The Model for Regeneration Guided by Membrane (RTG) from TRUE line is made of polyurethane - material very similar to natural human bone type 2, used for studies and surgical practices, and can be cut and drilled. It enables the professional who uses it to have a training very close to the real, improving techniques with respect to Bioethics. The holder allows you to make all the necessary mouth opening, tipping and closing movements for the student to work with both hands as in the real patient. Mandible and maxilla coated with soft tissue material. Maxillary sinus with flexible membrane.