It seems you're asking about dental materials and possibly their composition or details related to a specific topic. Could you clarify what you mean by "sub tract"? For example:
- Are you looking for an outline of dental materials and their properties?
- Do you want information on how specific dental materials are manufactured or processed?
- Are you asking about the subtraction or removal of materials in a dental context (e.g., cavity preparation or CAD/CAM milling)?
- Something else entirely?
