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- W2019900069 abstract "Les substituts osseux phosphocalciques sont de plus en plus utilisés en thérapeutique humaine du fait de leur sécurité microbiologique et de leur efficacité. Cependant, la variété de leur mode de synthèse conduit à faire coexister sur le marché des produits qui ne sont pas génériques au sens strict du terme. Par ailleurs, il n'existe pas de normes et d'études cliniques permettant de comparer ces produits. L'objectif de ce travail a été de comparer avec les mêmes méthodes d'analyse 14 substituts osseux commerciaux sous forme de bloc et de poudre. Les résultats obtenus sur les matériaux, par diffraction des rayons X et spectroscopie infrarouge, montrent des compositions chimiques voisines et conformes aux spécifications des fabricants. Des impuretés minérales ont cependant été détectées dans quelques matériaux. La porosité, déterminée par microscopie électronique à balayage, montre une absence de macroporosité pour certains matériaux (porosité < 30 %). Une grande disparité a été observée entre les autres substituts (30 % < porosité < 60 %). Les mesures de limite élastique, réalisées par indentation, montrent l'existence de trois groupes de matériaux (< 10 MPa, entre 30 et 40 MPa > 100 Mpa). Enfin aucune corrélation n'a été observée entre la composition chimique des biomatériaux et leur dissolution. Ce travail a permis de comparer, par les mêmes méthodes, les caractéristiques essentielles des substituts osseux, composition chimique, résistance à la compression, porosité et propriétés de dissolution. Ces déterminations sont essentielles pour comprendre les paramètres susceptibles d'influer sur leur bioactivité. Bone substitutes are more and more used in bone surgery for their biologic safety, clinic efficiency and facility to synthesize. However many devices are actually marketed which are not similar according to their theoretical composition. We did not find any comparative physicochemical or clinical study which allows to evaluate them. The aim of this study is to compare with the same analysis methods the physicochemical properties of 14 marketed materials (blocs and granules). X-ray diffraction and infrared spectroscopy were used for components determination. Secondary electron microscopy (SEM) was performed for porosity measurements and micro-indentation method was applied to determine the elastic limits. At last a dissolution test was performed. The results have shown that the composition is likely those claimed by manufacturers excepted for one material. However mineral impurities were detected in some substitutes. All materials are not macroporous (some of them have macroporosity less than 30%). Moreover we observed a large diversity between materials (macroporosity comprised between 30 and 60%). Micro-indentation method allowed to characterize three groups of substitutes (elastic limit lower than 10 MPa, comprised between 30 and 40 MPa, upper 100 MPA). Results from dissolution experiments did not show any correlation with theoretical composition. This study shows that all materials have a nearby composition. The macroporosity and mechanical properties are not similar according the several studied substitutes. However these last properties have a great influence on the osseous integration and it would be on interest to perform some clinical comparative study with these bone substitutes." @default.
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- W2019900069 date "2005-10-01" @default.
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- W2019900069 title "Étude comparative des caractéristiques physicochimiques de substituts osseux phosphocalciques" @default.
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- W2019900069 doi "https://doi.org/10.1016/j.rbmret.2005.10.002" @default.
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