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Córdova-Fraga T, García-Pérez M, Hernández-Rayas A, Gómez-Solís C, Soto-Álvarez JA, Oliva J. Bone samples' behavior in sunlight, IR light, and temperature increase with FEM simulation. Med Biol Eng Comput 2024; 62:225-236. [PMID: 37770813 DOI: 10.1007/s11517-023-02929-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Accepted: 09/05/2023] [Indexed: 09/30/2023]
Abstract
Biological and environmental factors produce biochemical processes that modify the bone structure. A few studies have attempted to show the adverse biological effects of sun radiation. The bone tissue exposures to infrared and sunlight radiation are analyzed by using focused sound, characterization spectroscopy techniques, and image processing. The study is complemented with a finite element method simulation on temperature behaviors. The crystal morphology on the bone hydroxyapatite and functional groups was characterized by X-ray diffraction and infrared spectroscopy. The infrared spectra confirmed the hydroxyl group of bovine hydroxyapatite, amines, and lipids are also correlated with modifications of the hydroxyapatite. The diffractograms showed the characteristic peaks of hydroxyapatite, with the main intensity at 2θ = 32.02°. Bone samples exposed to sun radiation presented a peak at 2θ = 27.5°, evidencing the possible formation of β-TCP y α-TCP. The analysis with the spectroscopy techniques about the structural changes in the samples suggests interpreting an increase of sound obtained by expanding the exposure time. It is possible to verify that there are some structural changes in the bone samples due to exposure to non-ionizing radiation. These results show an increase in the registered intensity sound correlated with the interpretation of the structural changes of bone. Thanks to the different novel analysis techniques established in the present study, it could establish the changes that experienced the bone structure under different sources of radiation, which will help to better detect scenarios of bone deficiency.
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Affiliation(s)
- Teodoro Córdova-Fraga
- Departamento de Ingeniería Física - DCI, Universidad de Guanajuato Campus León Loma del Bosque 103, Lomas del Campestre, 37150, León, GTO, Mexico.
| | - Marysol García-Pérez
- Departamento de Ingeniería Física - DCI, Universidad de Guanajuato Campus León Loma del Bosque 103, Lomas del Campestre, 37150, León, GTO, Mexico
| | - Angélica Hernández-Rayas
- Departamento de Ingeniería Física - DCI, Universidad de Guanajuato Campus León Loma del Bosque 103, Lomas del Campestre, 37150, León, GTO, Mexico
| | - Christian Gómez-Solís
- Departamento de Ingeniería Física - DCI, Universidad de Guanajuato Campus León Loma del Bosque 103, Lomas del Campestre, 37150, León, GTO, Mexico
| | - José Alfredo Soto-Álvarez
- Departamento de Ingeniería Física - DCI, Universidad de Guanajuato Campus León Loma del Bosque 103, Lomas del Campestre, 37150, León, GTO, Mexico
| | - Jorge Oliva
- Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Juriquilla, Querétaro, 76230, Mexico
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Alecu AE, Balaceanu GC, Nicoara AI, Neacsu IA, Busuioc C. Synthesis and Characterization of Porous Forsterite Ceramics with Prospective Tissue Engineering Applications. MATERIALS (BASEL, SWITZERLAND) 2022; 15:6942. [PMID: 36234283 PMCID: PMC9571972 DOI: 10.3390/ma15196942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 10/03/2022] [Accepted: 10/03/2022] [Indexed: 06/16/2023]
Abstract
Due to the urgent need to develop and improve biomaterials, the present article proposes a new strategy to obtain porous scaffolds based on forsterite (Mg2SiO4) for bone tissue regeneration. The main objective is to restore and improve bone function, providing a stable environment for regeneration. The usage of magnesium silicate relies on its mechanical properties being superior to hydroxyapatite and, in general, to calcium phosphates, as well as its high biocompatibility, and antibacterial properties. Mg2SiO4 powder was obtained using the sol-gel method, which was calcinated at 800 °C for 2 h; then, part of the powder was further used to make porous ceramics by mixing it with a porogenic agent (e.g., sucrose). The raw ceramic bodies were subjected to two sintering treatments, at 1250 or 1320 °C, and the characterization results were discussed comparatively. The porogenic agent did not influence the identified phases or the samples' crystallinity and was efficiently removed during the heat treatment. Moreover, the effect of the porogenic agent no longer seems significant after sintering at 1250 °C; the difference in porosity between the two ceramics was negligible. When analysing the in vitro cytotoxicity of the samples, the ones that were porous and treated at 1320 °C showed slightly better cell viability, with the cells appearing to adhere more easily to their surface.
