This document specifies the characteristics of polymer-based composite machinable blanks with respect to the milling process, and provides the test methods that address the clinical issues specific to those materials. In addition, it specifies the items to be described on the packaging and materials, as well as descriptions to be included in the instructions for use. The polymer-based composite machinable blanks that this document covered are blanks that are used for fabricating dental restorative appliances (e.g. single crowns or inlays) by milling processes. They do not include large-sized blanks (e.g. discs) that allow for fabrication of two or more units of crowns or bridges from one blank.