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Development and characterization of α-tricalcium phosphate/monocalcium aluminate composite bone cement

Journal of Biomedical Science and Engineering 2012年第8期5卷 448-456页

作者： loreley Morejón-Alonso raúl garcía carrodeguas luis Alberto dos Santos Ceramic Department Instituto de Cerámica y Vidrio-CSIC Madrid Spain Engineering School Materials Department Universidade Federal do Rio Grande do Sul Porto Alegre RS Brazil General Chemistry Department Chemistry Faculty Havana University Cuba

Calcium phosphate cements have received much attention in recent decades owing to their biocompatibility, in situ handling, and shaping abilities. However, their low initial mechanical strength is still a major limitation. On the other hand, calcium aluminate cements (CACs) set fast and have a high initial strength and good corrosion resistance in contact with body fluids, making them excellent dental restorative materials. Therefore, the chemical, mechanical and biological properties of new-TCP/CA cement after aging in simulated body fluid (SBF) were investigated. The results indicated that the composites have setting times not appropriated for immediate applications and have degradation rates higher than those of the traditional CPCs. Moreover, the compressive strength of composite was lower than 5MPa and did not increase with SBF immersion. However, the α-TCP/CA composites showed a higher bioactivity at early stages and were not only more biocompatible but also more noncytotoxic.

关键词： Calcium Phosphate Cements Calcium Aluminate Cements Hydroxyapatite In Vitro

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raman Spectroscopy Analysis of Wollastonite/Tricalcium Phosphate Glass-Ceramics after Implantation in Critical Bone Defect in rats

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Materials Sciences and Applications 2022年第5期13卷 317-333页

作者： Mauricio Mitsuo Monção Isabela Cerqueira Barreto Fúlvio Borges Miguel luiz Fernando Cappa De Oliveira raul garcia carrodeguas Roberto Paulo Correia De Araújo Department of Technology in Health and Biology Federal Institute of Education Science and Technology of Bahia Salvador Brazil laboratory of Tissue Bioengineering and Biomaterials Federal University of Bahia Salvador Brazil Nucleus for Spectroscopy and Molecular Structure Federal University of Juiz de Fora Juiz de Fora Brazil Noricum Sl San Sebastián de los Reyes Madrid Spain Institute of Health Sciences Federal University of Bahia Salvador Brazil

In this work wollastonite/tricalcium phosphate (W/TCP) glass-ceramics with three W/TCP weight ratios (20/80;60/40 and 80/20) were implanted in rat calvaria and the modifications taking place during implantation were studied by raman spectroscopy. The experimental glass-ceramics were composed of different contents of βW, αW, βTCP, αTCP, and glassy phases. Materials were implanted for 7-, 15-, 45- and 120-day periods after which the implanted materials were recovered and analyzed by FT-raman spectroscopy. The results suggested that the αW phase reabsorbs fast during implantation in the glass-ceramics 60/40 and 80/20, whereas βTCP and αTCP glass-ceramic are gradually attenuated and replaced by biological apatite-like bands. In the glass-ceramic 20/80, the bands related to the βTCP phase remained unvaried in all analyzed periods. New bands associated with the deposition of collagenous material appeared during implantation for all 60/40 and 80/20 glass-ceramics experimental groups, but important differences in intensities between both groups. The spectra corresponding to implants of 60/40 glass-ceramic at the 120-day period were very similar to those of the control group (normal cortical bone), with regards to raman shifts and intensities, as well as in the FWHM value of the 962 cm-1 apatite band (ν1 PO4 in hydroxyapatite), evidencing that apatite deposited at the implant site has the same crystallinity than biological apatite in normal bone mineral. The glass-ceramic 20/80 behaved just as an osteoconductive filling material, while glass-ceramics 60/40 and 80/20 were able to induce deposition of organic matrix mineralized new tissue. The 60/40 glass-ceramic showed the best performance and the most similar raman spectrum to normal cortical bone.

关键词： raman Spectroscopy Glass-Ceramics Wollastonite Tricalcium Phosphate

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放射学报告中随访影像检查的差异:病人、影像检查和放射科医生预测因素

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国际医学放射学杂志 2019年第4期 489-489页

作者：梁译丹 l.R.Cochon N.Kapoor E.carrodeguas I.K.Ip R.lacson G.Boland Department of radiology Brigham and Women's Hospital Harvard Medical School

摘要放射科医生在提出有关额外成像和相关因素的建议时的差异是未知的。清楚地识别导致后续建议变化的因素可以防止对偶然或模糊的影像发现进行不必要的检查。目的

关键词：放射科医生影像检查预测因素放射学

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