“…Different materials like dental stone, 12 cellophane‐wrapped asbestos, 13 silicone putty, 2,14 light‐body coated gauze, 9 salt, 15 modelling clay, 16 caramel, 17 thermocol, 18 and glycerine soap 19 have been used as 3D spacers and are retrieved after processing to produce a hollow cavity. A photopolymer resin (Dental SG resin, Formlabs Inc, USA) containing methacrylic ester and photoinitiator is specifically manufactured for printing 3D parts for use as surgical guides among other applications 20…”