10.1016/j.jfo.2022.06.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2022] [Revised: 06/03/2022] [Accepted: 06/11/2022] [Indexed: 11/30/2022]
Affiliation(s)
- M Rizk
- Department of Ophthalmology, Rothschild Foundation Hospital, 25, rue Manin, 75019 Paris, France.
| | - P Zéboulon
- Department of Ophthalmology, Rothschild Foundation Hospital, 25, rue Manin, 75019 Paris, France
| | - D Gatinel
- Department of Ophthalmology, Rothschild Foundation Hospital, 25, rue Manin, 75019 Paris, France
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7
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Rizk M, Youssef T, Mahmoud A, Meshref M. Risk Factors and Outcomes for Colonic Ischaemia After Abdominal Aortic Aneurism Repair: a Single Centre Experience. EJVES Vasc Forum 2023. [DOI: 10.1016/j.ejvsvf.2023.02.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/08/2023] Open
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8
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Rizk M, Mahmoud ZM, Azab MM. Spectrofluorimetric and stability-indicating thin layer chromatographic methods for determination of cabergoline, a prolactin inhibitor in pharmaceuticals. Spectrochim Acta A Mol Biomol Spectrosc 2022; 281:121639. [PMID: 35872427 DOI: 10.1016/j.saa.2022.121639] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Revised: 06/22/2022] [Accepted: 07/14/2022] [Indexed: 06/15/2023]
Abstract
Simple, Economic, and selective spectrofluorimetric and stability-indicating thin layer chromatographic (TLC) with fluorescence detection methods were developed for the determination of Cabergoline, a potent prolactin inhibitor, and long-acting dopamine receptor agonist, in bulk drug and pharmaceutical dosage forms based on its native fluorescence. Method A was based on measuring the fluorescence intensity at 338 nm after excitation at 280 nm. The measured fluorescence was directly proportional to the concentration of the drug over the range of 50.0-450.0 ng/mL with a limit of detection of 14.4 and a limit of quantification of 43.7 ng/mL. The TLC method (method B) was employed on TLC silica gel 60 F254 aluminum sheets previously exposed to concentrated (30-34 %) hydrochloric acid vapor. Ethyl acetate: n-hexane: diethylamine system with a ratio of (10: 3: 1, v/v/v) developing system was used. The retention factor (Rf) of Cabergoline was 0.58 ± 0.03. Linearity was found to be in the range of 100.0-1500.0 ng/band. The LOD and LOQ were 25.4 and 76.9 ng/band, respectively. The methods were validated successfully according to ICH guidelines.
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Affiliation(s)
- M Rizk
- Analytical Chemistry Department, Faculty of Pharmacy, Helwan University, Cairo 11795, Egypt
| | - Zainab M Mahmoud
- Analytical Chemistry Department, Faculty of Pharmacy, Helwan University, Cairo 11795, Egypt.
| | - Marwa M Azab
- Analytical Chemistry Department, Faculty of Pharmacy, Helwan University, Cairo 11795, Egypt
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Kreutz M, Kreutz C, Kanzow P, Tauböck TT, Burrer P, Noll C, Bader O, Rohland B, Wiegand A, Rizk M. Effect of Bioactive and Antimicrobial Nanoparticles on Properties and Applicability of Dental Adhesives. Nanomaterials (Basel) 2022; 12:3862. [PMID: 36364638 PMCID: PMC9694625 DOI: 10.3390/nano12213862] [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] [Figures] [Subscribe] [Scholar Register] [Received: 09/24/2022] [Revised: 10/25/2022] [Accepted: 10/28/2022] [Indexed: 06/16/2023]
Abstract
The aim of the study was to examine the applicability of bioactive and antibacterial nanoparticles to an experimental adhesive. The adhesive (60 wt% BisGMA, 15 wt% TEGDMA, 25 wt% HEMA) was mixed with combinations of 5 wt% methacryl-functionalized polyhedral oligomeric silsesquioxane (MA-POSS) and one kind of bioactive/antibacterial nanoparticles: 1 wt% core-shell silica-silver nanoparticle (SiO2@Ag), 1 wt% bioactive glass with bismuth (BAG-Bi) or 1 wt% calcium phosphate (CAP). Pure adhesive served as control. The physicochemical (degree of conversion (DC), linear shrinkage (LS), shear and complex viscosity, water sorption (WS), sol fraction (SF)), biological (antimicrobial effect) and bioactive (mineral precipitation) properties were investigated. DC and LS remained unchanged. The combination of BAG-Bi/MA-POSS resulted in a significantly increased WS and SF compared to control. In addition, the combination of CAP/MA-POSS slightly increased the shear viscosity of the adhesive. The addition of the nanoparticles did not influence the antimicrobial effects compared to the pure adhesive. Improved mineral inducing capacity could be detected in all nanoparticle combinations. The combination of bioactive and/or antibacterial nanoparticles showed improved mineral inducing capacity, but no antibacterial properties. The material properties were not or only slightly affected.
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Affiliation(s)
- Marietta Kreutz
- Department of Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, 37075 Göttingen, Germany
| | - Christian Kreutz
- Department of Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, 37075 Göttingen, Germany
| | - Philipp Kanzow
- Department of Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, 37075 Göttingen, Germany
| | - Tobias T. Tauböck
- Department of Conservative and Preventive Dentistry, Center for Dental Medicine, University of Zurich, 8032 Zurich, Switzerland
| | - Phoebe Burrer
- Department of Conservative and Preventive Dentistry, Center for Dental Medicine, University of Zurich, 8032 Zurich, Switzerland
| | - Christine Noll
- Institute of Medical Microbiology and Virology, University Medical Center Göttingen, 37075 Göttingen, Germany
| | - Oliver Bader
- Institute of Medical Microbiology and Virology, University Medical Center Göttingen, 37075 Göttingen, Germany
| | - Bianca Rohland
- Department of Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, 37075 Göttingen, Germany
| | - Annette Wiegand
- Department of Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, 37075 Göttingen, Germany
| | - Marta Rizk
- Department of Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, 37075 Göttingen, Germany
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Paiva MF, Rizk M, Pessan JP, Kreutz M, Rohland B, Biehl R, Stadler A, Stellbrink J, Wiegand A. Material properties and bioactivity of a resin infiltrant functionalized with polyhedral oligomeric silsesquioxanes. Dent Mater 2022; 38:1900-1909. [DOI: 10.1016/j.dental.2022.09.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Revised: 06/26/2022] [Accepted: 09/25/2022] [Indexed: 11/28/2022]
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Brown P, Watts V, Hanna M, Rizk M, Tucker E, Saddlemire A, Peteet B. Two Epidemics and a Pandemic: The Collision of Prescription Drug Misuse and Racism during COVID-19. J Psychoactive Drugs 2021; 53:413-421. [PMID: 34694200 DOI: 10.1080/02791072.2021.1992048] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [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: 10/20/2022]
Abstract
The present study investigated the relationship between perceived racial discrimination and prescription drug misuse (PDM) among Asian, Black, and Latinx Americans during the COVID-19 crisis. U.S. racial/ethnic minorities may have been uniquely affected by two national and one global pandemic: the opioid crisis, racism, and COVID-19. Opioid death rates increased among many groups prior to the pandemic. This country witnessed an increase in racialized acts against people of color across the spectrum in the spring and summer months of the world's COVID-19 outbreak. While studies have shown a clear link between perceived racial discrimination and substance abuse outside of the global pandemic, no identified studies have done so against the backdrop of a global health pandemic. Separate hierarchical regressions revealed a significant association between perceived racial discrimination and PDM for Black Americans, Asian Americans, and Latinx individuals. Findings build on the scant literature on PDM in diverse samples and establish a relationship between perceived racial discrimination and PDM, as previously identified for other abused substances. Future post-pandemic substance misuse interventions should consider the influence of perceived racial discrimination as they help individuals recover from the aftermath of this stressful trifecta.