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Affiliation(s)
- Andrada Elena Alecu
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Chemical Engineering and Biotechnologies, University Politehnica of Bucharest, 011061 Bucharest, Romania
| | - Gabriel-Costin Balaceanu
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Chemical Engineering and Biotechnologies, University Politehnica of Bucharest, 011061 Bucharest, Romania
| | - Adrian Ionut Nicoara
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Chemical Engineering and Biotechnologies, University Politehnica of Bucharest, 011061 Bucharest, Romania
- National Research Center for Micro and Nanomaterials, Faculty of Chemical Engineering and Biotechnologies, University Politehnica of Bucharest, University Politehnica of Bucharest, 060042 Bucharest, Romania
| | - Ionela Andreea Neacsu
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Chemical Engineering and Biotechnologies, University Politehnica of Bucharest, 011061 Bucharest, Romania
- National Research Center for Micro and Nanomaterials, Faculty of Chemical Engineering and Biotechnologies, University Politehnica of Bucharest, University Politehnica of Bucharest, 060042 Bucharest, Romania
| | - Cristina Busuioc
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Chemical Engineering and Biotechnologies, University Politehnica of Bucharest, 011061 Bucharest, Romania
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Marín-Miranda M, Juárez-López ML, Espinosa-Bautista A. [Photoelastic models applied to dental restorations]. REVISTA CIENTÍFICA ODONTOLÓGICA 2021; 9:e084. [PMID: 38463724 PMCID: PMC10919810 DOI: 10.21142/2523-2754-0904-2021-084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Accepted: 12/01/2021] [Indexed: 03/12/2024] Open
Abstract
Objective To improve the understanding of the changes generated by restorative procedures through photoelastic models. Dental reconstruction should be based on principles of occlusion in order not to cause premature contact points during preparation and restoration procedures that can lead to disorders such as occlusal trauma, temporo-mandibullary joint dysfunction, or fractures. This paper presents a didactic method to objectively visualize occlusal loads and their distribution. Materials and methods Photoelastic models of teeth and maxillary segments were made to visualize the effects of dental preparations and restorations, as well as the wear of premature contact points. Results The direction, intensity and distribution of stresses in the crown and bone support were analyzed by photoelasticity. Conclusions The technique allows visualization of how the structures are affected from the cavity preparation, the different stresses with diamond or carbide burs, in addition to observing how a premature contact point not only affects the organ that contains it but also the surrounding structures.
