In Vitro Physico-Chemical Characterization and Standardized In Vivo Evaluation of Biocompatibility of a New Synthetic Membrane for Guided Bone Regeneration

This study's aim was to evaluate the biocompatibility and bioabsorption of a new membrane for guided bone regeneration (polylactic-co-glycolic acid associated with hydroxyapatite and -tricalcium phosphate) with three thicknesses (200, 500, and 700 mu m) implanted in mice subcutaneously. Scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and the quantification of carbon, hydrogen and nitrogen were used to characterize the physico-chemical properties. One hundred Balb-C mice were divided into 5 experimental groups: Group 1Sham (without implantation); Group 2200 m; Group 3500 m; Group 4700 m; and Group 5Pratix((R)). Each group was subdivided into four experimental periods (7, 30, 60 and 90 days). Samples were collected and processed for histological and histomorphometrical evaluation. The membranes showed no moderate or severe tissue reactions during the experimental periods studied. The 500-m membrane showed no tissue reaction during any experimental period. The 200-m membrane began to exhibit fragmentation after 30 days, while the 500-m and 700-mu m membranes began fragmentation at 90 days. All membranes studied were biocompatible and the 500 mu m membrane showed the best results for absorption and tissue reaction, indicating its potential for clinical guided bone regeneration.