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Structural and chemical features of xenograft bone substitutes: A systematic review of in vitro studies
Biotechnology and Applied Biochemistry ( IF 3.2 ) Pub Date : 2020-11-01 , DOI: 10.1002/bab.2065
Reza Amid 1, 2 , Aida Kheiri 3 , Lida Kheiri 4 , Mahdi Kadkhodazadeh 1 , Mehdi Ekhlasmandkermani 2
Affiliation  

Xenograft bone substitutes are obtained from different species and prepared by various procedures including heat treatment, hydrazine, and chemical and hydrothermal methods. These grafts are utilized widely because of similar structure and properties to human bone, proper bone formation, and biocompatibility. The aim of this systematic review was to evaluate different xenografts from structural and chemical aspects. In vitro studies published in English language, which assessed xenografts’ features, met the inclusion criteria. Electronic search of four databases including PubMed, Google Scholar, Scopus, and Web of Science and a hand search until September 2020 were performed. The irrelevant studies were the ones which focused on cell adhesion and effect of growth factors. Finally, 25 studies were included in the review. Nineteen studies used bovine xenografts, and 12 studies applied heat treatment as their preparation method. Particles showed various morphologies, and their largest size was observed at 5 mm. From 18 studies, it is found that the smallest pore size was 1.3 µm and the highest pore size was 1000 µm. There is large heterogeneity of porosity, crystallinity, Ca/P ratio, and osteogenesis based on the preparation method. Proper porosity and the connection between pores affect bone regeneration. Therefore, biomaterial selection and outcomes evaluation should be interpreted separately.

中文翻译:

异种移植骨替代物的结构和化学特征:体外研究的系统评价

异种移植骨替代物取自不同物种,并通过各种程序制备,包括热处理、肼、化学和水热方法。由于与人体骨骼相似的结构和特性、适当的骨形成和生物相容性,这些移植物被广泛使用。本系统评价的目的是从结构和化学方面评估不同的异种移植物。体外以英语发表的评估异种移植物特征的研究符合纳入标准。对包括 PubMed、Google Scholar、Scopus 和 Web of Science 在内的四个数据库进行了电子搜索,并在 2020 年 9 月之前进行了手动搜索。不相关的研究集中在细胞粘附和生长因子的影响上。最后,25 项研究被纳入评价。19 项研究使用牛异种移植物,12 项研究使用热处理作为其制备方法。颗粒表现出各种形态,最大尺寸为 5 mm。从 18 项研究中发现,最小孔径为 1.3 µm,最高孔径为 1000 µm。根据制备方法,孔隙率、结晶度、Ca/P比和成骨存在较大的异质性。适当的孔隙率和孔隙之间的连接会影响骨再生。因此,生物材料的选择和结果评估应分开解释。
更新日期:2020-11-01
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