“…The uncontrolled release of growth factors has, in some instances, been related to an accelerated resorption of bone tissue and of the implant [122]. Since growth factors can stimulate the degradation as well as the formation of bone (depending on their local concentrations), they could impair the osteoconductivity of the coated implant surface [132]. Similarly, bisphosphonate (BP) molecules, by affecting bone remodeling, could also block the bone repair process: the drug at very high concentration could have detrimental effects on the fixation of the implant over longer periods of time.…”