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Affiliation(s)
- P Brown
- Department of Psychology, Loma Linda University, Loma Linda, California, USA
| | - V Watts
- Department of Psychology, Loma Linda University, Loma Linda, California, USA
| | - M Hanna
- Department of Psychology, Loma Linda University, Loma Linda, California, USA
| | - M Rizk
- Department of Psychology, Loma Linda University, Loma Linda, California, USA
| | - E Tucker
- Department of Psychology, Loma Linda University, Loma Linda, California, USA
| | - A Saddlemire
- Department of Psychology, Loma Linda University, Loma Linda, California, USA
| | - B Peteet
- Department of Psychology, Loma Linda University, Loma Linda, California, USA
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Rizk M, Toubar S, Ramzy E, Helmy M. Sensitive and validated TLC densitometry method coupled with fluorescence detection for quantitative determination of the newly co-formulated drugs, celecoxib and amlodipine besylate in tablet dosage form. ACTA CHROMATOGR 2021. [DOI: 10.1556/1326.2021.00890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Abstract
New, sensitive, rapid, cost-effective, and validated stability-indicating thin layer chromatographic (TLC) method coupled with fluorescence (FL) detection was developed for the quantitative analysis of celecoxib (CEL) and amlodipine besylate (AMLO) in their laboratory prepared binary mixture using the non-fluorescent TLC silica gel 60 plates. Ethyl acetate: diethylamine: 1-propanol (9:1:0.2, V/V) was used as a developing system. The retention factor (Rf) for each drug was 0.80 ± 0.03 and 0.44 ± 0.01 for CEL and AMLO, respectively. The plates were excited at 264 nm for the simultaneous FL measurement of CEL and AMLO, the calibration curves were linear over a concentration ranges of 30.0–300.0 ng/band and 15.0–150.0 ng/band with mean percentage recoveries of 99.80 ± 0.85 and 99.80 ± 0.77 For CEL and AMLO, respectively. The developed method was applied for the stability studies of the cited drugs in their laboratory prepared binary mixture and the forced degradation products were determined when present in presence of the pure drugs so the method can be considered as a stability-indicating one and it was validated as per ICH guidelines and proved to be accurate and precise.
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Affiliation(s)
- M. Rizk
- Analytical Chemistry Department, Faculty of Pharmacy, Helwan University, EinHelwan, 11795, Cairo, Egypt
| | - S. Toubar
- Analytical Chemistry Department, Faculty of Pharmacy, Helwan University, EinHelwan, 11795, Cairo, Egypt
| | - E. Ramzy
- Analytical Chemistry Department, Faculty of Pharmacy, Helwan University, EinHelwan, 11795, Cairo, Egypt
| | - Marwa Helmy
- Analytical Chemistry Department, Faculty of Pharmacy, Helwan University, EinHelwan, 11795, Cairo, Egypt
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Rivas-Mundiña B, Vargas-Osorio Z, Yáñez-Vilar S, Rizk M, Piñeiro Y, Pérez-Sayáns M, Rivas J. Hybrid mesoporous nanostructured scaffolds as dielectric biosimilar restorative materials. Biomed Mater Eng 2021; 32:243-255. [PMID: 33780354 DOI: 10.3233/bme-201118] [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] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND The intricate structure of natural materials is in correspondence with its highly complex functional behaviour. The health of teeth depends, in a complex way, on a heterogeneous arrangement of soft and hard porous tissues that allow for an adequate flow of minerals and oxygen to provide continuous restoration. Although restorative materials, used in clinics, have been evolving from the silver amalgams to actual inorganic fillers, their structural and textural properties are scarcely biomimetic, hindering the functional recovery of the tissue. OBJECTIVE The objective of this work is to compare and test the hybrid mesoporous silica-based scaffolds as candidates for dentine restoration applications. METHODS In this work, we present the development and the physical properties study of biocompatible hybrid mesoporous nanostructured scaffolds with a chemically versatile surface and biosimilar architecture. We test their textural (BET) and dielectric permittivity (ac impedance) properties. RESULTS These materials, with textural and dielectric properties similar to dentine and large availability for the payload of therapeutic agents, are promising candidates as functional restorative materials, suitable for impedance characterization techniques in dental studies. CONCLUSIONS Structural, textural, morphological characterization and electrical properties of hybrid mesoporous show a large degree of similarity to natural dentin samples.
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Affiliation(s)
- Berta Rivas-Mundiña
- Surgical and Medical-Surgical Specialities Department, Universidade de Santiago de Compostela, Spain
| | - Zulema Vargas-Osorio
- Department of Applied Physics, Nanotechnology and Magnetism Laboratory (NANOMAG), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
| | - Susana Yáñez-Vilar
- Department of Applied Physics, Nanotechnology and Magnetism Laboratory (NANOMAG), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
| | - Marta Rizk
- Department for Preventive Dentistry, Periodontology and Cardiology, University Medical Center Göttingen, Göttingen, Germany
| | - Yolanda Piñeiro
- Department of Applied Physics, Nanotechnology and Magnetism Laboratory (NANOMAG), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
| | - Mario Pérez-Sayáns
- Surgical and Medical-Surgical Specialities Department, Universidade de Santiago de Compostela, Spain.,Instituto de Investigación de Santiago de Compostela (IDIS), Santiago de Compostela, Spain
| | - José Rivas
- Department of Applied Physics, Nanotechnology and Magnetism Laboratory (NANOMAG), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
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Abstract
MicroRNAs (miRNAs) are a form of single-stranded RNA molecules with a length that varies between 18 and 23 nucleotides and which are synthesized in the nucleus but function in the cytoplasm. miRNAs function endogenously and bind to complementary sequences in either the coding regions or the 3' untranslated regions (UTRs) of target messenger RNAs (mRNAs). This indicates that miRNAs operate in a post-transcriptional manner. miRNAs play essential roles in various biological events, and have thus been found extracellularly in different body fluids such as saliva, urine and plasma. miRNAs are distinguished in the gut mainly by examining content from intestines and feces. The gastrointestinal tract is infested with a variety of microorganisms that are initially inherited from the mother; however, those microorganisms develop as a result of changes in dietary intakes and environmental factors. The gut microbiota are therefore shaped differently in different individuals due to several contributing factors such as genetics, diet and state of disease, and have a great impact on the host during phases of disease and homeostasis.
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Affiliation(s)
- M Rizk
- Medical Genetics and Genomics Program, School of Medicine, Dentistry, and Nursing, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, Scotland, UK
| | - S Tüzmen
- Faculty of Dentistry, Eastern Mediterranean University (EMU), Famagusta, North Cyprus.
