A combinatorial chemistry system allows for the dual processing of different molecules coated on a library of beads. A lens system reimages the defracted order beams onto a stationary phase grating. In some embodiments, the nodes are automatically drawn as labels instead of, or in addition to, the label-edges. In some embodiments, a combination of AC and DC test vectors maximize power transfer to expedite heating, and therefore testing. A method of use of said dental inserts is also described. More specifically, the invention relates to stabilized, pharmaceutically effective preparations of oxidation-sensitive therapeutic agents.