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Objectives: The purpose of this investigation was to determine the diffusion mechanism for water/ethanol mixtures in a diacrylate dental resin by direct observation of the absorbed liquid profiles using NMR microimaging.
Methods: Frequency-swept stray-field magnetic resonance imaging (STRAFI) was used. Solutions containing 25-65% by volume ethanol remained in contact with visible light cured 54% TEGDMA: 46% modified TUDMA sheets while measurements were made. The diffusion profiles were recorded periodically for diffusion times up to 10 h, to a depth of 360 microm and with readings taken at 24 microm intervals.
Results: For all liquid mixtures, diffusion was found to be Fickian with coefficients that increased progressively and smoothly with alcohol content in the diffusing mixture, from 2.4 x 10(-13) to 150 x 10(-13) m2 s(-1). A rule of mixtures approach, as suggested by Kwei and Zupko, gave a satisfactory description of the ethanol fraction dependence of the diffusivity.
Significance: Frequency-swept STRAFI offers a new and unique opportunity to produce spatially resolved measurements of the liquids in dental resins to high resolution. In this study, absorption was investigated since an understanding of its mechanism is fundamental to limiting consequent environmental degradation. STRAFI has great potential for other applications, for example drying, liquid exchange, etc. Since STRAFI can discriminate 1H in the liquid from those in softened polymer additional applications are envisaged.
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http://dx.doi.org/10.1016/s0109-5641(03)00006-x | DOI Listing |
Wiad Lek
December 2024
PROVINCIAL HOSPITAL NAMED AFTER SAINT LUKE, TARNOW, POLAND.
Injectable platelet-rich fibrin (i-PRF) is a novel platelet concentrate that has been employed in dentistry with the objective of promoting tissue regeneration and healing. In contrast to platelet-rich plasma (PRP), i-PRF is more straightforward to handle, more cost-effective, and free from anticoagulants, which reduces biochemical alterations. The i-PRF procedure was developed in 2014 by adjusting the centrifugation forces.
View Article and Find Full Text PDFWiad Lek
December 2024
IVANO-FRANKIVSK NATIONAL MEDICAL UNIVERSITY, IVANO-FRANKIVSK, UKRAINE.
Objective: Aim: To study the periodontal tissues and to establish the Magnesium content in oral liquid and capillary blood of young people with hypothyroidism from areas with Iodine deficiency.
Patients And Methods: Materials and Methods: In order to study the prevalence of periodontal disorders there were 330 people aged from 25 to 44 years from areas with natural Iodine deficiency enrolled in this examination. Primary hypothyroidism was diagnosed in 195 people (they made up the group I), and 135 people did not have any accompanying endocrine pathology (group II).
Free Radic Res
December 2024
Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya 466-8550, Japan.
Plasma, which was coined by Irving Langmuir in 1928, is the fourth physical state after the solid/liquid/gas phases. Low-temperature plasma (LTP) is a contradictory condition that involves high energy with free radicals at near-body temperatures and was developed through engineering in the 1990's. Research on LTP in engineering and medical fields has rapidly developed since the 2000's.
View Article and Find Full Text PDFJ Obstet Gynaecol Res
January 2025
Department of Obstetrics and Gynecology, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan.
Introduction: To identify prognostic biomarkers that could predict how well patients will respond to lenvatinib/pembrolizumab (LEN/PEM). The utility of certain inflammatory biomarkers in endometrial liquid-based cytology (LBC) or peripheral blood samples, such as neutrophil counts, lymphocyte counts, and neutrophil-to-lymphocyte ratio (NLR) were explored.
Methods: The study included 25 patients with advanced or recurrent endometrial cancer who had received LEN/PEM between August 2018 and March 2024.
Asian Biomed (Res Rev News)
December 2024
Department of Forensic Medicine, Graduate School of Medicine, Hokkaido University, Hokkaido 060-8638, Japan.
Background: Thiosulfate concentration in blood is an important indicator for the diagnosis of hydrogen sulfide poisoning. It may also be detected at high levels in postmortem decomposition cases.
Objectives: To determine the effect of postmortem decomposition on blood thiosulfate concentration and define precautions for diagnosing hydrogen sulfide poisoning based on thiosulfate concentration.
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