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Hetland ML, Haavardsholm EA, Rudin A, Nordström D, Nurmohamed M, Gudbjornsson B, Lampa J, Hørslev-Petersen K, Uhlig T, Gröndal G, Ǿstergaard M, Heiberg M, Twisk J, Krabbe S, Lend K, Olsen I, Lindqvist J, Ekwall AKH, Grøn KL, Kapetanovic MC, Faustini F, Tuompo R, Lorenzen T, Cagnotto G, Baecklund E, Hendricks O, Vedder D, Sokka-Isler T, Husmark T, Ljosa MKA, Brodin E, Ellingsen T, Soderbergh A, Rizk M, Reckner Å, Larsson P, Uhrenholt L, Just SA, Stevens D, Laurberg TB, Bakland G, Van Vollenhoven R. OP0018 A MULTICENTER RANDOMIZED STUDY IN EARLY RHEUMATOID ARTHRITIS TO COMPARE ACTIVE CONVENTIONAL THERAPY VERSUS THREE BIOLOGICAL TREATMENTS: 24 WEEK EFFICACY RESULTS OF THE NORD-STAR TRIAL. Ann Rheum Dis 2020. [DOI: 10.1136/annrheumdis-2020-eular.689] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Background:The optimal first-line treatment of patients (pts) with early rheumatoid arthritis (RA) is yet to be established.Objectives:The primary aim was to assess and compare the proportion of pts who achieved remission with active conventional therapy (ACT) and with three different biologic therapies after 24 wks. Secondary aims were to assess and compare other efficacy measures.Methods:The investigator-initiated NORD-STAR trial (NCT01491815) was conducted in the Nordic countries and Netherlands. In this multicenter, randomized, open-label, blinded-assessor study pts with treatment-naïve, early RA with DAS28>3.2, and positive RF or ACPA, or CRP >10mg/L were randomized 1:1:1:1. Methotrexate (25 mg/week after one month) was combined with: 1) (ACT): oral prednisolone (tapered quickly);or: sulphasalazine, hydroxychloroquine and mandatory intra-articular (IA) glucocorticoid (GC) injections in swollen joints <wk 20; 2) certolizumab 200 mg EOW SC (CZP); 3) abatacept 125 mg/wk SC (ABA); tocilizumab 162 mg/wk SC (TCZ). IA GC was allowed in all arms <wk 20. Primary outcome was clinical disease activity index remission (CDAI≤2.8) at wk 24. Secondary outcomes included CDAI remission over time and other remission criteria. Dichotomous outcomes were analyzed by adjusted logistic regression with non-responder imputation (NRI). Non-inferiority analyses had a pre-specified margin of 15%.Results:812 pts were randomized. Age was 54.3±14.7 yrs (mean±SD), 31.2% were male, DAS28 5.0±1.1, 74.9% were RF and 81.9% ACPA positive. Fig 1 shows the adjusted CDAI remission rates over time with 95% CI. Table shows crude remission and response rates and absolute differences in adjusted remission and response rates (superiority analysis). Differences in remission and response rates with CZP and TCZ, but not with ABA, remained within the pre-defined non-inferiority margin versus ACT, Fig 2.Figure 1.CDAI remission over time (adj. estimates with 95% CI)Figure 2.Non-inferiority analysis of protocol population. Estimated differences in CDAI remission rates between Arm 1 (active conventional therapy) and Arms 2, 3, and 4 (biologic arms) as reference with 95% confidence intervals, adjusted for gender, ACPA status, country, age, body-mass index and baseline DAS28-CRP. ABA, abatacept; CZP, certolizumab-pegol; MTX, methotrexate; TCZ, tocilizumab.Conclusion:High remission rates were found across all four treatment arms at 24 wks. Higher CDAI remission rate was observed for ABA versus ACT (+9%) and for CZP (+4%), but not for TCZ (-1%). With the predefined 15% margin, ACT was non-inferior to CZP and TCZ, but not to ABA. This underscores the efficacy of active conventional therapy based on MTX combined with glucocorticoids and may guide future treatment strategies for early RA.Table.Primary and key secondary outcomes at 24 weeks (ITT)Active conventional therapy (ACT)Certolizumab+MTXAbatacept+MTXTocilizumab+MTXNo of pts (ITT)200203204188§Crude remission and response ratesCDAI remission42.0%47.8%52.5%41.0%ACR/EULAR Boolean remission34.0%38.4%37.3%31.4%DAS28 remission63.5%68.5%69.6%63.3%SDAI remission41.5%49.8%51.5%42.6%EULAR good response71.5%76.9%79.9%71.3%Difference (95% CI) in rates with Arm 1 as reference (adjusted)CDAI remissionRef4% (-5 to 13%)9% (0.1 to 19%)-1% (-10 to 9%)ACR/EULAR Boolean remissionRef4% (-6 to 13%)5% (-5 to 14%)-4% (-13 to 6%)DAS28 remissionRef3% (-6 to 11%)5% (-4 to 13%)-1% (-10 to 8%)SDAI remissionRef6% (-3 to 18%)9% (-0.3 to 18%)1% (-8 to 11%)EULAR good responseRef4% (-4 to 14%)8% (-2 to 18%)0.4% (-10 to 11%)§17 patients allocated to Tocilizumab did not receive it due to its unavailability and were excluded from ITT.Acknowledgments:Manufacturers provided CZP and ABA.Disclosure of Interests:Merete L. Hetland Grant/research support from: BMS, MSD, AbbVie, Roche, Novartis, Biogen and Pfizer, Consultant of: Eli Lilly, Speakers bureau: Orion Pharma, Biogen, Pfizer, CellTrion, Merck and Samsung Bioepis, Espen A Haavardsholm Grant/research support from: AbbVie, UCB Pharma, Pfizer Inc, MSD Norway, Roche Norway, Consultant of: Pfizer, AbbVie, Janssen-Cilag, Gilead, UCB Pharma, Celgene, Lilly, Paid instructor for: UCB Pharma, Speakers bureau: Pfizer, AbbVie, UCB Pharma, Celgene, Lilly, Roche, MSD, Anna Rudin Consultant of: Astra/Zeneca, Dan Nordström Consultant of: Abbvie, Celgene, Lilly, Novartis, Pfizer, Roche and UCB., Speakers bureau: Abbvie, Celgene, Lilly, Novartis, Pfizer, Roche and UCB., Michael Nurmohamed Grant/research support from: Not related to this research, Consultant of: Not related to this research, Speakers bureau: Not related to this research, Björn Gudbjornsson Speakers bureau: Novartis and Amgen, Jon Lampa Speakers bureau: Pfizer, Janssen, Novartis, Kim Hørslev-Petersen: None declared, Till Uhlig Consultant of: Lilly, Pfizer, Speakers bureau: Grünenthal, Novartis, Gerdur Gröndal: None declared, Mikkel Ǿstergaard Grant/research support from: AbbVie, Bristol-Myers Squibb, Celgene, Merck, and Novartis, Consultant of: AbbVie, Bristol-Myers Squibb, Boehringer Ingelheim, Celgene, Eli Lilly, Hospira, Janssen, Merck, Novartis, Novo Nordisk, Orion, Pfizer, Regeneron, Roche, Sandoz, Sanofi, and UCB, Speakers bureau: AbbVie, Bristol-Myers Squibb, Boehringer Ingelheim, Celgene, Eli Lilly, Hospira, Janssen, Merck, Novartis, Novo Nordisk, Orion, Pfizer, Regeneron, Roche, Sandoz, Sanofi, and UCB, Marte Heiberg: None declared, Jos Twisk: None declared, Simon Krabbe: None declared, Kristina Lend: None declared, Inge Olsen: None declared, Joakim Lindqvist: None declared, Anna-Karin H Ekwall Consultant of: AbbVie, Pfizer, Kathrine L. Grøn Grant/research support from: BMS, Meliha C Kapetanovic: None declared, Francesca Faustini: None declared, Riitta Tuompo: None declared, Tove Lorenzen: None declared, Giovanni Cagnotto: None declared, Eva Baecklund: None declared, Oliver Hendricks Grant/research support from: Pfizer, MSD, Daisy Vedder: None declared, Tuulikki Sokka-Isler: None declared, Tomas Husmark: None declared, Maud-Kristine A Ljosa: None declared, Eli Brodin: None declared, Torkell Ellingsen: None declared, Annika Soderbergh: None declared, Milad Rizk Speakers bureau: AbbVie, Åsa Reckner: None declared, Per Larsson: None declared, Line Uhrenholt Speakers bureau: Abbvie, Eli Lilly and Novartis (not related to the submitted work), Søren Andreas Just: None declared, David Stevens: None declared, Trine Bay Laurberg Consultant of: UCB Pharma (Advisory Board), Gunnstein Bakland Consultant of: Novartis, UCB, Ronald van Vollenhoven Grant/research support from: BMS, GSK, Lilly, UCB, Pfizer, Roche, Consultant of: AbbVie, AstraZeneca, Biogen, Biotest, Celgene, Gilead, Janssen, Pfizer, Servier, UCB, Speakers bureau: AbbVie, Pfizer, UCB
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Rizk M, Mouillot T, Thiefin G, Bronowicki JP, Richou C, Doffoel M, Hebert J, Shivappa N, Boutron-Ruault MC, Hillon P, Cottet V. Potentiel inflammatoire de l’alimentation et risque de carcinome hépatocellulaire chez des patients atteints de cirrhose. NUTR CLIN METAB 2020. [DOI: 10.1016/j.nupar.2020.02.190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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17
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Gohar S, Montaser B, Elabd N, Elhamoly M, Saleh A, Salem E, Abo-Zeid G, Rizk M. Relation between Interleukin -4 (590C/T) gene polymorphism and hepatocellular carcinoma risk in HBV and HCV patients. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz422.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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18
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Soares Dos Santos DM, Braga AS, Rizk M, Wiegand A, Magalhães AC. Comparison between micro-computed tomography and transverse microradiography of sound dentine treated with fluorides and demineralized by microcosm biofilm. Eur J Oral Sci 2019; 127:508-514. [PMID: 31584713 DOI: 10.1111/eos.12656] [Citation(s) in RCA: 2] [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] [Indexed: 11/26/2022]
Abstract
The study aimed to apply micro-computed tomography (micro-CT) and transverse microradiography (TMR) to measure dentine demineralization and to test the preventive effect of titanium tetrafluoride (TiF4 ) under microcosm biofilm. Sound dentine specimens from bovine root were treated for 6 h with: (i) 4.0% titanium tetrafluoride (TiF4 ) varnish [pH 1.0, 2.45% fluoride (F-); (ii) 5.42% sodium fluoride (NaF) varnish (pH 5.0, 2.45% F); (iii) 2% chlorhexidine (CHX) gel (pH 7.0); (iv) placebo varnish (pH 5.0); or (v) no agent (untreated). Dentine specimens were then exposed to human saliva mixed with McBain saliva for 8 h. Thereafter, McBain saliva containing 0.2% sucrose was applied daily, for 5 d, onto dentine specimens to stimulate formation of microcosm biofilm. Although a high correlation was found between the results of both methods regarding integrated mineral loss, the results of the methods did not show good agreement in Bland-Altman plots, with significant biases in calculations of lesion depth. Fluoride varnishes were able to reduce dentine demineralization (P < 0.05), while CHX failed to do so. Fluorides are still the best option to reduce dentine demineralization. Micro-CT may be used to measure dentine mineral loss, but not the lesion depth, for which TMR is superior.
