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Fangaia SIG, Silva DSA, Messias A, Nicolau PMG, Valente AJM, Rodrigo MM, Ribeiro ACF. Transport Properties in Multicomponent Systems Containing Cyclodextrins and Nickel Ions. Int J Mol Sci 2024; 25:4328. [PMID: 38673912 PMCID: PMC11050376 DOI: 10.3390/ijms25084328] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2024] [Revised: 04/08/2024] [Accepted: 04/11/2024] [Indexed: 04/28/2024] Open
Abstract
In this work, we propose a comprehensive experimental study of the diffusion of nickel ions in combination with different cyclodextrins as carrier molecules for enhanced solubility and facilitated transport. For this, ternary mutual diffusion coefficients measured by Taylor dispersion method are reported for aqueous solutions containing nickel salts and different cyclodextrins (that is, α-CD, β-CD, and γ-CD) at 298.15 K. A combination of Taylor dispersion and other methods, such as UV-vis spectroscopy, will be used to obtain complementary information on these systems. The determination of the physicochemical properties of these salts with CDs in aqueous solution provides information that allows us to understand solute-solvent interactions, and gives a significant contribution to understanding the mechanisms underlying diffusional transport in aqueous solutions, and, consequently, to mitigating the potential toxicity associated with these metal ions. For example, using mutual diffusion data, it is possible to estimate the number of moles of each ion transported per mole of the cyclodextrin driven by its own concentration gradient.
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Affiliation(s)
- Sónia I. G. Fangaia
- Faculty of Medicine, Institute of Implantology and Prosthodontics, University of Coimbra, 3000-075 Coimbra, Portugal; (S.I.G.F.); (A.M.); (P.M.G.N.)
- Center for Innovation and Research in Oral Sciences (CIROS), Faculty of Medicine, University of Coimbra, 3000-075 Coimbra, Portugal
- CQC, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal; (D.S.A.S.); (A.J.M.V.)
| | - Daniela S. A. Silva
- CQC, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal; (D.S.A.S.); (A.J.M.V.)
| | - Ana Messias
- Faculty of Medicine, Institute of Implantology and Prosthodontics, University of Coimbra, 3000-075 Coimbra, Portugal; (S.I.G.F.); (A.M.); (P.M.G.N.)
- Center of Mechanical Engineering Materials and Processes (CEMMPRE), Departamento de Engenharia Mecânica, University of Coimbra, 3030-788 Coimbra, Portugal
| | - Pedro M. G. Nicolau
- Faculty of Medicine, Institute of Implantology and Prosthodontics, University of Coimbra, 3000-075 Coimbra, Portugal; (S.I.G.F.); (A.M.); (P.M.G.N.)
- Center for Innovation and Research in Oral Sciences (CIROS), Faculty of Medicine, University of Coimbra, 3000-075 Coimbra, Portugal
| | - Artur J. M. Valente
- CQC, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal; (D.S.A.S.); (A.J.M.V.)
| | - M. Melia Rodrigo
- Universidad de Alcalá, Departamento de Química Analítica, Química Física e Ingeniería Química, 28805 Alcalá de Henares, Spain;
| | - Ana C. F. Ribeiro
- CQC, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal; (D.S.A.S.); (A.J.M.V.)
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Fangaia SIG, Cabral AMTDPV, Nicolau PMG, Guerra FADRA, Rodrigo MM, Ribeiro ACF, Valente AJM, Esteso MA. Diffusion of Vanadium Ions in Artificial Saliva and Its Elimination from the Oral Cavity by Pharmacological Compounds Present in Mouthwashes. Biomolecules 2022; 12:biom12070947. [PMID: 35883503 PMCID: PMC9312900 DOI: 10.3390/biom12070947] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Revised: 06/28/2022] [Accepted: 06/30/2022] [Indexed: 11/16/2022] Open
Abstract
In this study, diffusion coefficients of ammonium vanadate at tracer concentrations in artificial saliva with and without sodium fluoride, at different pH values, were measured using an experimental model based on the Taylor dispersion technique. Ternary mutual diffusion coefficients (D11, D22, D12, and D21) for four aqueous systems {NH4VO3 (component 1) + β-cyclodextrin (β-CD) (component 2),} {NH4VO3 (component 1) + β-cyclodextrin (HP-β-CD) (component 2)}, {NH4VO3 (component 1) + sodium dodecyl sulphate (SDS) (component 2)} and {NH4VO3 (component 1) + sodium hyaluronate (NaHy) (component 2)} at 25.00 °C were also measured by using the same technique. These data showed that diffusion of ammonium vanadate was strongly affected in all aqueous media studied. Furthermore, a significant coupled diffusion of this salt and β-CD was observed through the non-zero values of the cross-diffusion coefficients, D12, allowing us to conclude that there is a strong interaction between these two components. This finding is very promising considering the removal, from the oral cavity, of vanadium resulting from tribocorrosion of Ti-6Al-4V prosthetic devices.
