A heat sink for a dental light-curing device comprises three mounting surfaces that are each configured for mounting a light source, such as an LED or LED array, which is capable of generating light suitable for curing light-curable compounds. One method of the present invention includes immobilizing a biomolecule comprising an unsubstituted amide moiety on a biomaterial surface. It can thereby be determined whether the test substance is a modulator of GPR 17 activity. The sensing arrangement may include a pressurized air outlet and an adjacent pressure measuring channel connected to a pressure sensor to sense the back pressure created by a passing bearing. Activity states of each device interface are controlled based on at least one of the device information, the interface information, the mate device information, and the mate interface information.