*4.3.11 Cements*

Cement is used clinically due to its injection capability and molding as a paste and filling the irregular bone defects in a minimally invasive manner [97]. The Cement is obtained by mixing biomaterial powder with a liquid that can be set when injected into the defect site [98]. Polymethyl methacrylate is one of the common cement to repair bone defects [99]. Jia et al. [100] demonstrated the positive application of antibiotic PMMA cement (0.5 g of gentamicin per 40 g of PMMA) coating on the locking plates for infection inhabitation and enhancing bone regeneration. On the other hand, self-setting calcium phosphate is the other common type of cement with a lot of applications. These cements provide injectibility with favorable bone defectfilling capability [101].
