INTRODUCTION
Poly-D,L-Lactic Acid (PDLLA) is a new biodegradable and biocompatible semi-crystalline polymer, composed of a 50/50 mixture of D and L-isomers of polylactic acid. It has been used either as a vehicle for drug delivery, or in dentistry and in craniomaxillofacial surgery for bone regeneration and tissue engineering (pe. refining the facial contours after traumatic injuries).1 Its peculiar characteristics are represented by an extended resorption time and by unique physical and mechanical properties: it is prepared on the operating table as a malleable material that can be adjusted to the surgical needs and that solidifies after a few minutes, becoming suitable to screw fixation to the skull.1