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Affiliation(s)
| | - Aline S Braga
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil
| | - Marta Rizk
- Department of Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Göttingen, Germany
| | - Annette Wiegand
- Department of Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Göttingen, Germany
| | - Ana C Magalhães
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil
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Abstract
Onpattro, also commonly known as patisiran, is a small interfering RNA (siRNA) molecule packaged within a lipid nanoparticle and is transported into the cell to target transthyretin gene (TTR) messenger mRNA (mRNA) by attaching to its complementary sequence. The target mRNA is degraded and both mutant and wild-type amyloid transthyretin (ATTR) protein production becomes suppressed. This drug was developed by Alnylam Pharmaceuticals to treat a rare disease called hereditary ATTR (hATTR) amyloidosis. This disease develops as a result of the deposition of toxic aggregates of misfolded TTR protein, and is progressive causing the affected individual to be bed bound and to eventually die if left untreated. However, variable expressivity and incomplete penetrance cause carriers of TTR gene variants to be asymptomatic for a prolonged time. The heterogeneity of symptoms makes correct diagnosis of the disease difficult, therefore management of symptoms and proper treatment are delayed as a result. However, certain TTR variants are found in endemic or cluster regions, which facilitates their detection. In this review paper, different aspects of the drug are discussed in detail, including its preclinical and clinical studies, as well as its pharmacokinetic properties along with drug interactions leading to its approval by the U.S. Food and Drug Administration (FDA) and the European Medicines Agency (EMA).
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Affiliation(s)
- M Rizk
- Medical Genetics and Genomics Program, School of Medicine, Dentistry, and Nursing, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, Scotland; Molecular Biology and Genetics Program, Department of Biological Sciences, Faculty of Arts and Sciences, Eastern Mediterranean University (EMU), Famagusta, North Cyprus, Turkey
| | - S Tüzmen
- Molecular Biology and Genetics Program, Department of Biological Sciences, Faculty of Arts and Sciences, Eastern Mediterranean University (EMU), Famagusta, North Cyprus, Turkey.
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Abstract
The study aimed to compare the repair bond strength of aged composite and amalgam repaired with resin composite after various mechanical and adhesive surface treatments. Specimens were aged by thermal cycling (10,000 cycles, 5-55°C) and randomly subjected to one of three surface treatments: diamond bur abrasion, aluminum oxide air abrasion, or silica coating. Conventional bonding or a universal adhesive with incorporated silane was applied afterward (each n = 16) and resin composite was attached. In the control groups (each n = 16), resin composite was attached using one of the above adhesives without prior mechanical surface conditioning. After further thermal cycling, the shear bond strength (SBS) and failure modes were assessed. Statistical analyses were performed using ANOVA, Weibull statistics, two sample t-tests, and Chi2-test (P < 0.05). The SBS of the repaired amalgam was significantly lower than that of the composite and mechanical pretreatment significantly increased SBS. The universal adhesive significantly improved the SBS of the repaired amalgam compared to the conventional bonding agent and mechanical pretreatment increased the number of cohesive/mixed failures. Amalgam restorations may be repaired using resin composites, but the resulting SBS is lower than that obtained with composite.
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Affiliation(s)
- Philipp Kanzow
- Department of Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen
| | - Steffi Baxter
- Department of Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen
| | - Marta Rizk
- Department of Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen
| | - Torsten Wassmann
- Department of Prosthodontics, University Medical Center Göttingen
| | - Annette Wiegand
- Department of Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen
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21
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Rizk M, Darwish N, Yousef H, Abd EL Rahim E, El Saied I. Production of free-gluten bread from some cereal crops. Al-Azhar Journal of Agricultural Research 2019; 44:100-106. [DOI: 10.21608/ajar.2019.59661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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Tallá Ferrer C, Vilariño-Feltrer G, Rizk M, Sydow HG, Vallés-Lluch A. Nanocomposites based on poly(glycerol sebacate) with silica nanoparticles with potential application in dental tissue engineering. INT J POLYM MATER PO 2019. [DOI: 10.1080/00914037.2019.1616197] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- C. Tallá Ferrer
- Centre for Biomaterials and Tissue Engineering, Universitat Politècnica de València, Valencia, Spain
| | - G. Vilariño-Feltrer
- Centre for Biomaterials and Tissue Engineering, Universitat Politècnica de València, Valencia, Spain
| | - M. Rizk
- Department for Preventive Dentistry, Parodontology and Cariology, University Medical Center, Göttingen, Germany
| | - H. G. Sydow
- Institute of Anatomy and Embryology, University Medical Center, Göttingen, Germany
| | - A. Vallés-Lluch
- Centre for Biomaterials and Tissue Engineering, Universitat Politècnica de València, Valencia, Spain
- Biomaterials and Nanomedicine (CIBER-BBN), Biomedical Research Networking Centre in Bioengineering, Valencia, Spain
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Rödig T, Krämer J, Müller C, Wiegand A, Haupt F, Rizk M. Incidence of microcracks after preparation of straight and curved root canals with three different NiTi instrumentation techniques assessed by micro-CT. AUST ENDOD J 2019; 45:394-399. [PMID: 30907062 DOI: 10.1111/aej.12339] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/02/2019] [Indexed: 01/31/2023]
Abstract
This study evaluated the effect of three different NiTi instrumentation techniques on the incidence of microcracks after the preparation of straight and curved root canals using micro-CT. Roots from mandibular premolars and maxillary molars (n = 66) with the same mean canal curvatures were assigned to three groups of straight and three groups of curved roots (n = 11). After preoperative micro-CT scans, root canals were prepared with Reciproc, OneShape and ProTaper Next to size 25. Specimens were scanned again, and pre- and post-operative cross-sectional images (n = 75 263) were screened to identify the presence of dentinal microcracks. Overall, microcracks were detected in 2.97% (n = 2236) of the cross-sectional images. No new dentinal microcracks were observed after root canal instrumentation of straight and curved canals with the tested NiTi systems. Instrumentation with Reciproc, OneShape and ProTaper Next did not induce the formation of dentinal microcracks irrespective of canal curvature.