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Affiliation(s)
- Sónia I. G. Fangaia
- Institute of Implantology and Prosthodontics, CIROS, Faculty of Medicine, University of Coimbra, 3000-075 Coimbra, Portugal; (P.M.G.N.); (F.A.D.R.A.G.)
- Correspondence: (S.I.G.F.); (A.C.F.R.)
| | - Ana M. T. D. P. V. Cabral
- Faculty of Pharmacy, University of Coimbra, 3000-548 Coimbra, Portugal;
- Department of Chemistry, CQC-IMS, Institute of Molecular Sciences, University of Coimbra, 3004-535 Coimbra, Portugal;
| | - Pedro M. G. Nicolau
- Institute of Implantology and Prosthodontics, CIROS, Faculty of Medicine, University of Coimbra, 3000-075 Coimbra, Portugal; (P.M.G.N.); (F.A.D.R.A.G.)
| | - Fernando A. D. R. A. Guerra
- Institute of Implantology and Prosthodontics, CIROS, Faculty of Medicine, University of Coimbra, 3000-075 Coimbra, Portugal; (P.M.G.N.); (F.A.D.R.A.G.)
| | - M. Melia Rodrigo
- U.D. Química Física, Universidad de Alcalá, 28805 Alcalá de Henares, Spain; (M.M.R.); (M.A.E.)
| | - Ana C. F. Ribeiro
- Department of Chemistry, CQC-IMS, Institute of Molecular Sciences, University of Coimbra, 3004-535 Coimbra, Portugal;
- Correspondence: (S.I.G.F.); (A.C.F.R.)
| | - Artur J. M. Valente
- Department of Chemistry, CQC-IMS, Institute of Molecular Sciences, University of Coimbra, 3004-535 Coimbra, Portugal;
| | - Miguel A. Esteso
- U.D. Química Física, Universidad de Alcalá, 28805 Alcalá de Henares, Spain; (M.M.R.); (M.A.E.)
- Universidad Católica de Ávila, 05005 Ávila, Spain
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Cunha P, Guevara MA, Messias A, Rocha S, Reis R, Nicolau PMG. A method for segmentation of dental implants and crestal bone. Int J Comput Assist Radiol Surg 2012; 8:711-21. [PMID: 23212460 DOI: 10.1007/s11548-012-0802-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2012] [Accepted: 11/14/2012] [Indexed: 11/30/2022]
Abstract
PURPOSE Medical imaging and in particular digital radiographic images offer a great deal of information to dentists in the clinical diagnosis and treatment processes on a daily basis. This paper presents a new method aimed to produce an accurate segmentation of dental implants and the crestal bone line in radiographic images. With this, it is possible computing several measures to biomechanical and clinical evaluation of dental implants positioning and evolution. METHODS The proposed segmentation method includes two major steps: (1) the preprocessing that combine denoising filters, morphological operations and histogram threshold techniques and (2) the final segmentation involving made-to-measure adjusted and trained active shape models for detecting the precise location of the intended structures. RESULTS Resulting measurements were compared to manual measurements made by experts on representative radiographs from patients. The calculated intraclass correlation coefficient was 0.75 and showed good reliability of the method, and the Bland-Altman analysis showed 95% of the values within the limits of agreement. The mean of the differences between the manual and method-driven measurements was 0.049 mm ([Formula: see text]) 95% CI, inferior to the established limit (0.15mm). CONCLUSIONS It was demonstrated that the method achieved a precise segmentation of the intended structures. The validation process on standardized periapical radiographs showed good agreement between the manual measurements and the ones produced by the new method. Future work will be focused on making the method more robust to densitometry changes and to validate the method on non-standardized radiographs.
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Affiliation(s)
- Pedro Cunha
- LOME-Laboratory of Optics and Experimental Mechanics, INEGI-Institute of Mechanical Engineering and Industrial Management, Faculty of Engineering, University of Porto, Porto, Portugal,
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