The 3D printed plastic material that can kill 99% of bacteria could revolutionise dental implants Scientists from the University of Groningen in the Netherlands have invented a type of 3D printed plastic that can kill 99% of bacteria that touches it, which could pave the way for a multitude of medical, dental, food hygiene and child safety applications. The researchers took the dental resin polymers that are used to make artificial teeth implants and embedded antimicrobial quaternary ammonium salts inside the polymers. The salts are positively charged, which causes negatively charged bacterial membranes to burst and die. The polymer was then put into a 3D printer and used to print out a range of dental items, including replacement teeth implants and orthodontic braces, with the objects hardened using ultraviolet light. When the objects were coated in a mix of saliva and Streptococcus mutans, the bacterium that causes tooth decay, the researchers found that the new mat...