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Affiliation(s)
- Tina Rödig
- Department for Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Göttingen, Germany
| | - Juliane Krämer
- Department for Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Göttingen, Germany
| | - Christine Müller
- Department for Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Göttingen, Germany
| | - Annette Wiegand
- Department for Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Göttingen, Germany
| | - Franziska Haupt
- Department for Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Göttingen, Germany
| | - Marta Rizk
- Department for Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Göttingen, Germany
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Rödig T, Koberg C, Baxter S, Konietschke F, Wiegand A, Rizk M. Micro-CT evaluation of sonically and ultrasonically activated irrigation on the removal of hard-tissue debris from isthmus-containing mesial root canal systems of mandibular molars. Int Endod J 2019; 52:1173-1181. [PMID: 30773661 DOI: 10.1111/iej.13100] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [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: 10/01/2018] [Accepted: 02/13/2019] [Indexed: 01/23/2023]
Abstract
AIM To evaluate the efficacy of sonically and ultrasonically activated irrigation on removal of accumulated hard-tissue debris (AHTD) in mesial root canal systems of mandibular molars using micro-computed tomographic (micro-CT) analysis. METHODOLOGY Forty mesial roots of mandibular molars with two independent canals joined apically by an isthmus (Vertucci type II) were selected. The root canals were instrumented using Reciproc R25 instruments, and specimens were scanned at a resolution of 10.5 μm. Subsequently, n = 10 roots were assigned to each of the four final irrigation groups such that the group means and variances were almost identical: sonically activated irrigation with EndoActivator (EA) or EDDY (ED), ultrasonically activated irrigation (UAI) and manual irrigation without activation (MI). The final irrigation procedures were performed using a total of 5 mL 1% NaOCl and 5 mL 15% EDTA per canal over 5 min with activation time of 4 × 20 s. Reconstructed data sets were coregistered, and the mean percentage reduction of AHTD after final irrigation was compared statistically between groups using analysis of variance at a significance level set at 5%. RESULTS A significant reduction of AHTD was achieved after final irrigation in all groups (P < 0.05), ranging from 44.1% to 66.8%. The vol% of debris after irrigation was 3.7 ± 1.9% for EA, 3.3 ± 2.3% for ED, 2.1 ± 1.6% for UAI and 4.4 ± 2.3% for MI, with no significant difference between groups (P > 0.05). CONCLUSIONS None of the final irrigation protocols completely removed AHTD from mesial root canal systems in extracted human mandibular molars. Sonically and ultrasonically activated irrigation performed no better compared to manual irrigation.
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Affiliation(s)
- T Rödig
- Department for Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Göttingen, Germany
| | - C Koberg
- Department for Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Göttingen, Germany
| | - S Baxter
- Department for Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Göttingen, Germany
| | - F Konietschke
- Institute of Biometry and Clinical Epidemiology, Charité - University Medical Center Berlin, Berlin, Germany
| | - A Wiegand
- Department for Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Göttingen, Germany
| | - M Rizk
- Department for Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Göttingen, Germany
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Rizk M, Abd El-Twab F, Abo Doma A, Amar M, Magdy M. F-AFLP GENOME SCAN AMONG FOURTEEN GENOTYPES OF SUNFLOWER (Helianthus annuus L.). Arab Universities Journal of Agricultural Sciences 2019; 26:2489-2501. [DOI: 10.21608/ajs.2018.35615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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Mouillot T, Rizk M, Pais de Barros JP, Guilloteau A, Busson A, Minello A, Latournerie M, Brindisi MC, Petit JM, Hillon P, Cottet V. Composition en acides gras de la membrane érythrocytaire et risque de carcinome hépatocellulaire chez des personnes atteintes de cirrhose. NUTR CLIN METAB 2018. [DOI: 10.1016/j.nupar.2018.09.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Rizk M, Guilloteau A, Mouillot T, Busson A, Thiefin G, Bronowicki JP, Di Martino V, Doffoel M, Diab Assaf M, Hillon P, Cottet V. Facteurs nutritionnels et risque de carcinome hépatocellulaire chez des personnes atteintes de cirrhose. NUTR CLIN METAB 2018. [DOI: 10.1016/j.nupar.2018.09.120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Haupt F, Seidel M, Rizk M, Sydow HG, Wiegand A, Rödig T. Diameter and Taper Variability of Single-file Instrumentation Systems and Their Corresponding Gutta-percha Cones. J Endod 2018; 44:1436-1441. [PMID: 30078573 DOI: 10.1016/j.joen.2018.06.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [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: 02/28/2018] [Revised: 06/05/2018] [Accepted: 06/07/2018] [Indexed: 10/28/2022]
Abstract
INTRODUCTION Manufacturers offer single-file instrumentation systems with matching gutta-percha (GP) cones to simplify root canal preparation and obturation. The purpose of this study was to determine whether file diameters and tapers match with corresponding cone diameters and tapers (precision) as well as industry standards (accuracy). METHODS Twenty files and corresponding GP cones from each size of F360 (#25, #35, #45, #55 with .04 taper) and Reciproc (#25, #40, #50 with variable tapers) instruments were examined by using optical microscopy (×32) to determine their diameter and taper. Precision was evaluated by using one-way analysis of variance (α = 0.05) with Scheffé post hoc tests and t tests with Bonferroni correction. Accuracy was calculated by subtracting the nominal values from the measured values of all files and GP cones, and mean diameter and taper differences were compared by using one-way analysis of variance (α = 0.05) and Scheffé post hoc test for pairwise comparison. RESULTS For F360, the majority of file and cone diameters were within the tolerance levels, but most of the file diameters were significantly larger than GP cone diameters (P < .05), but the majority of all measured values were within the tolerance levels. For Reciproc, file and cone diameters at D1 and D3 mostly approached the nominal values. At the coronal end, file diameters #25 and #50 were significantly smaller than cone diameters (P < .05). For both instrumentation systems, almost all file and cone tapers matched with the preset tolerance ranges. For Reciproc, significant differences between file and GP cone demonstrated either smaller cone or smaller file diameters and tapers, depending on the size. Most of the measured values were within the acceptable range, but diameters at the coronal end exhibited the highest percent difference from the nominal values. CONCLUSIONS Despite the call for standardization, variability in diameter and taper dimensions between single-file instrumentation systems and their corresponding GP cones can be expected.
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Affiliation(s)
- Franziska Haupt
- Department for Preventive Dentistry, Periodontology and Cariology, University Medical Center, Göttingen, Germany.
| | - Miriam Seidel
- Department for Preventive Dentistry, Periodontology and Cariology, University Medical Center, Göttingen, Germany
| | - Marta Rizk
- Department for Preventive Dentistry, Periodontology and Cariology, University Medical Center, Göttingen, Germany
| | - Hans-Georg Sydow
- Institute of Anatomy and Embryology, University Medical Center, Göttingen, Germany
| | - Annette Wiegand
- Department for Preventive Dentistry, Periodontology and Cariology, University Medical Center, Göttingen, Germany
| | - Tina Rödig
- Department for Preventive Dentistry, Periodontology and Cariology, University Medical Center, Göttingen, Germany
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Rödig T, Wagner J, Wiegand A, Rizk M. Efficacy of the ProTaper retreatment system in removing Thermafil, GuttaCore or vertically compacted gutta-percha from curved root canals assessed by micro-CT. Int Endod J 2018; 51:808-815. [PMID: 29363142 DOI: 10.1111/iej.12893] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [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: 10/23/2017] [Accepted: 01/18/2018] [Indexed: 11/28/2022]
Abstract
AIM To evaluate ex vivo the efficacy of ProTaper Universal Retreatment files (Dentsply Sirona, Ballaigues, Switzerland) in removing Thermafil, GuttaCore (both Dentsply Sirona) or vertically compacted gutta-percha from curved root canals using micro-CT. METHODOLOGY Sixty curved molar roots with the same mean canal curvatures and radii in two directions were prepared using ProFile instruments (Dentsply Sirona) to size 30 with .04 taper and obturated with either Thermafil, GuttaCore or vertically compacted gutta-percha and AH Plus (n = 20). Specimens were retreated using the ProTaper Universal Retreatment files D1, D2 and D3 to working length, and root canal preparation was completed with ProTaper Next (Dentsply Sirona) to size ×4. Percentages of residual filling material and dentine removal were assessed using micro-CT imaging. Working time and procedural errors were recorded. Statistical analysis was performed using Kruskal-Wallis and Wilcoxon tests. RESULTS No significant differences between carrier-based and warm vertical compaction regarding residual filling material (14.2-19.3%) and dentine removal (2.7-3.2 mm3 ) were detected (P > 0.05). Time to reach working length was significantly faster for canals filled with GuttaCore than that observed for Thermafil and warm vertical compaction (P < 0.05). Five lateral perforations with the D3 file occurred during retreatment, one in the Thermafil and four in the vertical compaction group. CONCLUSIONS Remaining filling material and dentine removal were similar for all canal filling techniques. Regaining working length was significantly faster for GuttaCore compared with Thermafil and vertically compacted gutta-percha. Procedural errors occurred during retreatment of severely curved root canals with the ProTaper Universal Retreatment files in 5 of 60 canals (8%).
