BONE REGENERATION: IN VITRO EVALUATION OF THE BEHAVIOUR OF OSTEOBLAST-LIKE MG63 CELLS PLACED IN CONTACT WITH POLYLACTIC-CO-GLYCOLIC ACID, DEPROTEINIZED BOVINE BONE AND DEMINERALIZED FREEZE-DRIED BONE ALLOGRAFT

Insufficient bone density of the alveolar crests, caused by loss of the dental elements, sometimes impedes the primary stability of an integrated bone implant. The techniques of bone regeneration allow to obtain a sufficient quantity of alveolar bone to permit the implant rehabilitation of the edentulous crests. Today several grafting materials are available and they bave different characteristics, according to their structure, which intluence the different behaviour of the grafting materials to the bone and the implant surface.The aim ofthis study is to evaluate the interaction between a human osteosarcoma MG63 celi line and three different biomaterials: polylactic-co-glycolic acid (PLAGA), deproteinized bovine bone and demineralised freeze-dried bone allograft (DFDBA). From this study a different behaviour emerges of the osteoblast-like MG63 cells in relation to the sublayer on which these cells were placed in culture. The results of the study, in fact, demonstrate that the most osteoconductive material of the three analysed is the DFDBA, followed by DPBB. On the contrary, the PLGA, because of its roughness, does not seem to represent a valid support for ceU growth, and does not encourage any morphologic modification in tumoral cells. Furthermore, deproteinized bovine bone shows a differentiating effect which could lead to hypothesise an osteoconductive capacity of this biomaterial. Further studies should be carried out with the aim of explaining the results obtained.