Multilayer PMMA CAD-CAM Discs by PoliDentMulti layered, pre coloured PMMA discs for making temporary crowns and bridges. A multi layered disc is composed of five shades of colour with gentle colour transitions that give it a natural look. All Polident discs offer excellent milling and polishing properties. They are made from higher quality material. During milling, they produce small chips that do not stick to the bur. This prevents the tool from overheating and breaking. One bur can be used