B-type carbonate apatite (CO3Ap) block may be an ideal artificial bone substitute because it is closer in chemical composition to bone mineral. In the present study, the feasibility to fabricate CO3Ap blocks was investigated using compositional transformation, which was based on the dissolution-precipitation reaction of a gypsum-calcite composite with free-molding behavior. For the compositional change, or phosphorization, gypsum-calcite composites of varying CaCO3 contents were immersed in 1 mol/L (NH4)3PO4 aqueous solution at 100 degrees C for 24 hours. No macroscopic changes were found after the treatment, whereas microscopic change was observed at SEM level. X-ray diffraction, Fourier transform infrared spectroscopy and CHN analysis indicated that the composites were B-type CO3Ap containing approximately 6-7 wt% of CO3, a value similar to that of biological bone apatite. Diametral tensile strength of the CO3Ap block was approximately 1-3 MPa. Based on the results obtained, it was therefore concluded that gypsum-calcite was a good candidate for the fabrication of CO3Ap blocks, coupled with the advantage that the composite can be molded to any shape by virtue of the setting property of gypsum.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.4012/dmj.27.710 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Characterisation of patients who develop atrial fibrillation-induced cardiomyopathy.
Open Heart
November 2024
William Harvey Research Institute, Queen Mary University of London, London, UK
Article Synopsis
- Atrial fibrillation-induced cardiomyopathy (AIC) is characterized by a drop in left ventricular ejection fraction (LVEF) due to AF, but the reasons why some patients develop AIC are still unclear.* -
- The study hypothesizes that subtle heart muscle issues exist before LVEF decreases; therefore, a detailed examination of heart function following successful catheter ablation is essential to identify these features.* -
- Results show that out of 41 participants, 82.9% recovered LVEF post-ablation, yet many still had signs of heart dysfunction, with significant portions exhibiting elevated NT-proBNP levels, ongoing heart failure symptoms, and impaired heart performance despite normalization of LVEF.*
Cardiovascular and Respiratory Measures in Adults With Early-onset Type 2 Diabetes Mellitus Compared With Matched Controls.
Can J Diabetes
November 2024
Faculty of Medicine and Health, The University of Sydney, Camperdown, New South Wales, Australia.
Article Synopsis
- - The study aimed to compare heart and lung function at rest in people with early-onset type 2 diabetes and a matching control group without diabetes, focusing on age, sex, and body mass index (BMI).
- - Eighteen participants with early-onset type 2 diabetes and fourteen controls underwent tests including echocardiography and pulmonary function, along with blood sample analyses for various biomarkers.
- - Results showed that those with early-onset diabetes had significant differences in heart function, including worse left ventricular diastolic function and lower lung diffusing capacity compared to controls.
Exercise limitations in amyloid cardiomyopathy assessed by cardiopulmonary exercise testing-A multicentre study.
ESC Heart Fail
November 2024
Centro Cardiologico Monzino, IRCCS, Milan, Italy.
Aims: Amyloid cardiomyopathy is caused by the deposition of light chain (AL) or transthyretin amyloid (ATTR) fibrils, that leads to a restrictive cardiomyopathy, often resulting in heart failure (HF) with preserved or reduced ejection fraction. This study aimed to determine whether cardiac output reduction or ventilation inefficiency plays a predominant role in limiting exercise in patients with amyloid cardiomyopathy.
Methods: We conducted a multicentre prospective study in patients with AL or ATTR cardiomyopathy who underwent cardiopulmonary exercise testing across four centres.
Ancient and modern bone diagnosis: Towards a better understanding of chemical and structural feature alterations.
Spectrochim Acta A Mol Biomol Spectrosc
February 2025
Centre of Physics of Minho and Porto Universities (CF-UM-PT), University of Minho, 4804-058 Guimarães, Portugal.
Chemical and structural alterations hold great importance in the field of diagenesis. Attenuated Total Reflectance - Fourier Transform Infrared Spectroscopy (ATR-FTIR) is a valuable method for examining bio-apatite composition changes. Infrared spectroscopy (IR) and X-ray diffraction (XRD) were employed to analyze both modern and archaeological bone specimens.
View Article and Find Full Text PDFStudy on Pore Water Pressure Model of EICP-Solidified Sand under Cyclic Loading.
Materials (Basel)
September 2024
Shaanxi Key Laboratory of Safety and Durability of Concrete Structures, Xijing University, Xi'an 710123, China.
Article Synopsis
- Saturated sand foundations can experience liquefaction under various loads, making foundation reinforcement crucial for stability and resistance.
- Traditional methods of foundation treatment have drawbacks such as high costs, lengthy construction times, and negative environmental impacts, while enzyme-induced calcium carbonate precipitation (EICP) offers a more sustainable and cost-effective alternative.
- Experimental tests on EICP-treated sand revealed factors like confining pressure and cyclic stress influence pore water pressure and liquefaction resistance, leading to the establishment of a predictive model for pore water pressure behavior, which could help in preventing sand liquefaction.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!