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Affiliation(s)
- Miriam Marín-Miranda
- Facultad de Estudios Superiores Zaragoza, Universidad Nacional Autónoma de México. Ciudad de México, México. , Universidad Nacional Autónoma de México Facultad de Estudios Superiores Zaragoza Universidad Nacional Autónoma de México Ciudad de México Mexico
| | - María Lilia Juárez-López
- Facultad de Estudios Superiores Zaragoza, Universidad Nacional Autónoma de México. Ciudad de México, México. , Universidad Nacional Autónoma de México Facultad de Estudios Superiores Zaragoza Universidad Nacional Autónoma de México Ciudad de México Mexico
| | - Adrián Espinosa-Bautista
- Facultad de Ingeniería, Universidad Nacional Autónoma de México. Ciudad de México, México. Universidad Nacional Autónoma de México Facultad de Ingeniería Universidad Nacional Autónoma de México Ciudad de México Mexico
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Montaño CJ, Campos TPR, Lemos BRS, Yoshida MI, Almeida NGS, Aguilar MTP, Lima CV. Effects of hydroxyapatite on PMMA-HAp cement for biomedical applications. Biomed Mater Eng 2020; 31:191-201. [PMID: 32568169 DOI: 10.3233/bme-206001] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
OBJECTIVE The main goal of this study was to examine the influence of hydroxyapatite (HAp) macroaggreate concentrations on thermal and mechanical properties of radioactive bone cement and to study the relation of glass transition Tg with its mechanical properties. METHODS The bone cement as (1-x)PMMA-xHAp binary system was prepared in six [x] distinct concentration parameters of 0.0 up to 0.5. The HAp was synthesized using a solgel procedure following calcination by thermal treatment. The composite was prepared in cold based (non-radioactive) mixing polymethyl methacrylate (PMMA) and HAp. Differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and mechanical compressive strength (CS) were used to measure the thermal and mechanical properties. RESULTS The DSC and TGA thermal profiles in function to concentration parameter [x] were presented. The CS lies in a range of 3.71-7.37 MPa and the glass transition temperature Tg = 126.27 °C. There was a direct relationship between the PMMA-HAp thermoplastic properties with mechanical and thermal properties in function of HAp concentrations. CONCLUSION The specific PMMA-HAp composite, with a concentration ratio of 1:1 and HAp thermal treatment at the Tg, provides a material with a compression strength of 7.37 MPa and a suitable amount of porous similar to a trabecular bone, possible to apply in bone cement implants, regardless of whether they are radioactive or not.
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Affiliation(s)
- C J Montaño
- Departamento de Engenharia Nuclear, Universidade Federal de Minas Gerais, Campus Pampulha, Belo Horizonte, Brazil E-mails: , ,
| | - T P R Campos
- Departamento de Engenharia Nuclear, Universidade Federal de Minas Gerais, Campus Pampulha, Belo Horizonte, Brazil E-mails: , ,
| | - B R S Lemos
- Departamento de Química, Universidade Federal de Minas Gerais, Campus Pampulha, Belo Horizonte, Brazil E-mails: ,
| | - M I Yoshida
- Departamento de Química, Universidade Federal de Minas Gerais, Campus Pampulha, Belo Horizonte, Brazil E-mails: ,
| | - N G S Almeida
- Departamento de Engenharia Metalúrgica de Materiais, Universidade Federal de Minas Gerais, Campus Pampulha, Belo Horizonte, Brazil E-mail:
| | - M T P Aguilar
- Departamento de Materiais e Construção, Universidade Federal de Minas Gerais, Campus Pampulha, Belo Horizonte, Brazil E-mail:
| | - C V Lima
- Departamento de Engenharia Nuclear, Universidade Federal de Minas Gerais, Campus Pampulha, Belo Horizonte, Brazil E-mails: , ,
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Quintero-García M, Gutiérrez-Cortez E, Rojas-Molina A, Mendoza-Ávila M, Del Real A, Rubio E, Jiménez-Mendoza D, Rojas-Molina I. Calcium Bioavailability of Opuntia ficus-indica Cladodes in an Ovariectomized Rat Model of Postmenopausal Bone Loss. Nutrients 2020; 12:E1431. [PMID: 32429103 PMCID: PMC7284886 DOI: 10.3390/nu12051431] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Revised: 05/08/2020] [Accepted: 05/12/2020] [Indexed: 01/01/2023] Open
Abstract
Osteoporosis is a disease of the skeletal system characterized by low bone mass and bone weakening, which increase the risk of fracture. This disease is associated with menopause because hypoestrogenism induces the maturation and activation of osteoclasts. In addition, a low dietary intake of calcium leads to low bone mineral density and postmenopausal osteoporosis. The objectives of this work were to determine calcium bioavailability of Opuntia ficus-indica cladodes at a late maturity stage and to assess its contribution in improving bone health in an ovariectomized rat model. Two-month-old Wistar female rats (n = 35) were used and distributed in seven experimental groups: (i) control group (Crtl), (ii) sham group (SH), (iii) ovariectomized group (OVX), (iv) ovariectomized group supplemented with calcium citrate (CCa), (v) ovariectomized group supplemented with O. ficus-indica powder (NI), (vi) ovariectomized group supplemented with soluble fiber from O. ficus-indica (FS) and (vii) ovariectomized group supplemented with insoluble fiber from O. ficus-indica (FI). Our results showed that calcium in the soluble fiber of O. ficus-indica is bioavailable and contributes to improve the physical, densitometric, biomechanical and microstructural properties of bones in ovariectomized rats. These findings indicated that O. ficus-indica cladodes at a late maturity stage represent a good source of bioavailable calcium and consumption of these cladodes might be beneficial for the prevention of osteoporosis and other bone diseases.
