Histo-morphologic characteristics of intra-osseous implants of WE43 Mg alloys with and without heat treatment in an in vivo cranial bone sheep model

Andrea Torroni, Chongchen Xiang, Lukasz Witek, Eduardo D Rodriguez, Roberto L Flores, Nikhil Gupta, Paulo G Coelho

Research output: Contribution to journalArticle

Abstract

WE43 Mg alloy, composed of Mg, Yttrium, Rare Earth elements, and Zirconium, has proved to be a suitable candidate for production of resorbable osteosynthesis implants in both clinical and experimental settings. In a previous study we tested biocompatibility and degradation properties of untreated (as-cast) and artificially aged (T-5) WE43 Mg-alloys as subperiosteal implants on a maxillofacial sheep model. Both the alloy compositions showed excellent biocompatibility, however, with respect to degradation rate, the as-cast form showed increased degradability compared with the T-5. In the present study, we tested the same alloy composition (i.e. as-cast and T-5) to assess their biological behavior and degradation pattern when implanted as endosteal implants on a calvarial bone sheep model. Six implants in form of cylindrical discs were tested in 6 sheep, one per composition of each disc was placed in two monocortical cranial defect created with high speed trephine bur in the parietal bone. After euthanasia at 6 weeks histomorphological analysis of the bone/implant specimens was performed. WE43-as cast showed higher degradation rate, increased bone remodeling, gas pockets formation and osteolysis compared with the T5 alloy. WE43-T5 showed greater bone/implant interface stability, and seemed to be more suitable for fabrication of endosteal bone screws.

Original languageEnglish (US)
JournalJournal of Cranio-Maxillo-Facial Surgery
DOIs
StateE-pub ahead of print - Jan 4 2018

Keywords

  • Journal Article

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