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Affiliation(s)
- T Rödig
- Department for Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Göttingen, Germany
| | - J Wagner
- Department for Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Göttingen, Germany
| | - A Wiegand
- Department for Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Göttingen, Germany
| | - M Rizk
- Department for Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, Göttingen, Germany
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Monaghan M, Rizk M, Pilon S, Iyengar A, Shorr R, Tay J, Maze D, Bredeson C, Hutton B, Allan DS. Network geometry of evidence from randomised controlled trials addressing donor selection and source of haematopoietic progenitor cells used in allogeneic transplantation: a systematic scoping review. Transfus Med 2018; 28:371-379. [PMID: 29380924 DOI: 10.1111/tme.12509] [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] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Revised: 11/01/2017] [Accepted: 01/03/2018] [Indexed: 11/28/2022]
Abstract
BACKGROUND AND METHODS A scoping review of randomised controlled trials (RCTs) addressing source of cells and choice of donor for allogeneic haematopoietic cell transplantation (HCT) was performed to create a network of best evidence that allows us to identify new potential indirect comparisons for the strategic development of future studies that connect to the existing evidence network. RESULTS A total of 19 eligible RCTs (2589 total patients) were identified. Nine studies (1566 patients) compared clinical outcomes following the use of peripheral blood progenitor cells (PBPCs) with bone marrow (BM) from matched related donors (eight studies) or matched unrelated donors (one study). The remaining studies compared BM or PBPCs with various methods of BM stimulation or manipulation (six studies), compared different methods of surface molecule-based selection and/or depletion of grafts (two studies) or compared the optimal number of units for paediatric cord blood transplantation (two studies). No published RCTs compared different types of donors. The geometry of the evidence network was analysed to identify opportunities for potential novel indirect comparisons and to identify opportunities to expand the network. Few indirect comparisons are currently feasible due to small sample size and heterogeneity in patient diagnoses and demographics between treatment nodes in the network. CONCLUSION More RCTs that enrol greater numbers of similar patients are needed to leverage the current evidence network concerning donor choice and source of cells used in allogeneic HCT.
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Affiliation(s)
- M Monaghan
- Blood and Marrow Transplantation Program, Department of Medicine (Hematology), University of Ottawa, Ottawa, ON, Canada
| | - M Rizk
- Blood and Marrow Transplantation Program, Department of Medicine (Hematology), University of Ottawa, Ottawa, ON, Canada
| | - S Pilon
- Blood and Marrow Transplantation Program, Department of Medicine (Hematology), University of Ottawa, Ottawa, ON, Canada
| | - A Iyengar
- Blood and Marrow Transplantation Program, Department of Medicine (Hematology), University of Ottawa, Ottawa, ON, Canada
| | - R Shorr
- Information Services, The Ottawa Hospital, Ottawa, ON, Canada
| | - J Tay
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, ON, Canada.,Department of Medicine, University of Calgary, Canada
| | - D Maze
- Blood and Marrow Transplantation Program, Department of Medicine (Hematology), University of Ottawa, Ottawa, ON, Canada.,Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, ON, Canada
| | - C Bredeson
- Blood and Marrow Transplantation Program, Department of Medicine (Hematology), University of Ottawa, Ottawa, ON, Canada.,Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, ON, Canada
| | - B Hutton
- Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, ON, Canada
| | - D S Allan
- Blood and Marrow Transplantation Program, Department of Medicine (Hematology), University of Ottawa, Ottawa, ON, Canada.,Clinical Epidemiology Program, Ottawa Hospital Research Institute, Ottawa, ON, Canada
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Peterson J, Rizk M, Hoch M, Wiegand A. Bonding performance of self-adhesive flowable composites to enamel, dentin and a nano-hybrid composite. Odontology 2017; 106:171-180. [PMID: 29243187 DOI: 10.1007/s10266-017-0324-3] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [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: 02/06/2017] [Accepted: 09/06/2017] [Indexed: 11/29/2022]
Abstract
This study aimed to analyze bond strengths of self-adhesive flowable composites on enamel, dentin and nano-hybrid composite. Enamel, dentin and nano-hybrid composite (Venus Diamond, Heraeus Kulzer, Germany) specimens were prepared. Three self-adhesive composites (Constic, DMG, Germany; Fusio Liquid Dentin, Pentron Clinical, USA; Vertise Flow, Kerr Dental, Italy) or a conventional flowable composite (Venus Diamond Flow, Heraeus Kulzer, Germany, etch&rinse technique) were applied to enamel and dentin. Nano-hybrid composite specimens were initially aged by thermal cycling (5000 cycles, 5-55 °C). Surfaces were left untreated or pretreated by mechanical roughening, Al2O3 air abrasion or silica coating/silanization. In half of the composite specimens, an adhesive (Optibond FL, Kerr Dental, Italy) was used prior to the application of the flowable composites. Following thermal cycling (5000 cycles, 5-55 °C) of all specimens, shear bond strengths (SBS) and failure modes were analyzed (each subgroup n = 16). Statistical analysis was performed by ANOVAs/Bonferroni post hoc tests, Weibull statistics and χ 2-tests (p < 0.05). SBS (MPa) of the self-adhesive composites on enamel and dentin were significantly lower (enamel: < 5, dentin: < 3) than those of the conventional flowable composite (enamel: 13.0 ± 5.1, dentin: 11.2 ± 6.3), and merely adhesive failures could be observed. On the nano-hybrid composite, SBS were significantly related to the pretreatment. Adhesive application improved SBS of the conventional, but not of the self-adhesive composites. The self-adhesive composite groups showed less cohesive failures than the reference group; the occurence of cohesive failures increased after surface pretreatment. Bonding of self-adhesive flowable composites to enamel and dentin is lower than bonding to a nano-hybrid composite.
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Affiliation(s)
- Jana Peterson
- Department of Preventive Dentistry, Periodontology and Cariology, University of Goettingen, Robert-Koch-Str. 40, 37075, Göttingen, Germany.
| | - Marta Rizk
- Department of Preventive Dentistry, Periodontology and Cariology, University of Goettingen, Robert-Koch-Str. 40, 37075, Göttingen, Germany
| | - Monika Hoch
- Department of Preventive Dentistry, Periodontology and Cariology, University of Goettingen, Robert-Koch-Str. 40, 37075, Göttingen, Germany
| | - Annette Wiegand
- Department of Preventive Dentistry, Periodontology and Cariology, University of Goettingen, Robert-Koch-Str. 40, 37075, Göttingen, Germany
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Rödig T, Müller C, Hoch M, Haupt F, Schulz X, Wiegand A, Rizk M. Moisture content of root canal dentine affects detection of microcracks using micro-computed tomography. Int Endod J 2017; 51:357-363. [DOI: 10.1111/iej.12850] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Accepted: 08/24/2017] [Indexed: 01/02/2023]
Affiliation(s)
- T. Rödig
- Department of Preventive Dentistry; Periodontology and Cariology; University Medical Center Göttingen; Göttingen Germany
| | - C. Müller
- Department of Preventive Dentistry; Periodontology and Cariology; University Medical Center Göttingen; Göttingen Germany
| | - M. Hoch
- Department of Preventive Dentistry; Periodontology and Cariology; University Medical Center Göttingen; Göttingen Germany
| | - F. Haupt
- Department of Preventive Dentistry; Periodontology and Cariology; University Medical Center Göttingen; Göttingen Germany
| | - X. Schulz
- Department of Medical Statistics; University Medical Center Göttingen; Göttingen Germany
| | - A. Wiegand
- Department of Preventive Dentistry; Periodontology and Cariology; University Medical Center Göttingen; Göttingen Germany
| | - M. Rizk
- Department of Preventive Dentistry; Periodontology and Cariology; University Medical Center Göttingen; Göttingen Germany