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Affiliation(s)
- Michelle Quintero-García
- Programa de Maestría en Ciencias Químico Biológicas, Facultad de Química, Universidad Autónoma de Querétaro, Cerro de las Campanas S/N, Querétaro C.P. 76010, Mexico;
- Laboratorio de Química Medicinal, Facultad de Química, Universidad Autónoma de Querétaro, Cerro de las Campanas S/N, Querétaro C.P. 76010, Mexico;
| | - Elsa Gutiérrez-Cortez
- Laboratorio de procesos de transformación y tecnologías emergentes en alimentos, Facultad de Estudios Superiores-Cuautitlán, Universidad Nacional Autónoma de México, Km 2.5 Carretera Cuautitlán–Teoloyucan, San Sebastián Xhala, Cuautitlán-Izcalli C.P. 54714, Mexico;
| | - Alejandra Rojas-Molina
- Laboratorio de Química Medicinal, Facultad de Química, Universidad Autónoma de Querétaro, Cerro de las Campanas S/N, Querétaro C.P. 76010, Mexico;
| | - Monsserrat Mendoza-Ávila
- Programa de Maestría en Ciencias de la Nutrición Humana, Facultad de Ciencias Naturales, Universidad Autónoma de Querétaro, Av. de las Ciencias S/N, Juriquilla C.P. 76230, Querétaro, Mexico;
| | - Alicia Del Real
- Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Juriquilla C.P. 7600, Querétaro, Mexico;
| | - Efraín Rubio
- Centro Universitario de Vinculación y Transferencia de Tecnología, Benemérita Universidad Autónoma de Puebla, Centro Universitario, Col. San Manuel S/N, Puebla C.P. 72540, Mexico;
| | - Daniel Jiménez-Mendoza
- Departamento de Ingeniería Física, División de Ciencias e Ingenierías, Universidad de Guanajuato, Campus León, Lomas del Bosque 103, Col. Lomas del Campestre, León C.P. 37150, Guanajuato, Mexico;
- Departamento de Ingeniería Electromecánica, Tecnológico Nacional de México/ITS de Purísima del Rincón. Blvd. Del Valle 2301, Col. Guardarrayas, Purísima del Rincón C.P. 36413, Guanajuato, Mexico
| | - Isela Rojas-Molina
- Laboratorio de Química Medicinal, Facultad de Química, Universidad Autónoma de Querétaro, Cerro de las Campanas S/N, Querétaro C.P. 76010, Mexico;
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Figueirido B, Lautenschlager S, Pérez-Ramos A, Van Valkenburgh B. Distinct Predatory Behaviors in Scimitar- and Dirk-Toothed Sabertooth Cats. Curr Biol 2018; 28:3260-3266.e3. [DOI: 10.1016/j.cub.2018.08.012] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2018] [Revised: 05/14/2018] [Accepted: 08/02/2018] [Indexed: 11/27/2022]
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