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Effect of the structure of poly(glycol monomethacrylate) gel on the calcification of implants

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Abstract

The effect of the physical structure and chemical modification of poly(glycol monomethacrylate) gels on the calcification of test implants has been studied. While the chemical modification of the poly(glycol monomethacrylate) backbone by the introduction of ionogenic groups did not affect the process of calcification, there was a substantial effect of the physical structure of the polymer, as determined by the monomer: water ratio, on the process of calcification of the implants. Homogenous and microporous gels showed calcification in the margin of the implant only exceptionally; in macroporous gels calcification occurred massively in the margin of the implant and in the case of a higher porosity in its centre. This phenomenon has been explained by the different degree to which the implant is penetrated by the newly formed tissue, as well as by the difference in accessibility of nutrition to the penetrating cells depending on the porosity of the implant.

Abstract

L'effet de la structure physique et des modification chimiques de gels de poly(glycol monométhacrylate) sur la calcification d'implants tests a été étudié. Alors que les modifications chimiques du poly(glycol monométhacrylate) osseux, obtenu par introduction de groupes formateurs d'ions, n'affectent pas le processus de calcification, on observe un effet net de la structure physique du polymère par action du rapport monomère: eau sur le processus de calcification des implants. Des gels homogènes et microporeux montrent rarement une calcification autor de l'implant; dans les gels macroporeux, la calcification s'observe massivement autour de l'implant, en cas de porosité élevée en son centre. Ce phénomène a été expliqué par la pénétration diverse par du tissu néoformé ainsi que par la possibilité de pénétration d'éléments nutritifs cellulaires, liée à la porosité de l'implant.

Zusammenfassung

Die Wirkung der physikalischen Struktur und der chemischen Veränderung von Poly-(Glycol-Monomethacrylat)-Gelen auf die Verkalkung von Implantat-Proben wurde untersucht. Die chemische Veränderung der Poly(Glycol-Monomethacrylat)-Grundstruktur, hervorgerufen durch das Beifügen ionogener Gruppen, hatte auf den Verkalkungsprozeß keine Wirkung; die physikalische Struktur des Polymers hingegen hatte eine markante Wirkung auf den Verkalkungsprozeß der Implantate, welche durch das Verhältnis Monomer: Wasser bestimmt wurde. Homogene und kleinporöse Gele zeigten ganz ausnahmsweise eine Verkalkung am Rande des Implantats; in großporösen Gelen erfolgte massive Verkalkung am Rande des Implantats, bei höherer Porosität in dessen Zentrum. Dieses Phänomen wird zurückgeführt auf den unterschiedlichen Grad, in welchem das neu gebildete Gewebe das Implantat durchdringt und auf die verschiedene Zugänglichkeit der Nahrung der eindringenden Zellen, welche von der Porosität des Implantats abhängt.

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Šprincl, L., Kopeček, J. & Lím, D. Effect of the structure of poly(glycol monomethacrylate) gel on the calcification of implants. Calc. Tis Res. 13, 63–72 (1973). https://doi.org/10.1007/BF02015397

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  • DOI: https://doi.org/10.1007/BF02015397

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