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Ghanem C, Taillandier P, Rizk M, Rizk Z, Nehme N, Souchard J, El Rayess Y. Analysis of the impact of fining agents types, oenological tannins and mannoproteins and their concentrations on the phenolic composition of red wine. Lebensm Wiss Technol 2017. [DOI: 10.1016/j.lwt.2017.05.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Rizk M, Hohlfeld L, Thanh LT, Biehl R, Lühmann N, Mohn D, Wiegand A. Bioactivity and properties of a dental adhesive functionalized with polyhedral oligomeric silsesquioxanes (POSS) and bioactive glass. Dent Mater 2017; 33:1056-1065. [DOI: 10.1016/j.dental.2017.06.012] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Revised: 05/05/2017] [Accepted: 06/22/2017] [Indexed: 02/09/2023]
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Rizk M, Krutyeva M, Lühmann N, Allgaier J, Radulescu A, Pyckhout-Hintzen W, Wischnewski A, Richter D. A Small-Angle Neutron Scattering Study of a Soft Model Nanofiller in an Athermal Melt. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b00336] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- M. Rizk
- Jülich Centre for Neutron Science (JCNS) & Institute for Complex Systems (ICS), Forschungszentrum Jülich GmbH, Jülich, Germany
- Department
of Preventive Dentistry, Periodontology and Cariology, University of Göttingen, Göttingen, Germany
| | - M. Krutyeva
- Jülich Centre for Neutron Science (JCNS) & Institute for Complex Systems (ICS), Forschungszentrum Jülich GmbH, Jülich, Germany
| | - N. Lühmann
- Jülich Centre for Neutron Science (JCNS) & Institute for Complex Systems (ICS), Forschungszentrum Jülich GmbH, Jülich, Germany
| | - J. Allgaier
- Jülich Centre for Neutron Science (JCNS) & Institute for Complex Systems (ICS), Forschungszentrum Jülich GmbH, Jülich, Germany
| | - A. Radulescu
- Jülich
Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum
(MLZ), Forschungszentrum Jülich GmbH, Garching, Germany
| | - W. Pyckhout-Hintzen
- Jülich Centre for Neutron Science (JCNS) & Institute for Complex Systems (ICS), Forschungszentrum Jülich GmbH, Jülich, Germany
| | - A. Wischnewski
- Jülich Centre for Neutron Science (JCNS) & Institute for Complex Systems (ICS), Forschungszentrum Jülich GmbH, Jülich, Germany
| | - D. Richter
- Jülich Centre for Neutron Science (JCNS) & Institute for Complex Systems (ICS), Forschungszentrum Jülich GmbH, Jülich, Germany
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Hamdan AL, Rizk M, Ayoub C, Ziade G. Injection laryngoplasty through a transoral approach using the Guedel oral airway. Acta Otorhinolaryngol Ital 2017; 37:444-446. [PMID: 28530260 PMCID: PMC5720873 DOI: 10.14639/0392-100x-1193] [Citation(s) in RCA: 3] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/02/2016] [Accepted: 12/23/2016] [Indexed: 12/04/2022]
Abstract
Injection laryngoplasty has gained popularity as a treatment modality for glottal insufficiency. Several approaches have been described, specifically transcutaneous, transoral and transnasal. The authors describe a novel technique performed successfully on three subjects, namely endoscopic injection laryngoplasty using the modified Guedel oral airway. There was marked improvement in dysphonia, maximum phonation time and closed quotient in all three subjects with a decrease in the Voice Handicap Index-10 score. This new approach is a viable approach for the treatment of glottal insufficiency.
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Affiliation(s)
- A L Hamdan
- Department of Otolaryngology, Head & Neck Surgery, American University of Beirut Medical Center, Beirut- Lebanon
| | - M Rizk
- Department of Anesthesiology, American University of Beirut Medical Center, Beirut-Lebanon
| | - C Ayoub
- Department of Anesthesiology, American University of Beirut Medical Center, Beirut-Lebanon
| | - G Ziade
- Department of Otolaryngology, Head & Neck Surgery, American University of Beirut Medical Center, Beirut- Lebanon
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Rizk M, Verriele M, Dusanter S, Schoemaecker C, Le Calve S, Locoge N. Fast sorption measurements of volatile organic compounds on building materials: Part 1 - Methodology developed for field applications. Data Brief 2016; 6:953-8. [PMID: 26937475 PMCID: PMC4753388 DOI: 10.1016/j.dib.2016.01.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2015] [Accepted: 01/04/2016] [Indexed: 11/19/2022] Open
Abstract
A Proton Transfer Reaction-Mass Spectrometer (PTR-MS) has been coupled to the outlet of a Field and Laboratory Emission Cell (FLEC), to measure volatile organic compounds (VOC) concentration during a sorption experiments (Rizk et al., this issue) [1]. The limits of detection of the PTR-MS for three VOCs are presented for different time resolution (2, 10 and 20 s). The mass transfer coefficient was calculated in the FLEC cavity for the different flow rates. The concentration profile obtained from a sorption experiment performed on a gypsum board and a vinyl flooring are also presented in comparison with the profile obtained for a Pyrex glass used as a material that do not present any sorption behavior (no sink). Finally, the correlation between the concentration of VOCs adsorbed on the surface of the gypsum board at equilibrium (Cse) and the concentration of VOCs Ce measured in the gas phase at equilibrium is presented for benzene, C8 aromatics and toluene.
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Affiliation(s)
- M. Rizk
- Mines Douai, SAGE, F-59508 Douai, France
- Université de Lille, F-59000 Lille, France
- Université de Strasbourg/CNRS, Institut de Chimie et Procédés pour l’Energie, l’Environnement et la Santé (ICPEES), UMR 7515, F-67087 Strasbourg, France
- Corresponding author.
| | - M. Verriele
- Mines Douai, SAGE, F-59508 Douai, France
- Université de Lille, F-59000 Lille, France
| | - S. Dusanter
- Mines Douai, SAGE, F-59508 Douai, France
- Université de Lille, F-59000 Lille, France
| | - C. Schoemaecker
- Université de Lille 1, Laboratoire de Physico-chimie des Processus de Combustion et de l׳Atmosphère, Villeneuve d׳Ascq, France
| | - S. Le Calve
- Université de Strasbourg/CNRS, Institut de Chimie et Procédés pour l’Energie, l’Environnement et la Santé (ICPEES), UMR 7515, F-67087 Strasbourg, France
| | - N. Locoge
- Mines Douai, SAGE, F-59508 Douai, France
- Université de Lille, F-59000 Lille, France
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El-Enany N, Belal F, Rizk M. Spectrophotometric Determination of Thioctic Acid in its Dosage Forms through Complex Formation with Pd(II). J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200700135] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Rizk M, Ibrahim F, Hefnawy M, Nasr JJ. Fourth Order Derivative Spectrophotometric Determination of Benzyl Alcohol in Piroxicam Injections. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200600102] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Rizk M, Ibrahim N, El-Rigal N. Comparative in vivo antioxidant levels in Schistosoma mansoni infected mice treated with praziquantel or the essential oil of Melaleuca armillaris leaves. Pak J Biol Sci 2012; 15:971-978. [PMID: 24199475 DOI: 10.3923/pjbs.2012.971.978] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Plant extracts are continuously investigated for their extensive inclusion of biologically active constituents that exert therapeutic activities against many diseases. The aim of this study was to assess the antioxidant/anti-schistosomal activities of the essential oil of the fresh leaves of Melaleuca armillaris (M. armillaris) compared to Praziquantel (PZQ) on normal and Schistosoma mansoni-infected mice. The oil was isolated by hydrodistillation and analyzed by gas chromatography/mass spectrometry (GC/MS). The oil was rich in 1,8-cineole (33.93%), terpinen-4-ol (18.79%), limonene (10.37%) and B-pinene (6.59%). M. armillaris oil (150 mg kg(-1), orally) was administered from the second week post infection twice per week for six weeks. PZQ (500 mg kg(-1), orally) was administered for two successive days 8 weeks post infection and mice sacrificed one week later. Total protein, Malondialdehyde (MDA), Glutathione (GSH), vitamins C and E, the antioxidant enzymes catalase and superoxide dismutase, as well as liver weights and liver/body weight were determined in the liver tissues. Results showed that, both treatments significantly ameliorated the disturbed levels ofGSH and MDA in infected mice. Both vitamins were significantly elevated after treatment with the oil while a significant increase in catalase accompanied by a pronounced decrease in SOD were obtained after treatment with PZQ. Both treatments markedly improved liver and body weights in infected mice compared to the infected-untreated ones. In conclusion, natural plant sources may be used as promising alternative agents to chemical drugs for schistosomiasis treatment, since the latter may result in drug-induced resistance arising from repeated use.
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Affiliation(s)
- M Rizk
- Department of Therapeutical Chemistry, Egypt
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Atreja A, Rizk M. Capturing patient reported outcomes and quality of life in routine clinical practice: ready for prime time? MINERVA GASTROENTERO 2012; 58:19-24. [PMID: 22419001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
AIM Aim of the present study was to assess the feasibility of using internet-tablets to capture patient reported outcomes (PRO) questionnaire in a busy gastroenterology clinic, and determine predictors of questionnaire completion. PRO and quality of life instruments are extensively used to estimate the burden of disease and as end-points in clinical trials. However, their collection by paper can be costly, prone to human errors, and inefficient. We hypothesized that the majority of patients, irrespective of age, gender or ethnicity, will be able to complete PRO questionnaires on Internet tablets in a timely manner with good levels of satisfaction. METHODS Internet-enabled tablets were used to collect PRO, and summative scores of quality of life provided to physicians. Predictors of completion were first assessed univariately and then by multivariate analysis using automated stepwise selection method on 1,000 bootstrap samples. Patient satisfaction was assessed using 5 item Likert-like scale. RESULTS During the 12 week period, 1625 patient visits (mean age 49.8 ± 14.3 years, females 55.2% and Whites 82.5%) entered PRO data into tablets, of which 1396 (85.9%) visits had complete response. Average completion time of PRO questionnaire was less than 10 minutes (9.3 minutes ± 7.0). Majority of the patients found tablets easy to use (69.7%) and preferred it over paper-based questionnaires (70.8%). Multivariate analysis showed that subjects who were white Caucasians (odds ratio [OR] 1.9; P=0.004), had higher Cleveland Clinic Global Quality of Life (OR 2.2; P=0.027), or had either IBD or liver disease, were more likely to complete questionnaire (OR 4.0; P=0.001). CONCLUSION Collection of PROs in gastroenterology clinics using internet-tablets is feasible without any additional overhead, and with good levels of patient satisfaction and completion rates.
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Affiliation(s)
- A Atreja
- Department of Gastroenterology, Digestive Disease Institute Cleveland Clinic, Cleveland, OH, USA.
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Walash MI, Rizk M, Sheribah ZA, Salim MM. Development and Validation of Spectrofluorimetric Method for Determination of Biotin in Bulk and Pharmaceutical Preparations via its Oxidation with Cerium (IV). Int J Biomed Sci 2010; 6:268-75. [PMID: 23675202 PMCID: PMC3615271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/05/2008] [Accepted: 07/28/2010] [Indexed: 11/25/2022]
Abstract
A simple and sensitive spectrofluorimetric method was developed for the determination of biotin in pure form and in pharmaceutical preparations. The proposed method is based on the oxidation of the drug with cerium (IV) ammonium sulfate in acidic medium. The fluorescence of the produced Cerium (III) was measured at 365 nm after excitation at 255 nm. The different experimental parameters affecting the development and stability of the reaction were carefully studied and optimized. The method is applicable over the concentration range of 30-120 ng/mL with correlation coefficient of 0.9998. The detection limit (LOD) of biotin was 2.41 ng/mL while quantitation limit (LOQ) was 7.29 ng/mL. The proposed procedure was successfully applied for the determination of biotin in pharmaceutical preparations with mean recoveries of 99.55 ± 0.83 and 101.67 ± 1.53 for biotin ampoules and capsules, respectively. The results obtained were in good agreement with those obtained using the official method.
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Khairy M, Al-Oraby N, Abdhady M, Ramadan M, Rizk M, Farag M. P725 A novel non-invasive management of contraception with dysfunctional uterine bleeding (DUB): indomethacin releasing copper device (IR Cu IUD). Int J Gynaecol Obstet 2009. [DOI: 10.1016/s0020-7292(09)62216-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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El-Enany N, Belal F, El-Shabrawy Y, Rizk M. Second derivative synchronous fluorescence spectroscopy for the simultaneous determination of chlorzoxazone and Ibuprofen in pharmaceutical preparations and biological fluids. Int J Biomed Sci 2009; 5:136-45. [PMID: 23675128 PMCID: PMC3614762] [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: 09/10/2008] [Accepted: 10/29/2008] [Indexed: 12/05/2022]
Abstract
A rapid, simple and highly sensitive second derivative synchronous fluorometric method has been developed for the simultaneous analysis of binary mixture of chlorzoxazone (CLZ) and ibuprofen (IP). The method is based upon measurement of the synchronous fluorescence intensity of these drugs at Δλ=60 nm in methanol. The different experimental parameters affecting the fluorescence of the two drugs were carefully studied and optimized. The fluorescence-concentration plots were rectilinear over the range of 0.2-4 μg/mL and 0.1-1.6 μg/mL for CLZ and IP, respectively with lower detection limits (LOD) of 0.028 and 8.3 × 10(-3) μg/mL and quantification limits (LOQ) of 0.086 and 0.03 μg/mL for CLZ and IP, respectively. The proposed method was successfully applied for the determination of the two compounds in synthetic mixtures and in commercial capsules. The high sensitivity attained by the proposed method allowed the determination of both drugs and real human plasma samples. The mean % recoveries in real human plasma (n=3) were 87.69 ± 6.15 and 92.57 ± 4.39 for each of CLZ and IP respectively.
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Affiliation(s)
- N. El-Enany
- Department of Analytical Chemistry, Faculty of Pharmacy, University of Mansoura, Mansoura, Egypt;
| | - F. Belal
- Department of Analytical Chemistry, Faculty of Pharmacy, University of Mansoura, Mansoura, Egypt;
| | - Y. El-Shabrawy
- Faculty of Pharmacy and Health Science, Ajman University of Science and Technology, United Arab Emirates;
| | - M. Rizk
- Department of Analytical Chemistry, Faculty of Pharmacy, University of Helwan, Cairo, Egypt.
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Walash MI, Rizk M, Sheribah ZA, Salim MM. Kinetic spectrophotometric determination of biotin in pharmaceutical preparations. Int J Biomed Sci 2008; 4:238-44. [PMID: 23675096 PMCID: PMC3614710] [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: 07/10/2008] [Accepted: 08/17/2008] [Indexed: 12/03/2022]
Abstract
A simple accurate kinetic spectrophotometric method was developed for the determination of biotin in pure form and pharmaceutical preparations. The proposed method is based on a catalytic acceleration of biotin on the reaction between sodium azide and tri-iodide in an aqueous solution. Concentration range of 4-16 μg/mL for biotin was determined by measuring the decrease in the absorbance of tri-iodide at 348 nm by a fixed time method. The decrease in absorbance after 14 min from the initiation of the reaction was markedly correlated to the concentration with correlation coefficient of 0.9999. The detection limit (LOD) of biotin was 0.18 μg/mL while quantitation limit (LOQ) was 0.54 μg/mL. The percentage recovery of the spiked samples was 100.08 ± 0.761. The proposed procedure was successfully applied for the determination of biotin in its pharmaceutical preparations with mean recoveries of 101.17 ± 2.05 and 97.87 ± 1.50 for biotin ampoules and capsules, respectively. The results obtained were in good agreement with those obtained using official method.
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Affiliation(s)
- M I Walash
- Analytical Chemistry Department, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt
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EL-Enany N, Belal F, Rizk M. The alternating current polarographic behavior and determination of lansoprazole and omeprazole in dosage forms and biological fluids. ACTA ACUST UNITED AC 2008; 70:889-96. [DOI: 10.1016/j.jprot.2008.02.002] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2007] [Revised: 10/23/2007] [Accepted: 02/20/2008] [Indexed: 11/16/2022]
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Rizk M, Walash MI, Abou-ouf AA, Belal F. Evaluation of Certain Pharmaceuticals with Dibromohydantion. V. Determination of Penicillins. ANAL LETT 2007. [DOI: 10.1080/00032718108081469] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Ahmed S, Rizk M, Belal F, Ibrahim F, Sheribah ZA. Stability‐Indicating HPLC Method for Captopril Through Pre‐Column Derivatization with Pd(II). J LIQ CHROMATOGR R T 2007. [DOI: 10.1080/10826070500478999] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- S. Ahmed
- a Department of Analytical Chemistry, Faculty of Pharmacy , University of Mansoura , Mansoura , Egypt
| | - M. Rizk
- a Department of Analytical Chemistry, Faculty of Pharmacy , University of Mansoura , Mansoura , Egypt
| | - F. Belal
- a Department of Analytical Chemistry, Faculty of Pharmacy , University of Mansoura , Mansoura , Egypt
| | - F. Ibrahim
- a Department of Analytical Chemistry, Faculty of Pharmacy , University of Mansoura , Mansoura , Egypt
| | - Z. A. Sheribah
- a Department of Analytical Chemistry, Faculty of Pharmacy , University of Mansoura , Mansoura , Egypt
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